Download 21-60 Heating/Air Conditioning

07/05/09 16:39:25 61SJC020_210_0001
SUPPLEMENTAL RESTRAINT SYSTEM (SRS) (If HVAC maintenance is required)
The Ridgeline SRS includes a driver’s airbag in the steering wheel hub, a passenger’s airbag in the dashboard above
the glove box, seat belt tensioners in the front seat belt retractors, side curtain airbags in the sides of the roof, and side
airbags in the front seat-backs. Information necessary to safely service the SRS is included in this Service Manual.
Items marked with an asterisk ( ) on the contents page include or are located near SRS components. Servicing,
disassembling, or replacing these items requires special precautions and tools, and should be done by an authorized
Honda dealer.
• To avoid rendering the SRS inoperative, which could lead to personal injury or death in the event of a severe frontal
or side collision, all SRS service work should be done by an authorized Honda dealer.
• Improper service procedures, including incorrect removal and installation of the SRS, could lead to personal injury
caused by unintentional deployment of the airbags and/or side airbags.
• Do not bump or impact the SRS unit, front impact sensors, or side impact sensors when the ignition switch is ON (II),
or for at least 3 minutes after the ignition switch is turned OFF; otherwise, the system may fail in a collision, or the
airbags may deploy.
• SRS electrical connectors are identified by yellow color coding. Related components are located in the steering
column, front console, dashboard, dashboard lower panel, in the dashboard above the glove box, in the front seats,
in the roof side, and around the floor. Do not use electrical test equipment on these circuits.
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07/05/09 16:39:25 61SJC020_210_0002
HVAC (Heating, Ventilation, and Air Conditioning)
HVAC (Heating, Ventilation, and Air
Conditioning)
Special Tools ................................................... 21-2
Heating/Air Conditioning
Component Location Index ........................... 21-3
A/C Service Tips and Precautions ................. 21-6
A/C Refrigerant Oil Replacement .................. 21-6
A/C Line Replacement .................................... 21-7
General Troubleshooting Information ......... 21-8
DTC Troubleshooting Index .......................... 21-11
Symptom Troubleshooting Index ................. 21-12
System Description ........................................ 21-13
Circuit Diagram ............................................... 21-18
DTC Troubleshooting ..................................... 21-20
Recirculation Control Motor
Circuit Troubleshooting ............................. 21-37
HVAC Control Power and Ground
Circuit Troubleshooting ............................. 21-39
Radiator and A/C Condenser Fan Low Speed
Circuit Troubleshooting ............................. 21-40
A/C Condenser Fan High Speed
Circuit Troubleshooting ............................. 21-44
Radiator and A/C Condenser Fan High Speed
Circuit Troubleshooting ............................. 21-46
A/C Compressor Clutch
Circuit Troubleshooting ............................. 21-47
A/C Pressure Switch
Circuit Troubleshooting ............................. 21-49
Outside Air Temperature Sensor Test ......... 21-52
Outside Air Temperature Sensor
Replacement ............................................... 21-52
Evaporator Temperature Sensor Test .......... 21-53
Evaporator Temperature Sensor
Replacement ............................................... 21-53
Power Transistor Test .................................... 21-54
Air Mix Control Motor Test ............................ 21-55
Air Mix Control Motor Replacement ............ 21-55
Mode Control Motor Test .............................. 21-56
Mode Control Motor Replacement ............... 21-56
Recirculation Control Motor Test .................. 21-57
Recirculation Control Motor
Replacement ............................................... 21-57
HVAC Control Unit Removal/Installation ..... 21-58
Dust and Pollen Filter Replacement ............. 21-58
Blower Unit Removal/Installation ................. 21-59
Blower Unit Component Replacement ........ 21-60
Evaporator Core Replacement ...................... 21-60
Heater Unit/Core Replacement ..................... 21-62
Heater Valve Cable Adjustment .................... 21-65
A/C Compressor Replacement ...................... 21-66
A/C Compressor Clutch Check ...................... 21-68
A/C Compressor Clutch Overhaul ................. 21-69
A/C Compressor Relief Valve
Replacement ............................................... 21-70
A/C Condenser Replacement ........................ 21-70
Receiver/Dryer Desiccant Replacement ....... 21-72
Refrigerant Recovery ..................................... 21-73
System Evacuation ........................................ 21-74
System Charging ............................................ 21-75
Refrigerant Leak Test ..................................... 21-76
A/C System Test ............................................. 21-77
Climate Control
Component Location Index ...........................
General Troubleshooting Information .........
DTC Troubleshooting Index ..........................
Symptom Troubleshooting Index .................
System Description ........................................
Circuit Diagram ...............................................
DTC Troubleshooting .....................................
Recirculation Control Motor Circuit
Troubleshooting .........................................
Navigation Communication Line Circuit
Troubleshooting .........................................
Climate Control Power and Ground
Circuit Troubleshooting .............................
A/C Pressure Switch Circuit
Troubleshooting .........................................
In-car Temperature Sensor Test ...................
In-car Temperature Sensor Replacement ....
Sunlight Sensor Test ......................................
Sunlight Sensor Replacement ......................
Driver’s Air Mix Control Motor Test .............
Driver’s Air Mix Control Motor
Replacement ...............................................
Passenger’s Air Mix Control Motor Test ......
Passenger’s Air Mix Control Motor
Replacement ...............................................
Climate Control Unit
Removal/Installation ..................................
21-80
21-83
21-88
21-89
21-90
21-98
21-100
21-126
21-128
21-129
21-130
21-133
21-133
21-134
21-134
21-135
21-135
21-136
21-137
21-137
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07/05/09 16:39:26 61SJC020_210_0003
HVAC (Heating, Ventilation, and Air Conditioning)
Special Tools
Ref. No.
Tool Number
07SAZ-001000A
０１
21-2
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Description
Backprobe Set
Qty
2
07/05/09 16:39:27 61SJC020_210_0004
Heating/Air Conditioning
Component Location Index
＊０１
EVAPORATOR CORE
(Located-in the heater unit)
Replacement, page 21-60
SERVICE VALVE
(LOW-PRESSURE SIDE)
SERVICE VALVE
(HIGH-PRESSURE SIDE)
RECEIVER/DRYER DESICCANT
Replacement, page 21-72
A/C CONDENSER
Replacement, page 21-70
A/C COMPRESSOR
Replacement, page 21-66
Clutch Check, page 21-68
Clutch Overhaul, page 21-69
(cont’d)
21-3
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07/05/09 16:39:30 61SJC020_210_0005
Heating/Air Conditioning
Component Location Index (cont’d)
＊０２
UNDER-HOOD FUSE/RELAY BOX
A/C COMPRESSOR CLUTCH RELAY
Test, page 22-75
BLOWER MOTOR RELAY
Test, page 22-75
AUXILIARY UNDER-HOOD RELAY BOX
A/C CONDENSER FAN RELAY
Test, page 22-75
RADIATOR FAN RELAY
Test, page 22-75
FAN CONTROL RELAY
Test, page 22-75
OUTSIDE AIR
TEMPERATURE SENSOR
Test, page 21-52
Replacement, page 21-52
RADIATOR FAN
A/C DIODE
PCM
A/C CONDENSER FAN
(Located under-dash,
taped to harness)
A/C PRESSURE SWITCH
21-4
07/05/09 16:39:33 61SJC020_210_0006
＊０３
HEATER VALVE CABLE
Adjustment, page 21-65
HEATER UNIT/CORE
Replacement, page 21-62
EVAPORATOR CORE
(Located-in the heater unit)
Replacement, page 21-60
MODE CONTROL MOTOR
Test, page 21-56
Replacement, page 21-56
BLOWER UNIT
Removal/Installation,
page 21-59
Component Replacement,
page 21-60
DUST AND POLLEN
FILTER
Replacement,
page 21-58
RECIRCULATION CONTROL MOTOR
Test, page 21-57
Replacement, page 21-57
AIR MIX CONTROL MOTOR
Test, page 21-55
Replacement, page 21-55
HVAC CONTROL UNIT
Removal/Installation, page 21-58
POWER TRANSISTOR
Test, page 21-54
EVAPORATOR TEMPERATURE SENSOR
Test, page 21-53
Replacement, page 21-53
21-5
07/05/09 16:39:33 61SJC020_210_0007
Heating/Air Conditioning
A/C Service Tips and Precautions
A/C Refrigerant Oil Replacement
Recommended PAG oil: DENSO ND-OIL 8
• Compressed air mixed with the R-134a forms a
combustible vapor.
• The vapor can burn or explode causing serious
injury.
• Never use compressed air to pressure test
R-134a service equipment or vehicle air
conditioning systems.
• Air conditioning refrigerant or lubricant vapor
can irritate your eyes, nose, or throat.
• Be careful when connecting service equipment.
• Do not breathe refrigerant or vapor.
The air conditioning system uses HFC-134a (R-134a)
refrigerant and polyalkyleneglycol (PAG) refrigerant oil,
which are not compatible with CFC-12 (R-12) refrigerant
and mineral oil. Do not use R-12 refrigerant or mineral
oil in this system, and do not attempt to use R-12
servicing equipment; damage to the air conditioning
system or your servicing equipment will result.
Use only service equipment that is U.L.-listed and is
certified to meet the requirements of SAE J2210 to
remove R-134a from the air conditioning system.
If accidental system discharge occurs, ventilate the
work area before resuming service.
• P/N 38897-PR7-A01AH: 120 mL (4 fl·oz)
• P/N 38899-PR7-A01: 40 mL (1 1/3 fl·oz)
Add the recommended refrigerant oil in the amount
listed if you replace any of the following parts.
• To avoid contamination, do not return the oil to the
container once dispensed, and never mix it with other
refrigerant oils.
• Immediately after using the oil, reinstall the cap on
the container, and seal it to avoid moisture
absorption.
• Do not spill the refrigerant oil on the vehicle; it may
damage the paint; if it gets on the paint, wash it off
immediately.
A/C condenser .........45 mL (1 1/2 fl·oz)
Evaporator ...............45 mL (1 1/2 fl·oz)
Line or hose .............10 mL (1/3 fl·oz)
Leakage repair .........25 mL (5/6 fl·oz)
A/C compressor .......For A/C compressor replacement,
subtract the volume of oil drained
from the removed A/C
compressor from 180 mL (6 fl·oz),
and drain the calculated volume
of oil from the new A/C
compressor: 180 mL (6 fl·oz) −
Volume of removed A/C
compressor = Volume to drain
from new A/C compressor.
NOTE: Even if no oil is drained
from the removed A/C
compressor, don’t drain more
than 50 mL (1 2/3 fl·oz) from the
new A/C compressor.
R-134a service equipment or vehicle air conditioning
systems should not be pressure tested or leak tested
with compressed air.
Additional health and safety information may be
obtained from the refrigerant and lubricant
manufacturers.
• Always disconnect the negative cable from the
battery whenever replacing air conditioning parts.
• Keep moisture and dirt out of the system. When
disconnecting any lines, plug or cap the fittings
immediately; don’t remove the caps or plugs until
just before you reconnect each line.
• Before connecting any hose or line, apply a few drops
of refrigerant oil to the O-ring.
• When tightening or loosening a fitting, use a second
wrench to support the matching fitting.
• When discharging the system, use an R-134a
refrigerant recovery/recycling/charging station; don’t
release refrigerant into the atmosphere.
REMOVED
A/C COMPRESSOR
SAME LEVEL
０１
NEW
A/C COMPRESSOR
DRAINING
VOLUME
:A
A: 180 mL (6 fl·oz)
21-6
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07/05/09 16:39:34 61SJC020_210_0008
A/C Line Replacement
０１
SUCTION HOSE
SUCTION LINE
A/C PRESSURE SWITCH
RECEIVER LINE A
RECEIVER LINE B
A/C CONDENSER
DISCHARGE HOSE
A/C COMPRESSOR
BRACKET
A/C COMPRESSOR
Discharge hose to the A/C compressor (6 x 1.0 mm): 9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
Discharge hose to the A/C condenser (6 x 1.0 mm): 9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
Receiver line B to the A/C condenser (6 x 1.0 mm): 9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
Receiver line A to the receiver line B (16 x 1.5 mm): 13.2 N·m (1.4 kgf·m, 9.8 lbf·ft)
A/C pressure switch to receiver line A (11 x 1.0 mm): 9.3 N·m (0.9 kgf·m, 6.9 lbf·ft)
Receiver line A to the evaporator (6 x 1.0 mm): 9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
Suction line to the evaporator (6 x 1.0 mm): 9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
Suction line to the suction hose (24 x 1.5 mm): 31.9 N·m (3.3 kgf·m, 23.5 lbf·ft)
Suction hose to the A/C compressor (6 x 1.0 mm): 9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
A/C compressor to the A/C compressor bracket (8 x 1.25 mm): 22 N·m (2.2 kgf·m, 16 lbf·ft)
A/C compressor bracket to the engine block (10 x 1.25 mm): 44 N·m (4.5 kgf·m, 33 lbf·ft)
21-7
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07/05/09 16:39:35 61SJC020_210_0009
Heating/Air Conditioning
General Troubleshooting Information
How to Check for DTCs with the HDS
1. Make sure the ignition switch is OFF.
2. Connect the HDS to the data link connector (DLC) (A) located under the driver’s side of the dashboard.
０１
A
3. Turn the ignition switch ON (II).
4. Make sure the HDS communicates with the vehicle and the climate control unit. If it doesn’t, troubleshoot the DLC
circuit (see page 11-194).
5. Select HVAC/CLIMATE CONTROL in the BODY ELECTRICAL menu.
6. Select DTCs in the HVAC/CLIMATE CONTROL menu.
7. Check for DTCs. If any DTCs are indicated, write down the DTCs, then go to the indicated DTC troubleshooting. If
no DTCs are indicated, refer to symptom troubleshooting.
NOTE:
• After troubleshooting, clear the DTCs with the HDS.
• For specific operations, refer to the user’s manual that came with the HDS.
21-8
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07/05/09 16:39:35 61SJC020_210_0010
How to Use the Self-diagnostic Function without the HDS
The HVAC control unit has a self-diagnostic function for heating, ventilation, and air conditioning system. To run the
self-diagnostic function, do the following:
1. Turn the ignition switch OFF.
2. Set the fan control dial OFF, the temperature control dial on Max Cool.
3. Turn the ignition switch ON (II), and select the vent mode.
4. Press and hold the A/C button, then press the recirculation button five times within 10 seconds. Release the A/C
buttons; the recirculation indicator blinks two times, then the self-diagnostic begins.
• If there is any problem in the system after self-diagnostic is finished, the recirculation indicator will blink
Diagnostic Trouble Code (DTC) 1 through 10.
• If no DTCs are found, the indicator will not blink.
０２
FAN CONTROL DIAL
VENT
A/C BUTTON
TEMPERATURE CONTROL DIAL
RECIRCULATION CONTROL BUTTON
WINDSHIELD DEFROST INDICATOR
RECIRCULATION CONTROL INDICATOR
Example of DTC Indication Pattern (DTC 3)
０３
0.3 sec
0.3 sec
0.3 sec
Recirculation
indicator
comes on
Recirculation or
windshield defrost
indicator comes on
Recirculation
indicator
goes off
Recirculation or
windshield defrost
indicator goes off
1.5 sec
Self-diagnostic begin
0.3 sec
1.5 sec
Self-diagnostic finished
Canceling the Self-diagnostic Function
5. Turn the ignition switch OFF to cancel the self-diagnostic function. After completing repair work, run the selfdiagnostic function again to make sure that there are no other malfunctions.
Max Cool Position Function
When the mode control button is in the MAX A/C position, the HVAC control unit will automatically select the
recirculation mode and turn the A/C on. The recirculation switch and A/C switch are disabled and cannot be turned off
in this mode. If the HVAC control unit fails to function as described, replace it.
(cont’d)
21-9
07/05/09 16:39:35 61SJC020_210_0011
Heating/Air Conditioning
General Troubleshooting Information (cont’d)
DTC (Recirculation
Indicator Blinks)
1
2
3
4
5
6
9
10
DTC (Windshield Defrost
Indicator Blinks)
7
8
Detection Item
An open in the air mix control motor circuit (see page 21-26)
A short in the air mix control motor circuit (see page 21-27)
A problem in the air mix control linkage, door, or motor (see page 21-28)
An open or short in the mode control motor circuit (see page 21-30)
A problem in the mode control linkage, doors, or motor (see page 21-32)
A problem in the blower motor circuit (see page 21-33)
An open in the outside temperature sensor circuit (see page 21-21)
A short in the outside temperature sensor circuit (see page 21-22)
Detection Item
An open in the evaporator temperature sensor circuit (see page 21-23)
A short in the evaporator temperature sensor circuit (see page 21-25)
In case of multiple problems, the recirculation indicator will indicate only the DTC with the least number of blinks.
21-10
07/05/09 16:39:35 61SJC020_210_0012
DTC Troubleshooting Index
Checking the DTCs by HDS
DTC
Detection Item or Symptom
B1200
Communication bus line error
B1202
HVAC control unit internal error
B1205
B1233
HVAC control unit lost communication
with gauge control module
(VSP/NE message)
HVAC control unit lost communication
with gauge control module (ECT message)
HVAC control unit lost communication
with gauge control module
(ILLUMI message)
An open in the outside air temperature
sensor circuit
A short in the outside air temperature
sensor circuit
An open in the evaporator temperature
sensor circuit
A short in the evaporator temperature
sensor circuit
An open in the air mix control motor circuit
B1234
A short in the air mix control motor circuit
B1235
A problem in the air mix control linkage,
door, or motor
An open or short in the mode control
motor circuit
A problem in the mode control linkage,
doors, or motor
A problem in the blower motor circuit
B1206
B1207
B1227
B1228
B1231
B1232
B1239
B1240
B1241
ECU
HVAC control
unit
HVAC control
unit
HVAC control
unit
DTC type
Loss of
communication
Internal error
page
(see page 22-110)
Loss of
communication
(see page 21-20)
HVAC control
unit
HVAC control
unit
Loss of
communication
Loss of
communication
(see page 21-20)
HVAC control
unit
HVAC control
unit
HVAC control
unit
HVAC control
unit
HVAC control
unit
HVAC control
unit
HVAC control
unit
HVAC control
unit
HVAC control
unit
HVAC control
unit
Signal error
(see page 21-21)
Signal error
(see page 21-22)
Signal error
(see page 21-23)
Signal error
(see page 21-25)
Signal error
(see page 21-26)
Signal error
(see page 21-27)
Signal error
(see page 21-28)
Signal error
(see page 21-30)
Signal error
(see page 21-32)
Signal error
(see page 21-33)
(see page 21-20)
(see page 21-20)
21-11
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07/05/09 16:39:36 61SJC020_210_0013
Heating/Air Conditioning
Symptom Troubleshooting Index
Symptom
Recirculation control doors do not
change between Fresh and
Recirculate
Diagnostic procedure
Recirculation control motor circuit
troubleshooting (see page 21-37)
Blower, heater controls, and A/C
do not work
HVAC control power and ground circuit
troubleshooting (see page 21-39)
Both fans do not run at low speed
with the A/C on (but the A/C
compressor runs with the A/C on)
Radiator and A/C condenser fan low speed circuit
troubleshooting (see page 21-40)
The A/C condenser fan does not
run at high speed (but both fans
run at low speed and the A/C
compressor operates with the A/C
on)
Both fans do not run at high speed
with the A/C on (but both fans run
at low speed and the A/C
compressor operates with the A/C
on)
Both fans run at high speed all the
time with the A/C on
A/C condenser fan high speed circuit
troubleshooting (see page 21-44)
The A/C compressor clutch does
not engage (but both fans run with
the A/C on)
A/C compressor clutch circuit troubleshooting
(see page 21-47)
A/C system does not come on
(both fans and the A/C
compressor do not work); heater
is OK
Blower fan runs slower than
expected in cold weather
A/C Pressure switch circuit troubleshooting
(see page 21-49)
HDS does not communicate with
the HVAC control unit or the
vehicle
Radiator and A/C condenser fan high speed
circuit troubleshooting (see page 21-46)
Radiator and A/C condenser fan high speed
circuit troubleshooting (see page 21-46)
ECT Troubleshooting: ECT sensor 2 circuit low
voltage (see page 11-149), ECT sensor 2 circuit
high voltage (see page 11-151)
NOTE: It is normal for the blower to run slowly
until the engine coolant temperature begins to
rise. If the blower continues to run slowly for an
abnormal length of time, continue to troubleshoot
the problem.
Troubleshoot the DLC (see page 11-194)
21-12
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Also check for
• HVAC DTCs (see page 21-8)
• Blown fuse No. 30 (7.5 A) in the under-dash
fuse/relay box
• Cleanliness and tightness of all terminals
• HVAC DTCs (see page 21-8)
• Blown fuse No. 30 (7.5 A) in the under-dash
fuse/relay box
• Poor ground at G402 (see page 22-68)
• Cleanliness and tightness of all terminals
• HVAC DTCs (see page 21-8)
• Blown fuse No. 20 (30 A) in the under-hood
fuse/relay box, and No. 30 (7.5 A) in the underdash fuse/relay box
• Poor ground at G201 (see page 22-68)
• Cleanliness and tightness of all terminals
• HVAC DTCs (see page 21-8)
• Blown fuse No. 30 (7.5 A) in the under-dash
fuse/relay box
• Poor ground at G201 (see page 22-68)
• Cleanliness and tightness of all terminals
• HVAC DTCs (see page 21-8)
• Poor ground at G202 (see page 22-68)
• Cleanliness and tightness of all terminals
•
•
•
•
•
•
•
•
•
•
•
•
HVAC DTCs (see page 21-8)
Poor ground at G202 (see page 22-68)
Cleanliness and tightness of all terminals
HVAC DTCs (see page 21-8)
Blower motor operation
Blown fuse No. 12 (7.5 A) in the under-hood
fuse/relay box, and No. 30 (7.5 A) in the driver’s
under-dash fuse/relay box
Cleanliness and tightness of all terminals
Body DTCs in B-CAN System Diagnosis Test
Mode A Troubleshooting (see page 22-99)
HVAC DTCs (see page 21-8)
Cleanliness and tightness of all terminals
Powertrain DTCs (see page 11-3)
Blower motor operation
07/05/09 16:39:36 61SJC020_210_0014
System Description
The air conditioning system removes heat from the passenger compartment by transferring heat from the ambient air
to the evaporator. The evaporator cools the air with the refrigerant that is circulating through the evaporator. The
refrigerant expands in the evaporator, and the evaporator becomes very cold and absorbs the heat from the ambient
air. The blower fan pushes air across the evaporator where the heat is absorbed, and then it blows the cool air into the
passenger compartment.
＊０１
EXPANSION VALVE
(Meters the required amount of
refrigerant into the evaporator)
BLOWER FAN
EVAPORATOR
(Absorption of heat)
EVAPORATOR TEMPERATURE
SENSOR
RELIEF VALVE
(Relieves pressure at the A/C compressor
when the pressure is too high)
A/C PRESSURE SWITCH
(Triple function)
When the refrigerant is below
196 kPa (2.0 kgf/cm2, 28 psi)
or above 3,140 kPa (32 kgf/c2m,
455 psi), the PCM turns the
compressor relay off to protect
the A/C compressor.
When the refrigerant is above
1,550 kPa (15.5 kgf/2cm, 225 psi),
the A/C pressure sensor
switches the radiator and
A/C condenser fans to
high speed.
A/C COMPRESSOR
(Suction and compression)
HIGH PRESSURE VAPOR
HIGH PRESSURE LIQUID
A/C CONDENSER
(Radiation of heat)
RECEIVER/DRYER
DESICCANT
(Traps debris, and
removes moisture)
LOW PRESSURE LIQUID
LOW PRESSURE VAPOR
This vehicle uses HFC-134a (R-134a) refrigerant, which does not contain chlorofluorocarbons. Pay attention to the
following service items:
• Do not mix refrigerants CFC-12 (R-12) and HFC-134a (R-134a). They are not compatible.
• Use only the recommended polyalkyleneglycol (PAG) refrigerant oil (DENSO ND-OIL 8) designed for the R-134a A/C
compressor. Intermixing the recommended (PAG) refrigerant oil with any other refrigerant oil will result in A/C
compressor failure.
• All A/C system parts (A/C compressor, discharge line, suction line, evaporator, A/C condenser, receiver/dryer,
expansion valve, O-rings for joints) are designed for refrigerant R-134a. Do not exchange with R-12 parts.
• Use a halogen gas leak detector designed for refrigerant R-134a.
• R-12 and R-134a refrigerant servicing equipment are not interchangeable. Use only a recovery/recycling/charging
station that is U.L.-listed and is certified to meet the requirements of SAE J2210 to service the R-134a air
conditioning systems.
• Always recover refrigerant R-134a with an approved recovery/recycling/charging station before disconnecting any
A/C fitting.
(cont’d)
21-13
ＳＪＣ８ＡＨ６Ｇ２４１００００００００ＣＡＡＴ１０
07/05/09 16:39:37 61SJC020_210_0015
Heating/Air Conditioning
System Description (cont’d)
A/C Pressure Switch
The A/C pressure switch consists of a high-low pressure switch (A/C pressure switch A) and a middle pressure switch
(A/C pressure switch B).
• High-low pressure switch
If the refrigerant pressure becomes too high (due to blockage or lack of airflow at the condenser), or too low (due to
leakage), the A/C pressure switch stops the A/C request signal to the PCM and the A/C compressor stops operating.
０２
590 kPa
(6.0 kgf/cm2, 86 psi)
29 kPa
(0.3 kgf/cm2, 4 psi)
ON
225 kPa
(2.3 kgf/cm2, 33 psi)
2,550 kPa
(26.0 kgf/cm2, 370 psi)
OFF
196 kPa
(2.0 kgf/cm2, 28 psi)
3,140 kPa
(32.0 kgf/cm2, 455 psi)
• Middle pressure switch
If the refrigerant pressure goes above 1,520 kPa (15.5 kgf/cm2, 221 psi), the A/C pressure switch closes to signal the
PCM to change the speed of the A/C condenser fan and radiator fan to high. When the refrigerant pressure drops
below 930 kPa (9.5 kgf/cm2, 135 psi), the A/C pressure switch opens to signal the PCM to change the speed of the A/C
condenser fan and radiator fan to low.
０３
590 kPa (6.0 kgf/cm2, 86 psi)
ON
1,520 kPa
(15.5 kgf/cm2, 221 psi)
OFF
930 kPa
(9.5 kgf/cm2, 135 psi)
HIGH-LOW
PRESSURE
SWITCH
MIDDLE
PRESSURE
SWITCH
21-14
07/05/09 16:39:37 61SJC020_210_0016
Heating/Air Conditioning Door Positions
０４
COOL
HOT
DEFROSTER
DOOR
(VENT)
AIR MIX
DOOR
HEAT/VENT
DOOR
(HEAT/VENT)
(HEAT)
(cont’d)
21-15
07/05/09 16:39:38 61SJC020_210_0017
Heating/Air Conditioning
System Description (cont’d)
０５
HOT
(HEAT/DEF)
(DEF)
21-16
COOL
07/05/09 16:39:38 61SJC020_210_0018
HVAC Control Unit Inputs and Outputs
０６
HVAC CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
Cavity
1
2
3
8
11
12
13
14
15
16
17
18
19
20
22
23
24
25
26
27
28
29
30
Wire color
BLK
RED/BLK
RED
PNK
LT BLU
YEL
GRN/RED
GRN/WHT
BLK/YEL
YEL/BLU
YEL/RED
GRN
PNK/BLU
RED/BLK
GRY
PNK/BLK
BRN
BLU/RED
BLU/YEL
YEL/GRN
WHT/BLU
RED/BLU
RED/YEL
Signal
GROUND (G402)
TAILLIGHT RELAY
GAUGE ASSEMBLY
OUTSIDE AIR TEMPERATURE SENSOR
B-CAN
A/C PRESSURE SWITCH
RECIRCULATE
FRESH
IG2 (Power)
MODE OFF
MODE VENT
AIR MIX COOL
AIR MIX HOT
SENSOR COMMON GROUND
AIR MIX POTENTIAL ＋5
AIR MIX POTENTIAL
EVAPORATOR TEMPERATURE SENSOR
BLOWER FEEDBACK
POWER TRANSISTOR CONTROL
MODE 4
MODE 3
MODE 2
MODE 1
OUTPUT
INPUT
OUTPUT
OUTPUT
INPUT/OUTPUT
INPUT
INPUT
INPUT
INPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
21-17
07/05/09 16:39:39 61SJC020_210_0019
Heating/Air Conditioning
Circuit Diagram
＊９０
UNDER−HOOD FUSE/RELAY BOX
BATTERY
No.22 (BAT) (120 A)
UNDER−DASH
FUSE/RELAY BOX
IGNITION SWITCH
No.23 (IG) (50 A)
BAT
G1
BLK/YEL
No.30 (7.5 A)
A4
N20
YEL
WHT
BLK/YEL
IG2
D7
BLK/YEL
IG2 HOT in ON (II)
No.23 (7.5 A)
PGM−FI
MAIN RELAY 1
D16
YEL/WHT
No.21 (40 A)
No.12 (7.5 A)
No.19 (30 A)
E7
A/C
COMPRESSOR
1 CLUTCH RELAY
No.20
(30 A)
D5
BLOWER
4 MOTOR RELAY
2
2
3
3
1
E9
F10
E15
E8
D1
BLK/YEL
BLU/RED
D2
YEL/GRN
4
RED
WHT/BLU
BLK
1
A/C
COMPRESSOR
CLUTCH
YEL
G202
YEL/WHT
2
2
A/C
CONDENSER
FAN MOTOR
A
1
1
BLU/YEL
BLU/YEL
4
BLU/YEL
WHT/RED
A14
A/C
DIODE
B
ACC L
5V
3
YEL
TW
C27
A/C
CONDENSER
1 FAN RELAY
1
4
RADIATOR
1 FAN RELAY
2
GRN
4
BLU/BLK
2
3
2
GRN/YEL
ENGINE COOLANT
TEMPERATURE
(ECT) SENSOR 2
4
TW2
AUXILIARY
UNDER−HOOD
RELAY BOX
3
ENGINE COOLANT
TEMPERATURE
(ECT) SENSOR 1
BLU/YEL
C14
FAN
CONTROL
5 RELAY
RED/WHT
C36
GRN/RED
GAUGE
CONTROL
MODULE
3
GRN/YEL BLU/BLK
GRN
A4
CAN
LO
A1
CAN
HI
A36
RED
WHT
B1
B6
B8
FAN LO
RELAY
CONTROL
MODULE *
H3
BLU/BLK
A5
BRN/YEL
J8
BLU
FAN HI
LT BLU
GRN
A/C
PRESSURE
SWITCH
BLU/RED
2
12 V
RADIATOR
FAN
MOTOR
G201
G201
21-18
ＳＪＣ８ＡＨ６Ｇ２４１００００００００ＥＡＡＴ００
1
A37
3
B
2
RED/GRN
PCM
BLK
A
YEL
PD SW
1
BLK
4
A/C PRESSURE SWITCH A :
The high−low switch opens when
the refrigerant pressure is below
196 kPa (2.0 kgf/cm2, 28 psi) or above
3,140 kPa (32.0 kgf/cm2, 455 psi)
A/C PRESSURE SWITCH B :
The middle switch closes when
the refrigerant pressure is above
1,520 kPa (15.5 kgf/cm2, 220 psi)
* : In the under−hood fuse/relay box
BLK
G202
07/05/09 16:39:40 61SJC020_210_0020
＊９０
: Communication line
WHT/BLU
BLK/YEL
BLK/YEL
WHT/BLU
15
1
BLOWER
MOTOR
2
BLU/BLK
12 V
POWER
TRANSISTOR
25
3
1
BLU/RED
26
2
BLU/YEL
5V
TAILLIGHT
RELAY
2
8
PNK
RED/BLK
GAUGE
ASSEMBLY
RED/BLK
EVAPORATOR
TEMPERATURE SENSOR
2
1
LIGHTS
24
3
RED/BLK
BRN
RED
4
OUTSIDE AIR
TEMPERATURE SENSOR
2
1
RED/BLK
22
5
7
GRY
23
S5V
S−COM
3
PNK/BLK
AMD−P
2
19
M−HOT
PNK/BLU
1
18
AIR MIX
CONTROL
MOTOR
M−COOL
GRN
DRIVING
CIRCUIT
RED/BLK
1
17
YEL/RED
16
2
YEL/BLU
30
29
MODE1
5
MODE2
RED/BLU
28
4
WHT/BLU
27
MODE3
S−COM
7
MODE
CONTROL
MOTOR
3
YEL/GRN
11
BLK/YEL
M−DEF
6
RED/YEL
BLK
M−VENT
MODE4
20
LT BLU
RED/BLK
14
5
GRN/WHT
13
7
GRN/RED
FRS RECIRCULATION
CONTROL
IG2
REC MOTOR
1
12
YEL
1
BLK
HVAC CONTROL UNIT
G402
21-19
07/05/09 16:39:41 61SJC020_210_0021
Heating/Air Conditioning
DTC Troubleshooting
DTC B1202: HVAC Control Unit Internal Error
NOTE:
• Check the battery condition (see page 22-74) and the
charging system (see page 4-26).
• If you are troubleshooting multiple DTCs, be sure to
follow the instructions in B-CAN system diagnosis
test mode A (see page 22-99).
1. Clear the DTC with the HDS.
2. Operate the heater-A/C control system in several
modes.
3. Check for DTCs using the HDS.
DTC B1205: HVAC Control Unit Lost
Communication with Gauge Control Module
(VSP/NE message)
DTC B1206: HVAC Control Unit Lost
Communication with Gauge Control Module
(ECT message)
DTC B1207: HVAC Control Unit Lost
Communication with Gauge Control Module
(ILLUMI message)
NOTE: If you are troubleshooting multiple DTCs, be
sure to follow the instructions in B-CAN system
diagnosis test mode A (see page 22-99).
Is DT C B1202 indicated?
1. Clear the DTC with the HDS.
YES−The HVAC control unit is faulty, replace the
control unit.
2. Operate the heater-A/C control system in several
modes.
NO−Intermittent failure, the HVAC control unit is
OK at this time.
3. Check for DTCs using the HDS.
Is DT C B1205, B1206 and/ or B1207 indicated?
YES−Go to step 4.
NO−Intermittent failure, the gauge control module
and HVAC control unit are OK at this time.
4. Check for DTCs using the HDS.
Is DT C B1060 or B2157 indicated?
YES−Perform the gauge control module input test
(see page 22-122).
NO−Go to step 5.
5. Turn the ignition switch OFF.
6. Disconnect the HVAC control unit 30P connector.
7. Remove the gauge control module (see page
22-263).
21-20
ＳＪＣ８ＡＨ６Ｋ７３３０００Ｙ１２０２ＦＡＡＴ００
ＳＪＣ８ＡＨ６Ｋ７３３０００Ｙ１２０５ＦＡＡＴ０２
07/05/09 16:39:41 61SJC020_210_0022
8. Check for continuity between the HVAC control unit
30P connector No. 11 terminal and gauge control
module connector B (14P) No. 6 terminal.
０１
HVAC CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
LT BLU
DTC B1227 or DTC indicator 9: An Open in
the Outside Air Temperature Sensor Circuit
1. Clear the DTC with the HDS.
2. Operate the heater-A/C control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
Is DT C B1227 or 9 indicated?
YES−Go to step 4.
BRN/YEL
GAUGE CONTROL MODULE CONNECTOR B (14P)
Wire side of female terminals
Is there continuity?
YES−Substitute a known-good HVAC control unit,
then return to step 3 and recheck . If the problem is
still present, replace the gauge control module
(see page 22-263).
NO−Intermittent failure, check for loose wires or
poor connections on the outside air temperature
sensor circuit.
4. Turn the ignition switch OFF.
5. Remove the outside air temperature sensor
(see page 21-52) and test it (see page 21-52).
Is the outside air temperature sensor OK ?
YES−Go to step 6.
NO−Replace the outside air temperature sensor.
NO−Repair open in the wire between the HVAC
control unit and gauge control module.
6. Disconnect the HVAC control unit 30P connector.
7. Check for continuity between the HVAC control unit
30P connector No. 8 terminal and the outside air
temperature sensor 2P connector No. 2 terminal.
０１
HVAC CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
PNK
PNK
OUTSIDE AIR TEMPERATURE SENSOR 2P CONNECTOR
Wire side of female terminals
Is there continuity?
YES−Go to step 8.
NO−Repair open in the wire between the HVAC
control unit and the outside air temperature
sensor.
(cont’d)
21-21
ＳＪＣ８ＡＨ６Ｋ７３３０００Ｙ１２２７ＦＡＡＴ００
07/05/09 16:39:41 61SJC020_210_0023
Heating/Air Conditioning
DTC Troubleshooting (cont’d)
8. Check for continuity between the HVAC control unit
30P connector No. 20 terminal and the outside air
temperature sensor 2P connector No. 1 terminal.
０２
HVAC CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
DTC B1228 or DTC indicator 10: A Short in the
Outside Air Temperature Sensor Circuit
1. Clear the DTC with the HDS.
2. Operate the heater-A/C control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
RED/BLK
Is DT C B1228 or 10 indicated?
RED/BLK
YES−Go to step 4.
NO−Intermittent failure.
OUTSIDE AIR TEMPERATURE SENSOR 2P CONNECTOR
Wire side of female terminals
Is there continuity?
YES−Check for loose wires or poor connections at
the HVAC control unit 30P connector and at the
outside air temperature sensor 2P connector. If the
connections are good, substitute a known-good
HVAC control unit, and recheck. If the symptom/
indication goes away, replace the original HVAC
control unit.
4. Turn the ignition switch OFF.
5. Remove the outside air temperature sensor
(see page 21-52) and test it (see page 21-52).
Is the outside air temperature sensor OK ?
YES−Go to step 6.
NO−Replace the outside air temperature sensor.
6. Disconnect the HVAC control unit 30P connector.
NO−Repair open in the wire between the HVAC
control unit and the outside air temperature
sensor.
21-22
ＳＪＣ８ＡＨ６Ｋ７３３０００Ｙ１２２８ＦＡＡＴ００
07/05/09 16:39:42 61SJC020_210_0024
7. Check for continuity between body ground and the
HVAC control unit 30P connector No. 8 and No. 20
terminals.
０１
DTC B1231 or DTC indicator 7: An Open in
the Evaporator Temperature Sensor Circuit
1. Clear the DTC with the HDS.
HVAC CONTROL UNIT 30P CONNECTOR
PNK
2. Operate the heater-A/C control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
Is DT C B1231 or 7 indicated?
RED/BLK
YES−Go to step 4.
Wire side of female terminals
NO−Intermittent failure, check for loose wires or
poor connections on the evaporator temperature
sensor circuit.
Is there continuity?
4. Turn the ignition switch OFF.
YES−Repair short to body ground in the wires
between the HVAC control unit and the outside air
temperature sensor.
5. Remove the evaporator temperature sensor
(see page 21-53) and test it (see page 21-53).
Is the evaporator temperature sensor OK ?
NO−Go to step 8.
YES−Go to step 6.
8. Check for continuity between the HVAC control unit
30P connector No. 8 and No. 20 terminals.
０２
HVAC CONTROL UNIT 30P CONNECTOR
NO−Replace the evaporator temperature
sensor.
6. Disconnect the HVAC control unit 30P connector.
PNK
RED/BLK
Wire side of female terminals
Is there continuity?
YES−Repair short in the wires between the HVAC
control unit and the outside air temperature
sensor.
NO−Substitute a known-good HVAC control unit,
and recheck. If the symptom/indication goes away,
replace the original HVAC control unit.
(cont’d)
21-23
ＳＪＣ８ＡＨ６Ｋ７３３０００Ｙ１２３１ＦＡＡＴ００
07/05/09 16:39:42 61SJC020_210_0025
Heating/Air Conditioning
DTC Troubleshooting (cont’d)
7. Check for continuity between the HVAC control unit
30P connector No. 24 terminal and the evaporator
temperature sensor 2P connector No. 2 terminal.
０１
HVAC CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
BRN
BRN
EVAPORATOR TEMPERATURE SENSOR 2P CONNECTOR
Wire side of female terminals
8. Check for continuity between the HVAC control unit
30P connector No. 20 terminal and the evaporator
temperature sensor 2P connector No. 1 terminal.
HVAC CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
RED/BLK
RED/BLK
EVAPORATOR TEMPERATURE SENSOR 2P CONNECTOR
Wire side of female terminals
Is there continuity?
Is there continuity?
YES−Go to step 8.
YES−Check for loose wires or poor connections at
the HVAC control unit 30P connector and at the
evaporator temperature sensor 2P connector. If the
connections are good, substitute a known-good
HVAC control unit, and recheck. If the symptom/
indication goes away, replace the original HVAC
control unit.
NO−Repair open in the wire between the HVAC
control unit and the evaporator temperature
sensor.
NO−Repair open in the wire between the HVAC
control unit and the evaporator temperature
sensor.
21-24
０２
07/05/09 16:39:43 61SJC020_210_0026
DTC B1232 or DTC indicator 8: A Short in the
Evaporator Temperature Sensor Circuit
7. Check for continuity between body ground and the
HVAC control unit 30P connector No. 20 and No. 24
terminals.
０１
1. Clear the DTC with the HDS.
2. Operate the heater-A/C control system in several
modes.
HVAC CONTROL UNIT 30P CONNECTOR
3. Check for DTCs using the HDS or self-diagnostic.
RED/BLK
Is DT C B1232 or 8 indicated?
BRN
YES−Go to step 4.
NO−Intermittent failure.
Wire side of female terminals
4. Turn the ignition switch OFF.
5. Remove the evaporator temperature sensor
(see page 21-53) and test it (see page 21-53).
Is the evaporator temperature sensor OK ?
Is there continuity?
YES−Repair short to body ground in the wires
between the HVAC control unit and the evaporator
temperature sensor.
YES−Go to step 6.
NO−Go to step 8.
NO−Replace the evaporator temperature
sensor.
8. Check for continuity between the HVAC control unit
30P connector No. 20 and No. 24 terminals.
０２
6. Disconnect the HVAC control unit 30P connector.
HVAC CONTROL UNIT 30P CONNECTOR
RED/BLK
BRN
Wire side of female terminals
Is there continuity?
YES−Repair short in the wires between the HVAC
control unit and the evaporator temperature
sensor.
NO−Substitute a known-good HVAC control unit,
and recheck. If the symptom/indication goes away,
replace the original HVAC control unit.
21-25
ＳＪＣ８ＡＨ６Ｋ７３３０００Ｙ１２３２ＦＡＡＴ００
07/05/09 16:39:43 61SJC020_210_0027
Heating/Air Conditioning
DTC Troubleshooting (cont’d)
DTC B1233 or DTC indicator 1: An Open in
the Air Mix Control Motor Circuit
1. Clear the DTC with the HDS.
2. Operate the heater-A/C control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
8. Check for continuity between the following
terminals of the HVAC control unit 30P connector
and the air mix control motor 7P connector.
30P:
7P:
No. 20
No. 5
No. 22
No. 7
No. 23
No. 3
HVAC CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
Is DT C B1233 or 1 indicated?
YES−Go to step 4.
NO−Intermittent failure, check for loose wires or
poor connections on the air mix control motor
circuit.
4. Turn the ignition switch OFF.
GRY PNK/BLK
RED/BLK
RED/BLK
GRY
5. Test the air mix control motor (see page 21-55).
PNK/BLK
Is the air mix control motor OK ?
YES−Go to step 6.
AIR MIX CONTROL MOTOR 7P CONNECTOR
Wire side of female terminals
Is there continuity?
NO−Replace the air mix control motor (see page
21-55).
6. Disconnect the air mix control motor 7P connector.
7. Disconnect the HVAC control unit 30P connector.
YES−Check for loose wires or poor connections at
the HVAC control unit 30P connector and at the air
mix control motor 7P connector. If the connections
are good, substitute a known-good HVAC control
unit and recheck. If the symptom/indication goes
away, replace the original HVAC control unit.
NO−Repair any open in the wires between the
HVAC control unit and the air mix control motor.
21-26
ＳＪＣ８ＡＨ６Ｋ７３３０００Ｙ１２３３ＦＡＡＴ００
＊０１
07/05/09 16:39:43 61SJC020_210_0028
DTC B1234 or DTC indicator 2: A Short in the
Air Mix Control Motor Circuit
8. Check for continuity between body ground and the
HVAC control unit 30P connector No. 22 and No. 23
terminals individually.
＊０１
1. Clear the DTC with the HDS.
2. Operate the heater-A/C control system in several
modes.
HVAC CONTROL UNIT 30P CONNECTOR
3. Check for DTCs using the HDS or self-diagnostic.
Is DT C B1234 or 2 indicated?
GRY
PNK/BLK
YES−Go to step 4.
NO−Intermittent failure.
Wire side of female terminals
4. Turn the ignition switch OFF.
5. Test the air mix control motor (see page 21-55).
Is the air mix control motor OK ?
YES−Go to step 6.
NO−Replace the air mix control motor (see page
21-55).
6. Disconnect the air mix control motor 7P connector.
Is there continuity?
YES−Repair any short to body ground in the
wire(s) between the HVAC control unit and the air
mix control motor.
NO−Go to step 9.
9. Check for continuity between the HVAC control unit
30P connector No. 22 and No. 23 terminals.
＊０２
7. Disconnect the HVAC control unit 30P connector.
HVAC CONTROL UNIT 30P CONNECTOR
GRY
PNK/BLK
Wire side of female terminals
Is there continuity between any of the terminals?
YES−Repair the short in the wires.
NO−Go to step 10.
(cont’d)
21-27
ＳＪＣ８ＡＨ６Ｋ７３３０００Ｙ１２３４ＦＡＡＴ００
07/05/09 16:39:44 61SJC020_210_0029
Heating/Air Conditioning
DTC Troubleshooting (cont’d)
10. Turn the ignition switch ON (II), and check the same
terminals for voltage to body ground.
DTC B1235 or DTC indicator 3: A Problem in
the Air Mix Control Linkage, Door, or Motor
＊０３
HVAC CONTROL UNIT 30P CONNECTOR
1. Clear the DTC with the HDS.
2. Operate the heater-A/C control system in several
modes.
GRY
PNK/BLK
3. Check for DTCs using the HDS or self-diagnostic.
Is DT C B1235 or 3 indicated?
YES−Go to step 4.
Wire side of female terminals
NO−Intermittent failure, check for loose wires or
poor connections on the air mix control motor
circuit.
Is there voltage?
4. Turn the ignition switch OFF.
YES−Repair short to power in the wire(s) between
the HVAC control unit and the air mix control motor.
This short may also damage the HVAC control unit.
Repair the short to power before replacing the
HVAC control unit.
5. Test the air mix control motor (see page 21-55).
Is the air mix control motor OK ?
YES−Go to step 6.
NO−Substitute a known-good HVAC control unit,
and recheck. If the symptom/indication goes away,
replace the original HVAC control unit.
NO−Replace the air mix control motor (see page
21-55), or repair the air mix control linkage or
door.
6. Disconnect the air mix control motor 7P connector.
7. Disconnect HVAC control unit 30P connector.
21-28
ＳＪＣ８ＡＨ６Ｋ７３３０００Ｙ１２３５ＦＡＡＴ００
07/05/09 16:39:44 61SJC020_210_0030
8. Check for continuity between the following
terminals of HVAC control unit 30P connector and
the air mix control motor 7P connector.
30P:
7P:
No. 18
No. 1
No. 19
No. 2
＊０１
9. Check for continuity between body ground and
HVAC control unit 30P connector No. 18 and No. 19
terminals individually.
＊０２
HVAC CONTROL UNIT 30P CONNECTOR
HVAC CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
GRN
GRN
PNK/BLU
PNK/BLU
PNK/BLU
GRN
AIR MIX CONTROL MOTOR 7P CONNECTOR
Wire side of female terminals
Is there continuity?
YES−Go to step 9.
NO−Repair open in the wire(s) between the HVAC
control unit and the air mix control motor.
Wire side of female terminals
Is there continuity?
YES−Repair short to body ground in the wire(s)
between the HVAC control unit and the air mix
control motor.
NO−Substitute a known-good HVAC control unit,
and recheck. If the symptom/indication goes away,
replace the original HVAC control unit.
21-29
07/05/09 16:40:44 61SJC020_210_0031
Heating/Air Conditioning
DTC Troubleshooting (cont’d)
DTC B1239 or DTC indicator 4: An Open or
Short in the Mode Control Motor Circuit
1. Clear the DTC with the HDS.
2. Operate the heater-A/C control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
Is DT C B1239 or 4 indicated?
8. Check for continuity between the following
terminals of the HVAC control unit 30P connector
and the mode control motor 7P connector.
30P:
7P:
No. 20
No. 7
No. 27
No. 3
No. 28
No. 4
No. 29
No. 5
No. 30
No. 6
＊０１
HVAC CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
YES−Go to step 4.
NO−Intermittent failure, check for loose wires or
poor connections on the mode control motor
circuit.
RED/BLK
YEL/GRN
WHT/BLU
RED/BLU
4. Turn the ignition switch OFF.
RED/
YEL
5. Test the mode control motor (see page 21-56).
Is the mode control motor OK ?
YEL/
GRN
YES−Go to step 6.
WHT/BLU
RED/
BLK
RED/YEL
NO−Replace the mode control motor (see page
21-56).
6. Disconnect the mode control motor 7P connector.
RED/BLU
MODE CONTROL MOTOR 7P CONNECTOR
Wire side of female terminals
Is there continuity?
7. Disconnect the HVAC control unit 30P connector.
YES−Go to step 9.
NO−Repair open in the wires between the HVAC
control unit and the mode control motor.
21-30
ＳＪＣ８ＡＨ６Ｋ７３３０００Ｙ１２３９ＦＡＡＴ００
07/05/09 16:40:44 61SJC020_210_0032
9. Check for continuity between body ground and the
HVAC control unit 30P connector No. 20, 27, 28, 29,
and 30 terminals individually.
＊０２
11. Turn the ignition switch ON (II), and check the same
terminals for voltage to body ground.
＊０３
HVAC CONTROL UNIT 30P CONNECTOR
HVAC CONTROL UNIT 30P CONNECTOR
RED/BLK
RED/BLK
YEL/GRN
WHT/BLU
RED/
YEL
YEL/GRN
WHT/BLU
RED/
YEL
RED/BLU
RED/BLU
Wire side of female terminals
Wire side of female terminals
Is there any voltage?
Is there continuity?
YES−Repair short to body ground in the wires
between the HVAC control unit and the mode
control motor.
YES−Repair short to power in the wires between
the HVAC control unit and the mode control motor.
This short may also damage the HVAC control unit.
Repair the short to power before replacing the
HVAC control unit.
NO−Go to step 10.
10. Check for continuity between the HVAC control unit
connector terminals as follows.
From terminal
20
27
28
29
To terminals
27, 28, 29, 30
28, 29, 30
29, 30
30
NO−Check for loose wires or poor connections at
the HVAC control unit 30P connector and at the
mode control motor 7P connector. If the
connections are good, substitute a known-good
HVAC control unit, and recheck. If the symptom/
indication goes away, replace the original HVAC
control unit.
Is there continuity between any of the terminals?
YES−Repair the short in the wires.
NO−Go to step 11.
21-31
07/05/09 16:40:44 61SJC020_210_0033
Heating/Air Conditioning
DTC Troubleshooting (cont’d)
DTC B1240 or DTC indicator 5: A Problem in
the Mode Control Linkage, Doors, or Motor
1. Clear the DTC with the HDS.
2. Operate the heater-A/C control system in several
modes.
8. Check for continuity between the following
terminals of HVAC control unit 30P connector and
the mode control motor 7P connector.
30P:
7P:
No. 16
No. 2
No. 17
No. 1
HVAC CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
3. Check for DTCs using the HDS or self-diagnostic.
Is DT C B1240 or 5 indicated?
YES−Go to step 4.
NO−Intermittent failure, check for loose wires or
poor connections on the mode control motor
circuit.
YEL/BLU
YEL/RED
YEL/RED
4. Turn the ignition switch OFF.
5. Test the mode control motor (see page 21-56).
YEL/BLU
MODE CONTROL MOTOR 7P CONNECTOR
Wire side of female terminals
Is the mode control motor OK ?
Is there continuity?
YES−Go to step 6.
YES−Go to step 9.
NO−Replace the mode control motor (see page
21-56), or repair the mode control linkage or
doors.
NO−Repair open in the wire(s) between the HVAC
control unit and the mode control motor.
6. Disconnect the mode control motor 7P connector.
7. Disconnect HVAC control unit 30P connector.
21-32
ＳＪＣ８ＡＨ６Ｋ７３３０００Ｙ１２４０ＦＡＡＴ００
＊０１
07/05/09 16:40:45 61SJC020_210_0034
9. Check for continuity between body ground and
HVAC control unit 30P connector No. 16 and No. 17
terminals individually.
＊０２
DTC B1241 or DTC indicator 6: A Problem in
the Blower Motor Circuit
1. Clear the DTC with the HDS.
HVAC CONTROL UNIT 30P CONNECTOR
2. Operate the heater-A/C control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
YEL/BLU
YEL/RED
Is DT C B1241 or 6 indicated?
YES−Go to step 4.
Wire side of female terminals
NO−Intermittent failure, check for loose wires or
poor connections on the blower motor circuit.
4. Turn the ignition switch OFF.
Is there continuity?
YES−Repair short to body ground in the wire(s)
between the HVAC control unit and the mode
control motor.
5. Check the No. 21 (40 A) fuse in the under-hood
fuse/relay box, and the No. 30 (7.5 A) fuse in the
under-dash fuse/relay box.
Are the f uses OK ?
NO−Substitute a known-good HVAC control unit,
and recheck. If the symptom/indication goes away,
replace the original HVAC control unit.
YES−Go to step 6.
NO−Replace the fuses, and recheck. If the fuses
blow again, check for a short in the No. 21 (40 A)
and No. 30 (7.5 A) fuses circuit.
6. Connect the blower motor 2P connector No. 2
terminal to body ground with a jumper wire.
＊０１
BLOWER MOTOR 2P CONNECTOR
BLU/BLK
JUMPER WIRE
Wire side of female terminals
7. Turn the ignition switch ON (II).
Does the blower motor run?
YES−Go to step 8.
NO−Go to step 23.
(cont’d)
21-33
ＳＪＣ８ＡＨ６Ｋ７３３０００Ｙ１２４１ＦＡＡＴ００
07/05/09 16:40:45 61SJC020_210_0035
Heating/Air Conditioning
DTC Troubleshooting (cont’d)
13. Turn the ignition switch ON (II).
8. Turn the ignition switch OFF.
Does the blower motor run at high speed?
9. Disconnect the jumper wire.
10. Disconnect the power transistor 4P connector.
YES−Go to step 14.
11. Check for continuity between the power transistor
4P connector No. 4 terminal and body ground.
NO−Repair open in the BLU/BLK wire between the
power transistor and the blower motor.
０２
POWER TRANSISTOR 4P CONNECTOR
14. Turn the ignition switch OFF.
15. Disconnect the jumper wire.
16. Disconnect the HVAC control unit 30P connector.
BLK
17. Check for continuity between body ground and the
HVAC control unit 30P connector No. 25 and No. 26
terminals individually.
０４
HVAC CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
Is there continuity?
BLU/RED
BLU/YEL
YES−Go to step 12.
NO−Check for an open in the wire between the
power transistor and body ground. If the wire is OK,
check for poor ground at G402 (see page 22-68).
Wire side of female terminals
12. Connect the power transistor 4P connector No. 3
and No. 4 terminals with a jumper wire.
０３
Is there continuity?
POWER TRANSISTOR 4P CONNECTOR
YES−Repair short to body ground in the wires
between the HVAC control unit and the power
transistor.
NO−Go to step 18.
BLU/BLK
BLK
JUMPER WIRE
Wire side of female terminals
21-34
07/05/09 16:40:46 61SJC020_210_0036
18. Check for continuity between the following
terminals of the HVAC control unit 30P connector
and the power transistor 4P connector.
30P:
4P:
No. 25
No. 1
No. 26
No. 2
０５
HVAC CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
BLU/RED
21. Reconnect the HVAC control unit 30P connector.
22. Test the power transistor (see page 21-54).
Is the power transistor OK ?
YES−Check for loose wire or poor connections at
the HVAC control unit 30P connector and at the
power transistor 4P connector. If the connections
are good, substitute a known-good HVAC control
unit, and recheck. If the symptom/indication goes
away, replace the original HVAC control unit.
BLU/YEL
NO−Replace the power transistor.
BLU/RED
BLU/YEL
23. Disconnect the jumper wire.
24. Disconnect the blower motor 2P connector.
POWER TRANSISTOR 4P CONNECTOR
Wire side of female terminals
25. Measure the voltage between the blower motor 2P
connector No. 1 terminal and body ground.
０７
Is there continuity?
BLOWER MOTOR 2P CONNECTOR
YES−Go to step 19.
NO−Repair open in the wires between the HVAC
control unit and the power transistor.
WHT/BLU
19. Start the engine.
20. Measure the voltage between body ground and the
HVAC control unit 30P connector No. 25 and No. 26
terminals individually.
０６
Wire side of female terminals
HVAC CONTROL UNIT 30P CONNECTOR
Is there battery voltage?
YES−Replace the blower motor.
BLU/RED
BLU/YEL
NO−Go to step 26.
26. Turn the ignition switch OFF.
Wire side of female terminals
27. Remove the blower motor relay from the underhood fuse/relay box, and test it (see page 22-75).
Is the relay OK ?
Is there voltage?
YES−Go to step 28.
YES−Repair short to power in the wires.
NO−Replace the blower motor relay.
NO−Go to step 21.
(cont’d)
21-35
07/05/09 16:40:47 61SJC020_210_0037
Heating/Air Conditioning
DTC Troubleshooting (cont’d)
28. Measure the voltage between the blower motor
relay 4P socket No. 2 terminal and body ground.
０８
BLOWER MOTOR RELAY 4P SOCKET
31. Turn the ignition switch OFF.
32. Check for continuity between the blower motor
relay 4P socket No. 3 terminal and body ground.
１０
BLOWER MOTOR RELAY 4P SOCKET
BLK
Is there battery voltage?
YES−Go to step 29.
Is there continuity?
NO−Replace the under-hood fuse/relay box
(see page 22-72).
YES−Repair open in the WHT/BLU wire between
the blower motor relay and the blower motor.
29. Turn the ignition switch ON (II).
30. Measure the voltage between the blower motor
relay 4P socket No. 4 terminal and body ground.
０９
BLOWER MOTOR RELAY 4P SOCKET
BLK/YEL
Is there battery voltage?
YES−Go to step 31.
NO−Repair open in the wire between the No. 30
(7.5 A) fuse in the under-dash fuse/relay box and
the blower motor relay.
21-36
NO−Check for an open in the wire between the
blower motor relay and body ground. If the wire is
OK, check for poor ground at G202 (see page 22-68).
07/05/09 16:40:47 61SJC020_210_0038
Recirculation Control Motor Circuit Troubleshooting
1. Check the No. 30 (7.5 A) fuse in the under-dash
fuse/relay box.
Is the f use OK ?
5. Turn the ignition switch OFF.
6. Test the recirculation control motor (see page
21-57).
YES−Go to step 2.
Is the recirculation control motor OK ?
NO−Replace the fuse, and recheck. If the fuse
blows again, check for a short in the No. 30 (7.5 A)
fuse circuit.
YES−Go to step 7.
2. Disconnect the recirculation control motor 7P
connector.
NO−Replace the recirculation control motor
(see page 21-57), or repair the recirculation control
linkage or door.
7. Disconnect the HVAC control unit 30P connector.
3. Turn the ignition switch ON (II).
4. Measure the voltage between the recirculation
control motor 7P connector No. 1 terminal and
body ground.
０１
8. Check for continuity between body ground and the
HVAC control unit 30P connector No. 13 and No. 14
terminals individually.
０２
HVAC CONTROL UNIT 30P CONNECTOR
RECIRCULATION CONTROL MOTOR 7P CONNECTOR
GRN/RED
GRN/
WHT
BLK/YEL
Wire side of female terminals
Wire side of female terminals
Is there continuity?
Is there battery voltage?
YES−Go to step 5.
YES−Repair short to body ground in the wires
between the HVAC control unit and the
recirculation control motor.
NO−Repair open in the wire between the No. 30
(7.5 A) fuse in the under-dash fuse/relay box and
the recirculation control motor.
NO−Go to step 9.
(cont’d)
21-37
ＳＪＣ８ＡＨ６Ｇ２４１０００５０６０２ＦＡＡＴ８０
07/05/09 16:40:47 61SJC020_210_0039
Heating/Air Conditioning
Recirculation Control Motor Circuit Troubleshooting (cont’d)
9. Turn the ignition switch ON (II), and check the same
terminals for voltage to body ground.
０３
HVAC CONTROL UNIT 30P CONNECTOR
GRN/RED
GRN/
WHT
11. Check for continuity between the following
terminals of the HVAC control unit 30P connector
and the recirculation control motor 7P connector.
30P:
7P:
No. 13
No. 7
No. 14
No. 5
０４
HVAC CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
GRN/RED
GRN/
WHT
Wire side of female terminals
GRN/RED
Is there any voltage?
YES−Repair short to power in the wires between
the HVAC control unit and the recirculation control
motor. This short may also damage the HVAC
control unit. Repair the short to power before
replacing the HVAC control unit.
NO−Go to step 10.
10. Turn the ignition switch OFF.
GRN/WHT
RECIRCULATION CONTROL MOTOR 7P CONNECTOR
Wire side of female terminals
Is there continuity?
YES−Check for loose wires or poor connections at
the HVAC control unit 30P connector and at the
recirculation control motor 7P connector. If the
connections are good, substitute a known-good
HVAC control unit, and recheck. If the symptom/
indication goes away, replace the original HVAC
control unit.
NO−Repair open in the wires between the HVAC
control unit and the recirculation control motor.
21-38
07/05/09 16:40:48 61SJC020_210_0040
HVAC Control Power and Ground Circuit Troubleshooting
1. Check the No. 30 (7.5 A) fuse in the under-dash
fuse/relay box.
Is the f use OK ?
5. Turn the ignition switch OFF.
6. Check for continuity between the HVAC control unit
30P connector No. 1 terminal and body ground.
０２
YES−Go to step 2.
NO−Replace the fuse, and recheck. If the fuse
blows again, check for a short in the No. 30 (7.5 A)
fuse circuit.
HVAC CONTROL UNIT 30P CONNECTOR
BLK
2. Disconnect the HVAC control unit 30P connector.
3. Turn the ignition switch ON (II).
4. Measure the voltage between the HVAC control
unit 30P connector No. 15 terminal and body
ground.
Wire side of female terminals
０１
HVAC CONTROL UNIT 30P CONNECTOR
BLK/YEL
Wire side of female terminals
Is there continuity?
YES−Check for loose wires or poor connections at
the HVAC control unit 30P connector. If the
connections are good, substitute a known-good
HVAC control unit, and recheck. If the symptom/
indication is still present, substitute a known-good
HVAC control unit, and recheck.
NO−Check for an open in the wire between the
HVAC control unit and body ground. If the wire is
OK, check for poor ground at G402 (see page 22-68).
Is there battery voltage?
YES−Go to step 5.
NO−Repair open in the wire between the No. 30
(7.5 A) fuse in the under-dash fuse/relay box and
the HVAC control unit.
21-39
ＳＪＣ８ＡＨ６Ｇ２４１０００３２５８１ＦＡＡＴ００
07/05/09 16:40:48 61SJC020_210_0041
Heating/Air Conditioning
Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting
NOTE:
• Do not use this troubleshooting procedure if the A/C
compressor is inoperative. Refer to the symptom
troubleshooting index.
• Before performing symptom troubleshooting, check
for powertrain DTCs (see page 11-3).
7. Measure the voltage between the A/C condenser
fan relay 4P socket No. 1 terminal and body ground.
０１
A/C CONDENSER FAN RELAY 4P SOCKET
YEL/GRN
1. Check the No. 20 (30 A) fuse in the under-hood
fuse/relay box, and the No. 30 (7.5 A) fuse in the
under-dash fuse/relay box.
Are the f uses OK ?
YES−Go to step 2.
NO−Replace the fuses, and recheck. If the fuses
blow again, check for a short in the No. 20 (30 A)
and No. 30 (7.5 A) fuses circuit.
2. Remove the A/C condenser fan relay from the
auxiliary under-hood fuse/relay box, and test it
(see page 22-75).
Is the relay OK ?
YES−Go to step 3.
Is there battery voltage?
YES−Go to step 8.
NO−Repair open in the wire between the No. 20
(30 A) fuse in the auxiliary under-hood fuse/relay
box and the A/C condenser fan relay.
8. Connect the A/C condenser fan relay 4P socket
No. 1 and No. 2 terminals with a jumper wire.
NO−Replace the A/C condenser fan relay.
3. Connect the HDS to the DLC (see page 21-8).
０２
A/C CONDENSER FAN RELAY 4P SOCKET
4. Turn the ignition switch ON (II).
YEL/GRN
5. Turn on the A/C on the HVAC control unit.
JUMPER WIRE
BLU/YEL
6. Check the FAN LOW CTRL in the PGM-FI Data List
with the HDS.
Is the F AN LOW CT RL on?
YES−Go to step 7.
NO−Substitute a known-good PCM (see page 11-8),
and retest. If the symptom/indication goes away
with a known-good PCM, replace the original PCM
(see page 11-205).
Do the A/ C condenser and radiator f ans run?
YES−Go to step 9.
NO−Go to step 18.
21-40
ＳＪＣ８Ａ００Ｇ１０１１０２４９１１２ＦＡＡＴ１０
07/05/09 16:40:49 61SJC020_210_0042
9. Disconnect the jumper wire.
12. Turn the ignition switch OFF.
10. Turn the ignition switch ON (II).
13. Reinstall the A/C condenser fan relay.
11. Measure the voltage between the A/C condenser
fan relay 4P socket No. 4 terminal and body ground.
14. Jump the SCS line with the HDS.
０３
A/C CONDENSER FAN RELAY 4P SOCKET
NOTE: This step must be done to protect the
powertrain control module (PCM) from damage.
15. Disconnect PCM connector A (44P).
16. Connect the PCM connector A (44P) No. 4 terminal
to body ground with a jumper wire.
０４
PCM CONNECTOR A (44P)
BLU/YEL
GRN/YEL
Is there battery voltage?
YES−Go to step 12.
JUMPER WIRE
NO−Go to step 36.
Terminal side of female terminals
17. Turn the ignition switch ON (II).
Do the A/ C condenser and radiator f ans run on
LO?
YES−Check for loose wires or poor connections at
PCM connector A (44P) No. 4 terminal. If the
connections are good, substitute a known-good
PCM, and recheck. If the symptom/indication goes
away, replace the original PCM (see page 11-205).
NO−Repair open in the wire between the A/C
condenser fan relay and the PCM.
18. Disconnect the jumper wire.
19. Reinstall the A/C condenser fan relay.
20. Disconnect the A/C condenser fan 2P connector.
21. Turn the ignition switch ON (II), then set the A/C
button and fan control dial ON.
(cont’d)
21-41
07/05/09 16:40:49 61SJC020_210_0043
Heating/Air Conditioning
Radiator and A/C Condenser Fan Low Speed Circuit Troubleshooting
(cont’d)
22. Measure the voltage between the A/C condenser
fan 2P connector No. 2 terminal and body ground.
０５
27. Set the A/C button and fan control dial OFF, then
turn the ignition switch OFF.
28. Disconnect the jumper wire.
A/C CONDENSER FAN 2P CONNECTOR
29. Remove the fan control relay from the auxiliary
under-hood relay box, and test it (see page 22-75).
Is the relay OK ?
BLU/YEL
YES−Go to step 30.
NO−Replace the fan control relay.
Wire side of female terminals
Is there battery voltage?
30. Turn the ignition switch ON (II), then set the A/C
button and fan control dial ON.
31. Measure the voltage between the fan control relay
5P socket No. 1 terminal and body ground.
０７
YES−Go to step 23.
FAN CONTROL RELAY 5P SOCKET
NO−Repair open in the wire between the A/C
condenser fan relay and the A/C condenser fan.
WHT/RED
23. Set the A/C button and fan control dial OFF, then
turn the ignition switch OFF.
24. Reconnect the A/C condenser fan 2P connector.
25. Connect the A/C condenser fan 2P connector No. 1
terminal to body ground with a jumper wire.
０６
A/C CONDENSER FAN 2P CONNECTOR
Is there battery voltage?
YES−Go to step 32.
WHT/RED
NO−Repair open in the wire between the A/C
condenser fan and the fan control relay.
JUMPER WIRE
32. Set the A/C button and fan control dial OFF, then
turn the ignition switch OFF.
Wire side of female terminals
26. Turn the ignition switch ON (II), then set the A/C
button and fan control dial ON.
Does the A/ C condenser f an run?
YES−Go to step 27.
NO−Replace the A/C condenser fan motor.
21-42
07/05/09 16:40:50 61SJC020_210_0044
０９
33. Disconnect the radiator fan 2P connector.
36. Turn the ignition switch OFF.
34. Check for continuity between the fan control relay
5P socket No. 4 terminal and the radiator fan 2P
connector No. 2 terminal.
37. Remove A/C diode A from right engine
compartment wire harness.
FAN CONTROL RELAY 5P SOCKET
38. Using the diode setting (
) on a DVOM, check
for current flow in both directions between the A/C
diode A No. 1 and No. 2 terminals.
１１
A/C DIODE A
BLU/BLK
BLU/BLK
RADIATOR FAN 2P CONNECTOR
Wire side of female terminals
1
2
2
1
Is there continuity?
YES−Go to step 35.
Is there current f low in only one direction?
NO−Repair open in the wire between the fan
control relay and the radiator fan.
YES−Go to step 39.
NO−Replace A/C diode A.
35. Check for continuity between the radiator fan 2P
connector No. 1 terminal and body ground.
39. Turn the ignition switch ON (II).
１０
RADIATOR FAN 2P CONNECTOR
40. Measure the voltage between the A/C diode 4P
socket No. 2 terminal and body ground.
１２
A/C DIODE 4P SOCKET
BLK
BLK/YEL
Wire side of female terminals
Is there continuity?
YES−Replace the radiator fan motor.
Is there battery voltage?
NO−Check for an open in the wire between the
radiator fan and body ground. If the wire is OK,
check for poor ground at G201 (see page 22-68).
YES−Repair open in the wire between A/C diode A
and the A/C condenser fan relay.
NO−Repair open in the wire between the No. 30
(7.5 A) fuse in the under-dash fuse/relay box and
A/C diode A.
21-43
07/05/09 16:40:50 61SJC020_210_0045
Heating/Air Conditioning
A/C Condenser Fan High Speed Circuit Troubleshooting
NOTE:
• Do not use this troubleshooting procedure if the
radiator fan and/or the A/C compressor is inoperative.
Refer to the symptom troubleshooting index.
• Before performing symptom troubleshooting, check
for powertrain DTCs (see page 11-3).
6. Check for continuity between the fan control relay
5P socket No. 2 terminal and body ground.
０２
FAN CONTROL RELAY 5P SOCKET
BLK
1. Check the No. 30 (7.5 A) fuse in the under-dash
fuse/relay box.
Is the f use OK ?
YES−Go to step 2.
NO−Replace the fuse, and recheck. If the fuse
blows again, check for a short in the No. 30 (7.5 A)
fuse circuit.
Is there continuity?
2. Remove the fan control relay from the auxiliary
under-hood relay box, and test it (see page 22-75).
YES−Go to step 7.
NO−Check for an open in the wire between the fan
control relay and body ground. If the wire is OK,
check for poor ground at G201 (see page 22-68).
Is the relay OK ?
YES−Go to step 3.
NO−Replace the fan control relay.
7. Remove the radiator fan relay from the auxiliary
under-hood fuse/relay box.
3. Turn the ignition switch ON (II).
4. Measure the voltage between the No. 5 terminal of
the fan control relay 5P socket and body ground.
０１
FAN CONTROL RELAY 5P SOCKET
BLU/YEL
Is there battery voltage?
YES−Go to step 5.
NO−Go to step 9.
5. Turn the ignition switch OFF.
21-44
ＳＪＣ８Ａ００Ｇ１０１１０２１２０３３ＦＡＡＴ００
07/05/09 16:40:51 61SJC020_210_0046
8. Check for continuity between the fan control relay
5P socket No. 3 terminal and the radiator fan relay
4P socket No. 3 terminal.
０３
FAN CONTROL RELAY 5P SOCKET
11. Turn the ignition switch ON (II).
12. Measure the voltage between the A/C diode 4P
socket No. 2 terminal and body ground.
０５
A/C DIODE 4P SOCKET
GRN
BLK/YEL
GRN
RADIATOR FAN RELAY 4P SOCKET
Is there battery voltage?
Is there continuity?
YES−Repair open in the GRN wire between the
radiator fan relay No. 3 terminal and the PCM A5
terminal.
NO−Repair open in the wire between the fan
control relay and the radiator fan relay.
YES−Repair open in the wire between A/C diode A
and the condenser fan control relay.
NO−Repair open in the wire between the No. 30
(7.5 A) fuse in the under-dash fuse/relay box and
A/C diode A.
9. Remove A/C diode A from right engine
compartment wire harness.
10. Using the diode setting(
) on a DVOM, check
for current flow in both directions between the A/C
diode A No. 1 and No. 2 terminals.
０４
A/C DIODE A
1
2
1
2
Is there current f low in only one direction?
YES−Go to step 11.
NO−Replace A/C diode A.
21-45
07/05/09 16:40:52 61SJC020_210_0047
Heating/Air Conditioning
Radiator and A/C Condenser Fan High Speed Circuit Troubleshooting
NOTE:
• Do not use this troubleshooting procedure if only one
fan is inoperative, or if the A/C compressor is
inoperative. Refer to the symptom troubleshooting
index.
• Before performing symptom troubleshooting, check
for powertrain DTCs (see page 11-3).
• The normal operating A/C pressure for the radiator
and A/C condenser fans to run at high speed is
1,520 kPa (15.5 kgf/cm2, 221 psi).
1. Check the No. 19 (30 A) fuse and No. 20 (30 A) fuse
in the under-hood fuse/relay box, and the No. 30
(7.5 A) fuse in the under-dash fuse/relay box.
Are the f uses OK ?
YES−Go to step 2.
NO−Replace the fuse(s), and recheck.
7. Connect the A/C pressure switch 4P connector
No. 2 and No. 3 terminals with a jumper wire.
０２
A/C PRESSURE SWITCH 4P CONNECTOR
BLK
RED/GRN
JUMPER WIRE
Wire side of female terminals
Do the radiator and condenser f ans run at high
speed?
YES−Replace the A/C pressure switch.
2. Using the HDS, confirm the following values in the
Data List at idle.
A/C SWITCH
on
A/C CLUTCH
on
Fan Low Speed
on
Fan High Speed
on
Are all the values OK ?
YES−Go to step 3.
NO−Troubleshoot the value that is not the
specifications.
3. Turn the ignition switch OFF.
4. Disconnect the A/C pressure switch 4P connector.
5. Check for continuity between the A/C pressure
switch 4P connector No. 2 terminal and body
ground.
NO−Go to step 8.
8. Jump the SCS line with the HDS.
NOTE: This step must be done to protect the
powertrain control module (PCM) from damage.
9. Disconnect PCM connector A (44P).
10. Check for continuity between the PCM connector A
(44P) No. 37 terminal and the A/C pressure switch
4P connector No. 3 terminal.
PCM CONNECTOR A (44P)
Terminal side of female terminals
RED/GRN
０１
A/C PRESSURE SWITCH 4P CONNECTOR
RED/GRN
BLK
A/C PRESSURE SWITCH 4P CONNECTOR
Wire side of female terminals
Is there continuity?
Wire side of female terminals
Is there continuity?
YES−Go to step 6.
NO−Check for an open in the wire between the A/C
pressure switch and body ground. If the wire is OK,
check for poor ground at G202 (see page 22-68).
6. Turn the ignition switch ON (II), then set the A/C
button and fan control dial to ON.
YES−Check for loose wires or poor connections at
PCM connector A (44P). If the connections are good,
substitute a known-good PCM, and recheck. If the
symptom/indication goes away, replace the
original PCM (see page 11-205).
NO−Repair open in the wire between the PCM and
A/C pressure switch.
21-46
ＳＪＣ８Ａ００Ｇ１０１１０２４９１１１ＦＡＡＴ１０
０３
07/05/09 16:40:52 61SJC020_210_0048
A/C Compressor Clutch Circuit Troubleshooting
NOTE:
• It is normal for the A/C compressor to turn off under
certain conditions, such as low idle, high engine
coolant temperature, or hard acceleration.
• Do not use this troubleshooting procedure if the fans
are also inoperative with the A/C on. Refer to the
symptom troubleshooting index.
• Before doing any symptom troubleshooting, check
for powertrain DTCs (see page 11-3).
1. Check the No. 12 (7.5 A) fuse in the under-hood
fuse/relay box, and the No. 30 (7.5 A) fuse in the
under-dash fuse/relay box.
7. Remove the A/C compressor clutch relay from the
under-hood fuse/relay box, and test it (see page
22-75).
Is the relay OK ?
YES−Go to step 8.
NO−Replace the A/C compressor clutch relay.
8. Measure the voltage between the A/C compressor
clutch relay 4P socket No. 1 terminal and body
ground.
０１
Are the f uses OK ?
A/C COMPRESSOR CLUTCH RELAY 4P SOCKET
YES−Go to step 2.
NO−Replace the fuses and recheck. If the fuses
blow again, check for a short in the No. 12 (7.5 A)
and No. 30 (7.5 A) fuses circuit.
2. Connect the HDS to the DLC (see page 21-8).
3. Start the engine.
4. Turn on the A/C on the HVAC control unit.
Is there battery voltage?
5. Check the A/C CLUTCH in the PGM-FI Data List with
the HDS.
YES−Go to step 9.
Is the A/ C CLUT CH on?
YES−Go to step 7.
NO−Replace the under-hood fuse/relay box
(see page 22-72).
9. Connect the A/C compressor clutch relay 4P socket
No. 1 and No. 2 terminals with a jumper wire.
NO−Go to step 6.
０２
A/C COMPRESSOR CLUTCH RELAY 4P SOCKET
6. Check the engine coolant temperature and idle
speed (use the HDS PGM-FI data list if possible).
ECT Sensor 2
TP sensor
RPM
169−194 °F (76 −90 °C)
About 0.5 V at idle
More than 730
JUMPER WIRE
BLU/RED
Are the coolant temperature and idle speed OK ?
YES−Go to step 7.
NO−Troubleshoot and repair the cause of the high
engine coolant temperature or low idle.
Does the A/ C compressor clutch click?
YES−Go to step 10.
NO−Go to step 19.
(cont’d)
21-47
ＳＪＣ８Ａ００Ｇ１０１１０１１２０１２ＦＡＡＴ８０
07/05/09 16:40:53 61SJC020_210_0049
Heating/Air Conditioning
A/C Compressor Clutch Circuit Troubleshooting (cont’d)
10. Disconnect the jumper wire.
13. Turn the ignition switch OFF.
11. Turn the ignition switch ON (II).
14. Reinstall the A/C compressor clutch relay.
12. Measure the voltage between the A/C compressor
clutch relay 4P socket No. 4 terminal and body
ground.
15. Jump the SCS line with the HDS.
０３
A/C COMPRESSOR CLUTCH RELAY 4P SOCKET
NOTE: This step must be done to protect the
powertrain control module (PCM) from damage.
16. Disconnect PCM connector A (44P).
17. Connect the PCM connector A (44P) No. 14 terminal
to body ground with a jumper wire.
PCM CONNECTOR A (44P)
BLK/YEL
Is there battery voltage?
YES−Go to step 13.
NO−Repair open in the wire between the No. 30
(7.5 A) fuse in the under-dash fuse/relay box and
the A/C compressor clutch relay.
21-48
RED
JUMPER WIRE
Terminal side of female terminals
０４
07/05/09 16:40:53 61SJC020_210_0050
A/C Pressure Switch Circuit
Troubleshooting
18. Turn the ignition switch ON (II).
Does the A/ C compressor click?
YES−Check for loose wires or poor connections at
PCM connector A (44P). If the connections are good,
check the PCM grounds. If the grounds are good,
substitute a known-good PCM, and recheck. If the
symptom/indication goes away, replace the
original PCM (see page 11-205).
NO−Repair open in the wire between the A/C
compressor clutch relay and the PCM.
19. Disconnect the jumper wire.
20. Disconnect the A/C compressor clutch 1P connector.
21. Check for continuity between the A/C compressor
clutch relay 4P socket No. 2 terminal and the A/C
compressor clutch 1P connector No. 1 terminal.
０５
A/C COMPRESSOR CLUTCH RELAY 4P SOCKET
BLU/RED
NOTE:
• Do not use this troubleshooting procedure if any of
the following items are operative; A/C condenser fan,
radiator fan, A/C compressor. Refer to the symptom
troubleshooting index.
• Before doing any symptom troubleshooting, check
for powertrain DTCs (see page 11-3).
• If the blower motor does not run at all speeds, the A/C
compressor will be inoperative. Before performing
any other troubleshooting, repair the cause of the
inoperative blower motor.
1. Check for body DTCs using B-CAN system
diagnosis test mode A troubleshooting (see page
22-99).
Are there any DT Cs indicated?
YES−Do the appropriate troubleshooting for the
DTC indicated.
NO−Go to step 3.
2. Refer to the PGM-FI ECU Data List.
Is the A/ C switch of f ?
YES−Go to step 3.
NO−Refer to the symptom troubleshooting
index.
BLU/RED
3. Disconnect the A/C pressure switch 4P connector.
A/C COMPRESSOR CLUTCH 1P CONNECTOR
Terminal side of male terminals
Is there continuity?
YES−Check the A/C compressor clutch clearance,
and the compressor clutch field coil (see page
21-68). Repair as needed.
4. Turn the ignition switch ON (II).
5. Measure the voltage between the A/C pressure
switch 4P connector No. 4 terminal and body
ground.
０１
A/C PRESSURE SWITCH 4P CONNECTOR
NO−Repair open in the wire between the A/C
compressor clutch relay and the A/C compressor
clutch.
BLU/RED
Wire side of female terminals
Is there 5 V or more?
YES−Go to step 6.
NO−Go to step 20.
(cont’d)
21-49
ＳＪＣ８ＡＨ６Ｇ１０１０００１２０６２ＦＡＡＴ８０
07/05/09 16:40:54 61SJC020_210_0051
Heating/Air Conditioning
A/C Pressure Switch Circuit Troubleshooting (cont’d)
6. Connect the A/C pressure switch 4P connector
No. 4 terminal to body ground with a jumper wire.
０７
10. Reconnect the A/C pressure switch 4P connector.
11. Disconnect the HVAC control unit 30P connector.
A/C PRESSURE SWITCH 4P CONNECTOR
12. Turn the ignition switch ON (II).
13. Measure the voltage between the HVAC control
unit 30P connector No. 12 terminal and body
ground.
BLU/RED
０３
HVAC CONTROL UNIT 30P CONNECTOR
JUMPER WIRE
YEL
Wire side of female terminals
7. Start the engine.
Does the compressor and f ans come on?
Wire side of female terminals
YES−Go to step 8.
Is there 5 V or more?
NO−Check the connection of under-hood fuse/
relay box connector H (18P) No. 3 terminal. If the
connection is OK, replace the under-hood fuse/
relay box (see page 22-72).
8. Disconnect a jumper wire, and turn the ignition
switch OFF.
9. Check for continuity between the A/C pressure
switch No. 1 and No. 4 terminals.
０２
YES−Go to step 14.
NO−Repair the open in the wire between the
HVAC control unit and the A/C pressure switch.
14. Turn the ignition switch OFF.
15. Measure the evaporator temperature sensor
resistance between the HVAC control unit 30P
connector No. 20 and No. 24 terminals.
０４
A/C PRESSURE SWITCH
HVAC CONTROL UNIT 30P CONNECTOR
RED/BLK
BRN
Wire side of female terminals
Is the resistance less than 24 k
?
Is there continuity?
YES−Go to step 16.
YES−Go to step 10.
NO−Go to step 19.
21-50
NO−Test the evaporator temperature sensor
(see page 21-53).
07/05/09 16:40:54 61SJC020_210_0052
16. Reconnect the HVAC control unit 30P connector.
22. Reconnect under-hood relay box connector H (18P).
17. Turn the ignition switch ON (II).
23. Connect the A/C pressure switch connector No. 4
terminal to body ground with the jumper wire.
０６
18. Check that blower motor operates at all speeds.
Does the blower motor operate at all speeds?
A/C PRESSURE SWITCH 4P CONNECTOR
YES−Check for loose wires or poor connections at
the HVAC control unit 30P connector and at the A/C
pressure switch 4P connector. If the connections
are good, substitute a known-good HVAC control
unit and recheck. If the symptom/indication goes
away, replace the original HVAC control unit.
NO−Repair the problem in the blower motor
circuit.
BLU/RED
JUMPER WIRE
Wire side of female terminals
19. Check for proper A/C system pressure.
24. Start the engine.
Is the pressure within specif ications?
Do the A/ C compressor and f ans come on?
YES−Replace the A/C pressure switch.
YES−Replace the relay control module.
NO−Repair the A/C pressure problem.
20. Disconnect under-hood relay box connector H (18P).
21. Check for continuity between the A/C pressure
switch connector No. 4 terminal and under-hood
relay box connector H (18P) No. 3 terminal.
０５
NO−Check for loose wires or poor connections. If
the connections are good, check the grounds. If the
grounds are good, replace the relay control
module.
UNDER-HOOD RELAY BOX CONNECTOR H (18P)
Wire side of female terminals
BLU/RED
BLU/RED
A/C PRESSURE SWITCH 4P CONNECTOR
Wire side of female terminals
Is there continuity?
YES−Go to step 22.
NO−Repair open in the wire between the relay
control module and the A/C pressure switch.
21-51
07/05/09 16:40:55 61SJC020_210_0053
Heating/Air Conditioning
Outside Air Temperature Sensor
Test
1. Remove the outside air temperature sensor
(see page 21-52).
2. Dip the sensor in ice water, and measure the
resistance. Then pour warm water on the sensor,
and check for a change in resistance.
Outside Air Temperature Sensor
Replacement
1. Lift the tab (A) to release the lock, then remove the
outside air temperature sensor (B) from the
bulkhead bracket. Disconnect the 2P connector (C)
from the outside air temperature sensor.
０１
C
3. Compare the resistance reading between the No. 1
and No. 2 terminals of the outside air temperature
sensor with the specifications shown in the graph;
the resistance should be within the specifications.
＊０１
OUTSIDE AIR TEMPERATURE SENSOR
B
Terminal side of male terminals
A
2. Install the sensor in the reverse order of removal.
12
11
10
9
8
RESISTANCE 7
6
(k )
5
4
3
2
1
14
−10
32 50 68 86 104 °F
0
10 20 30 40 °C
TEMPERATURE
4. If the resistance is not as specified, replace the out
side air temperature sensor (see page 21-52).
21-52
ＳＪＣ８Ａ００Ｇ２４１０００４３９０１ＦＥＡＴ００
ＳＪＣ８Ａ００Ｇ２４１０００４３９０１ＫＢＡＴ０２
07/05/09 16:40:55 61SJC020_210_0054
Evaporator Temperature Sensor
Test
Evaporator Temperature Sensor
Replacement
1. Remove the evaporator temperature sensor
(see page 21-53).
1. Remove the driver’s dashboard lower cover
(see page 20-83).
2. Dip the sensor in ice water, and measure the
resistance between its terminals.
2. Disconnect the 2P connector (A) from the
evaporator temperature sensor (B), then remove
the connector clip (C). Remove the self-tapping
screw, and carefully pull out the evaporator
temperature sensor.
０１
EVAPORATOR TEMPERATURE SENSOR
０１
B
Terminal side of male terminals
3. Then pour warm water on the sensor, and check for
a change in resistance.
4. Compare the resistance readings with the
specifications shown in the graph; the resistance
should be within the specifications.
＊０１
40
C
A
3. Install the sensor in the reverse order of removal.
30
RESISTANCE
(k )
20
10
32
0
50
68
86 °F
10
20
30 °C
TEMPERATURE
5. If the resistance is not as specified, replace the
evaporator temperature sensor (see page 21-53).
21-53
ＳＪＣ８Ａ００Ｇ１０１２３６２５３３１ＦＥＡＴ８０
ＳＪＣ８Ａ００Ｇ１０１２３６２５３３１ＫＢＡＴ８０
07/05/09 16:40:56 61SJC020_210_0055
Heating/Air Conditioning
Power Transistor Test
1. Disconnect the 4P connector from the power
transistor.
3. Carefully release the lock tab on the No. 2 terminal
(BLU/YEL) (A) in the 4P connector, then remove the
terminal and insulate it from body ground.
０２
2. Measure the resistance between the No. 1 and
No. 3 terminals of the power transistor. It should be
about 1.5 k .
• If the resistance is within the specifications, go to
step 3.
• If the resistance is not within the specifications,
replace the power transistor.
NOTE: Also check the blower motor. Power
transistor failure can be caused by a defective
blower motor.
A
＊０１
POWER TRANSISTOR
JUMPER WIRE
(To 12 V Power source on vehicle)
4. Reconnect the 4P connector to the power transistor.
5. Make sure the BLU/YEL wire is completely isolated,
then supply 12 V to the No. 2 cavity with a jumper
wire.
Terminal side of male terminals
6. Turn the ignition switch ON (II), and check that the
blower motor runs.
• If the blower motor does not run, replace the
power transistor.
• If the blower motor runs, the power transistor is
OK.
21-54
ＳＪＣ８Ａ００Ｇ２４１１３６１４６３１ＦＥＡＴ８０
07/05/09 16:40:57 61SJC020_210_0056
Air Mix Control Motor Test
Air Mix Control Motor Replacement
1. Remove the driver’s dashboard lower cover
(see page 20-83).
NOTE: Before testing, check for HVAC DTCs (see page
21-8).
2. Remove the self-tapping screws and the duct (A).
1. Disconnect the 7P connector from the air mix
control motor.
０１
A
Incorrectly applying power and ground to
the air mix control motor will damage it.
Follow the instructions carefully.
2. Connect battery power to the No. 1 terminal of the
air mix control motor, and ground the No. 2
terminal; the air mix control motor should run, and
stop at Max Cool. If it doesn’t, reverse the
connections; the air mix control motor should run,
and stop at Max Hot. When the air mix control
motor stops running, disconnect battery power
immediately.
０１
3. Disconnect the 7P connector (A) from the air mix
control motor (B). Remove the self-tapping screws
and the air mix control motor from the heater unit.
AIR MIX CONTROL MOTOR
０２
3. If the air mix control motor did not run in step 2,
remove it, then check the air mix control linkage
and door for smooth movement.
B
A
• If the linkage and door move smoothly, replace
the air mix control motor (see page 21-55).
• If the linkage or door sticks or binds, repair them
as needed.
• If the air mix control motor runs smoothly, go to
step 4.
4. Measure the resistance between the No. 5 and
No. 7 terminals. It should be between 4.2 to 7.8 k
.
4. Install the motor in the reverse order of removal.
Make sure the pin on the motor is properly
engaged with the linkage. After installation, make
sure the motor runs smoothly.
5. Reconnect the air mix control motor 7P connector,
then turn the ignition switch ON (II).
6. Using the backprobe set, measure the voltage
between the No. 3 and No. 7 terminals.
Max Cool:
Max Hot:
About 0.5 V
About 4.5 V
7. If either the resistance or voltage readings are not
as specified, replace the air mix control motor
(see page 21-55).
21-55
ＳＪＣ８ＡＨ６Ｇ２４１０００１２７０１ＦＥＡＴ８１
ＳＪＣ８ＡＨ６Ｇ２４１０００１２７０１ＫＢＡＴ８１
07/05/09 16:40:57 61SJC020_210_0057
Heating/Air Conditioning
Mode Control Motor Test
NOTE: Before testing, check for HVAC DTCs (see page
21-8).
1. Disconnect the 7P connector from the mode control
motor.
Mode Control Motor Replacement
1. Open the glove box. Remove the damper and the
glove box stop on each side, then let the glove box
hang down (see page 20-85).
2. Disconnect the 7P connector (A) from the mode
control motor (B). Remove the self-tapping screws
and the mode control motor from the heater unit.
０２
Incorrectly applying power and ground to
the mode control motor will damage it.
Follow the instructions carefully.
2. Connect battery power to the No. 1 terminal of the
mode control motor, and ground the No. 2
terminal; the mode control motor should run
smoothly, and stop at Vent. If it doesn’t, reverse the
connections; the mode control motor should run
smoothly, and stop at Defrost. When the mode
control motor stops running, disconnect battery
power immediately.
０１
A
MODE CONTROL MOTOR
B
3. Install the motor in the reverse order of removal.
Make sure the pin on the motor is properly
engaged with the linkage. After installation, make
sure the motor runs smoothly.
3. If the mode control motor did not run in step 2,
remove it, then check the mode control linkage and
doors for smooth movement.
• If the linkage and doors move smoothly, replace
the mode control motor (see page 21-56).
• If the linkage or doors stick or bind, repair them
as needed.
• If the mode control motor runs smoothly, go to
step 4.
4. Use a digital multimeter with an output of 1 mA or
less at the 20 k range. With the mode control
motor running as in step 2, check for continuity
between the No. 3, 4, 5, and 6 terminals and the
No. 7 terminal individually. There should be
continuity for a moment at each terminal as the
motor moves past the switch’s terminal.
5. If there is no continuity for a moment at each
terminal, replace the mode control motor (see page
21-56).
21-56
ＳＪＣ８Ａ００Ｇ２４１０００４０３０１ＦＥＡＴ８０
ＳＪＣ８Ａ００Ｇ２４１０００４０３０１ＫＢＡＴ８０
07/05/09 16:40:58 61SJC020_210_0058
Recirculation Control Motor Test
Recirculation Control Motor
Replacement
NOTE: Before testing, check for HVAC DTCs (see page
21-8).
1. Disconnect the 7P connector from the recirculation
control motor.
Incorrectly applying power and ground to
the recirculation control motor will damage it.
Follow the instructions carefully.
1. Open the glove box. Remove the damper and the
glove box stop on each side, then let the glove box
hang down (see page 20-85).
2. Disconnect the 7P connector (A) from the
recirculation control motor (B). Remove the selftapping screws and the recirculation control motor
from the blower unit.
０１
2. Connect battery power to the No. 1 terminal of the
recirculation control motor, and ground the No. 5
and No. 7 terminals; the recirculation control motor
should run smoothly. To avoid damaging the
recirculation control motor, do not reverse power
and ground. Disconnect the No. 5 or No. 7
terminals from ground; the recirculation control
motor should stop at Fresh (when the No. 7
terminal is disconnected) or Recirculate (when the
No. 5 terminal is disconnected). Don’t cycle the
recirculation control motor for a long time.
B
A
０１
RECIRCULATION CONTROL MOTOR
3. Install the motor in the reverse order of removal.
Make sure the pin on the motor is properly
engaged with the linkage. After installation, make
sure the motor runs smoothly.
3. If the recirculation control motor did not run in step
2, remove it, then check the recirculation control
linkage and door for smooth movement.
• If the linkage and door move smoothly, replace
the recirculation control motor (see page 21-57).
• If the linkage or door stick or bind, repair them as
needed.
21-57
ＳＪＣ８Ａ００Ｇ２４１０００５０６０１ＦＥＡＴ８０
ＳＪＣ８Ａ００Ｇ２４１０００５０６０１ＫＢＡＴ８０
07/05/09 16:40:58 61SJC020_210_0059
Heating/Air Conditioning
HVAC Control Unit Removal/
Installation
Dust and Pollen Filter Replacement
1. Remove the instrument panel (see page 20-81).
1. Open the glove box. Remove the damper and the
glove box stop on each side, then let the glove box
hang down (see page 20-85).
2. Remove the self-tapping screws, and the HVAC
control unit (A).
2. Remove the dust and pollen filter assembly (A)
from the evaporator.
０１
０１
A
A
3. Remove the filter (A) from the housing (B), and
replace the filter.
A
3. Install the control unit in the reverse order of
removal. After installation, operate the various
functions to make sure they work properly.
4. Run the self-diagnosis function to confirm that
there are no problems in the system (see page
21-8).
B
4. Install the filter in the reverse order of removal.
Make sure that there is no air leaking out of the
evaporator.
21-58
ＳＪＣ８ＡＨ６Ｇ２４１０００３２５８５ＫＤＡＴ００
ＳＪＣ８Ａ００Ｇ２４１０００２２４０１ＫＢＡＴ８０
０２
07/05/09 16:40:59 61SJC020_210_0060
Blower Unit Removal/Installation
1. Remove the glove box housing (see page 20-85).
2. Remove the bolts and the glove box frame (A).
4. Disconnect the connectors (A) from the blower
motor and the power transistor, then remove the
wire harness clips (B).
０１
０３
A
A
3. Cut the plastic cross brace (A) in the glove box
opening with diagonal cutters in the area shown,
and discard it.
０２
B
5. Disconnect the connector (A) from the recirculation
control motor, then remove the self-tapping screws,
the mounting nuts, and the blower unit (B).
０４
A
6 x 1.0 mm
9.8 N·m
(1.0 kgf·m,
7.2 lbf·ft)
A
Cut here.
B
6. Install the unit in the reverse order of removal.
Make sure that there is no air leakage.
21-59
ＳＪＣ８Ａ００Ｇ２４１１３６０００００ＫＤＡＴ０２
07/05/09 16:42:18 61SJC020_210_0061
Heating/Air Conditioning
Blower Unit Component
Replacement
Evaporator Core Replacement
1. Recover the refrigerant with a recovery/recycling/
charging station (see page 21-73).
Note these items when overhauling the blower unit:
• The recirculation control motor (A), the blower motor
cover (B), blower motor (C), and the dust and pollen
filter (D) can be replaced without removing the
blower unit.
• Before reassembly, make sure that the recirculation
control linkage and door move smoothly without
binding.
• After reassembly, make sure the recirculation control
motor runs smoothly (see page 21-57).
2. Remove the bolts and nut, then disconnect the
suction line (A) and the receiver line A (B) from the
evaporator core.
０１
B
A
０１
A
D
6 x 1.0 mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
8 x 1.25 mm
12.3 N·m
(1.3 kgf·m, 9.1 lbf·ft)
3. Remove the blower unit (see page 21-59).
C
B
4. Remove the self-tapping screws, the joint duct (A)
and the seal (B).
０２
B
A
21-60
ＳＪＣ８Ａ００Ｇ２４１１３６０００００ＫＢＡＴ００
ＳＪＣ８Ａ００Ｇ１０１２３６２５３１１ＫＢＡＴ８０
07/05/09 16:42:19 61SJC020_210_0062
5. Remove the bolts, inlet and outlet pipes (A), and
expansion valve (B).
7. Install the core in the reverse order of removal, and
note these items:
０３
• If you’re installing a new evaporator core, add
refrigerant oil (DENSO ND-OIL 8) (see page 21-6).
• Replace the O-rings with new ones at each fitting,
and apply a thin coat of refrigerant oil before
installing them. Be sure to use the correct O-rings
for HFC-134a (R-134a) to avoid leakage.
• Immediately after using the oil, reinstall the cap
on the container, and seal it to avoid moisture
absorption.
• Do not spill the refrigerant oil on the vehicle; it
may damage the paint; if the refrigerant oil
contacts the paint, wash it off immediately.
• Make sure that there is no air leakage.
• Charge the system (see page 21-75).
B
A
6. Carefully pull out the evaporator core (A) and the
plate (B).
０４
A
B
21-61
07/05/09 16:42:20 61SJC020_210_0063
Heating/Air Conditioning
Heater Unit/Core Replacement
SRS components are located in this area. Review the
SRS component locations (see page 24-14) and the
precautions and procedures (see page 24-16) before
repairing or servicing.
1. Make sure you have the anti-theft code for the
audio or the navigation system, then write down
the audio presets.
6. Slide the hose clamps (A) back. Remove the nut
and the water valve (B), then disconnect the inlet
heater hose (C) and the outlet heater hose (D) from
the heater unit. Engine coolant will run out when
the hoses are disconnected; drain it into a clean
drip pan. Be sure not to let coolant spill on the
electrical parts or the painted surfaces. If any
coolant spills, rinse it off immediately.
０２
D
2. Make sure the ignition is OFF, then disconnect the
negative cable from the battery.
3. Disconnect the suction and receiver lines from the
evaporator core (see page 21-60).
4. From under the hood, open the cable clamp (A),
then disconnect the heater valve cable (B) from the
heater valve arm (C). Turn the heater valve arm to
the fully opened position as shown.
０１
A
A
C
B
6 x 1.0 mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
7. Remove the mounting nut from the heater unit.
Take care not to damage or bend the fuel lines and
the brake lines, etc.
C
8 x 1.25 mm
12.3 N·m
(1.3 kgf·m, 9.1 lbf·ft)
B
5. When the engine is cool, drain the engine coolant
from the radiator (see page 10-6).
21-62
ＳＪＣ８Ａ００Ｇ２４１０００３１４６１ＫＢＡＴ８０
０３
07/05/09 16:42:21 61SJC020_210_0064
8. Remove the dashboard (see page 20-89).
9. Disconnect the connectors (A) from the blower
motor and the power transistor, then remove the
wire harness clips (B).
11. Disconnect the connectors (A) from the evaporator
sensor and the air mix control motor, then remove
the wire harness clips (B) and the wire harness (C).
０６
０４
A
C
B
A
12. Remove the mounting nuts and the blower-heater
unit (A).
B
０７
6 x 1.0 mm
9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
10. Disconnect the connectors (A) from the mode
control motor and the recirculation control motor,
then remove the wire harness clips (B).
０５
A
A
B
(cont’d)
21-63
07/05/09 16:42:22 61SJC020_210_0065
Heating/Air Conditioning
Heater Unit/Core Replacement (cont’d)
13. Remove the self-tapping screws, the joint duct (A),
and seal (B). Remove the self-tapping screws, then
remove the passenger’s heater outlet (C), and the
heater core cover (D). Remove the self-tapping
screws, the heater pipe brackets (E), the grommets
(F), and carefully pull out the heater core (G) so you
don’t bend the inlet and outlet pipes.
０８
C
D
A
B
G
F
E
21-64
14. Install the heater core in the reverse order of
removal.
15. Install the heater unit in the reverse order of
removal, and note these items:
• Do not interchange the inlet and outlet heater
hoses, and install the hose clamps securely.
• Refill the cooling system with engine coolant
(see page 10-6).
• Adjust the heater valve cable (see page 21-65).
• Make sure that there is no coolant leakage.
• Make sure that there is no air leakage.
• Refer to evaporator core replacement (see page
21-60).
• Reset the power window control unit (see page
22-209).
• Enter the anti-theft code for the audio or the
navigation system, then enter the audio presets.
• Set the clock.
07/05/09 16:42:22 61SJC020_210_0066
Heater Valve Cable Adjustment
1. From under the hood, open the cable clamp (A),
then disconnect the heater valve cable (B) from the
heater valve arm (C).
０１
A
5. From under the hood, turn the heater valve arm (A)
to the fully closed position as shown, and hold it.
Attach the heater valve cable (B) to the heater valve
arm, and gently pull on the heater valve cable
housing to take up any slack, then install the heater
valve cable housing into the cable clamp (C).
＊０１
C
C
A
B
2. From under the dash, disconnect the heater valve
cable housing from the cable clamp (A), and
disconnect the heater valve cable (B) from the air
mix control linkage (C).
B
０２
B
C
A
D
3. Set the temperature control dial to Max Cool (Lo)
with the ignition switch ON (II).
4. Attach the heater valve cable to the air mix control
linkage as shown step 2. Hold the end of the heater
valve cable housing against the stop (D), then snap
the heater valve cable housing into the cable clamp.
NOTE: Make sure the ring-end of the cable is
pushed all the way to the base of the pin on air mix
control linkage.
21-65
ＳＪＣ８Ａ００Ｇ２４１０００３１４７２ＭＢＡＴ８０
07/05/09 16:42:23 61SJC020_210_0067
Heating/Air Conditioning
A/C Compressor Replacement
NOTE: Do not install the A/C compressor into a system
unless you are completely sure that the system is free
of contamination. Installing the A/C compressor into a
contaminated system can result in premature A/C
compressor failure.
6. Disconnect the connector (A) from the A/C
compressor clutch. Remove the bolt and the nut,
then disconnect the suction hose (B) and the
discharge hose (C) from the A/C compressor. Plug
or cap the hoses immediately after disconnecting
them to avoid moisture and dust contamination.
1. If the A/C compressor is marginally operable, run
the engine at idle speed, and let the air
conditioning work for a few minutes, then shut the
engine off.
０２
6 x 1.0 mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
2. Recover the refrigerant with a recovery/recycling/
charging station (see page 21-73).
B
3. Make sure you have the anti-theft code for the
audio or the navigation system, then write down
the audio presets.
4. Remove the alternator (see page 4-34).
5. Disconnect the A/C condenser fan connector (A),
then remove the A/C compressor clutch connector
(B) and the wire harness clips (C). Loosen the lower
mounting bolt, then remove the upper mounting
bolts and the condenser fan shroud (D). Be careful
not to damage the radiator fins when removing the
condenser fan shroud.
０１
6 x 1.0 mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
C
A
7. Remove the mounting bolts and the A/C
compressor (A). Be careful not to damage the
radiator fins when removing the A/C compressor.
０１
A
D
C
A
8 x 1.25 mm
22 N·m
(2.2 kgf·m,
16 lbf·ft)
C
B
6 x 1.0 mm
9.8 N·m
(1.0 kgf·m, 7.2 lbf·ft)
21-66
ＳＪＣ８Ａ００Ｇ１０１１０１０００００ＫＢＡＴ００
07/05/09 16:42:23 61SJC020_210_0068
8. Install the compressor in the reverse order of
removal, and note these items:
• Inspect the A/C lines for any signs of
contamination.
• If you’re installing a new A/C compressor, you
must calculate the amount of refrigerant oil to be
removed from it (see page 21-6). A new A/C
compressor comes with a full charge of oil.
• Replace the O-rings with new ones at each fitting,
and apply a thin coat of refrigerant oil before
installing them. Be sure to use the correct O-rings
for HFC-134a (R-134a) to avoid leakage.
• Use refrigerant oil (DENSO ND-OIL 8) for
HFC-134a DENSO piston type A/C compressor
only.
• To avoid contamination, do not return the oil to
the container once dispensed, and never mix it
with other refrigerant oils.
• Immediately after using the oil, reinstall the cap
on the container, and seal it to avoid moisture
absorption.
• Do not spill the refrigerant oil on the vehicle; it
may damage the paint; if the refrigerant oil
contacts the paint, wash it off immediately.
• Charge the system (see page 21-75).
• Reset the power window control unit (see page
22-209).
• Enter the anti-theft code for the audio or the
navigation system, then enter the audio presets.
• Set the clock.
21-67
07/05/09 16:42:24 61SJC020_210_0069
Heating/Air Conditioning
A/C Compressor Clutch Check
1. Check the pressure plate for discoloration, peeling,
or other damage. If there is damage, replace the
clutch set (see page 21-69).
2. Check the pulley bearing play and drag by rotating
the pulley by hand. Replace the clutch set with a
new one if it is noisy or has excessive play/drag
(see page 21-69).
4. Check the resistance of the field coil. If resistance is
not within specifications, replace the field coil
(see page 21-69).
Field Coil Resistance:
3.9−4.3
at 68 °F (20 °C)
０３
０１
3. Measure the clearance between the pulley (A) and
the pressure plate (B) all the way around. If the
clearance is not within specified limits, remove the
pressure plate (see page 21-69) and add or remove
shims as needed to increase or decrease clearance.
Clearance:
0.35−0.60 mm (0.014−0.024 in.)
NOTE: The shims are available in three
thicknesses: 0.1 mm, 0.3 mm, and 0.5 mm.
０２
B
A
21-68
ＳＪＣ８Ａ００Ｇ１０１１０１１２０１１ＭＡＡＴ００
07/05/09 16:42:25 61SJC020_210_0070
A/C Compressor Clutch Overhaul
Special Tools Required
A/C clutch holder, Robinair 10204 or Kent-Moore
J37872, or Honda Tool and Equipment KMT-J33939,
commercially available
3. If you are replacing the field coil, remove the snap
ring (A) with snap ring pliers, then remove the
pulley (B). Be careful not to damage the pulley or
the A/C compressor.
０３
1. Remove the center bolt while holding the pressure
plate with a commercially available A/C clutch
holder (A).
A
＊０１
18 N·m
(1.8 kgf·m, 13 lbf·ft)
B
A
2. Remove the pressure plate (A) and shim(s) (B),
taking care not to lose the shim(s). If the clutch
needs adjustment, increase or decrease the
number and thickness of shims as necessary, then
reinstall the pressure plate, and recheck its
clearance (see page 21-68).
4. Remove the screw from the field coil ground
terminal (A), then remove the wire harness (B) and
the bracket (C). Disconnect the field coil connector
(D). Remove the snap ring (E) with snap ring pliers,
then remove the field coil (F). Be careful not to
damage the field coil or the A/C compressor.
０４
E
F
D
NOTE: The shims are available in three
thicknesses: 0.1 mm, 0.3 mm, and 0.5 mm.
A
０２
C
A
B
B
5. Reassemble the clutch in the reverse order of
disassembly, and note these items:
• Install the field coil with the wire side facing
down, and align the boss on the field coil with the
hole in the A/C compressor.
• Clean the pulley and A/C compressor sliding
surfaces with contact cleaner or other nonpetroleum solvent.
• Install new snap rings, note the installation
direction, and make sure they are fully seated in
the groove.
• Make sure that the pulley turns smoothly after it’s
reassembled.
• Route and clamp the wires properly or they can
be damaged by the pulley.
21-69
ＳＪＣ８Ａ００Ｇ１０１１０１１２０１１ＬＡＡＴ００
07/05/09 16:42:26 61SJC020_210_0071
Heating/Air Conditioning
A/C Compressor Relief Valve
Replacement
A/C Condenser Replacement
1. Recover the refrigerant with a recovery/recycling
charging station (see page 21-73).
1. Recover the refrigerant with a recovery/recycling/
charging station (see page 21-73).
2. Remove the relief valve (A) and the O-ring (B). Plug
the opening to keep foreign matter from entering
the system and the A/C compressor oil from
running out.
2. Remove the front bulkhead cover (see page 20-171).
3. Remove the bolt, then disconnect the receiver line
B (A) from the A/C condenser.
A
０１
6 x 1.0 mm
9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
B
A
13.2 N·m
(1.3 kgf·m, 9.7 lbf·ft)
3. Clean the mating surfaces.
4. Replace the O-ring with a new one, and apply a thin
coat of refrigerant oil before installing it.
5. Remove the plug, and install and tighten the relief
valve.
6. Charge the system (see page 21-75).
21-70
ＳＪＣ８Ａ００Ｇ１０１１０１１２０２１ＫＢＡＴ００
ＳＪＣ８Ａ００Ｇ１０１１０２０００００ＫＢＡＴ８０
０１
07/05/09 16:42:27 61SJC020_210_0072
4. Remove the bolts, then disconnect the discharge
hose (A) from the A/C condenser.
０２
6. Remove the clip (A), the bolts, and the A/C
condenser upper mount brackets (B).
A
０４
6 x 1.0 mm
9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
A
B
6 x 1.0 mm
9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
5. Remove the bolts, the radiator upper mount
brackets (A), and the hood opener bracket (B).
０３
6 x 1.0 mm
9.8 N·m (1.0 kgf·m, 7.2 lbf·ft)
7. Remove the A/C condenser (A) by lifting it up. Be
careful not to damage the radiator and A/C
condenser fins when removing the A/C condenser.
０５
B
A
A
(cont’d)
21-71
07/05/09 16:42:27 61SJC020_210_0073
Heating/Air Conditioning
A/C Condenser Replacement
(cont’d)
8. Install the A/C condenser in the reverse order of
removal, and note these items:
• If you’re installing a new A/C condenser, add
refrigerant oil (DENSO ND-OIL 8) (see page 21-6).
• Replace the O-rings with new ones at each fitting,
and apply a thin coat of refrigerant oil before
installing them. Be sure to use the correct O-rings
for HFC-134a (R-134a) to avoid leakage.
• Immediately after using the oil, reinstall the cap
on the container, and seal it to avoid moisture
absorption.
• Do not spill the refrigerant oil on the vehicle; it
may damage the paint; if the refrigerant oil
contacts the paint, wash it off immediately.
• Charge the system (see page 21-75).
Receiver/Dryer Desiccant
Replacement
NOTE: Install the receiver/dryer as quickly as possible
to prevent the system from absorbing moisture from
the air.
1. Remove the A/C condenser (see page 21-70).
2. Remove the cap (A) from the bottom of the A/C
condenser. Remove the O-ring (B) and the
desiccant (C).
０１
B
C
A
2.9 N·m
(0.3 kgf·m, 2.1 lbf·ft)
3. Install the receiver/dryer in the reverse order of
removal, and note these items:
• Replace the O-rings with new ones, and apply a
thin coat of refrigerant oil (DENSO ND-OIL 8)
before installing them. Be sure to use the correct
O-rings for HFC-134a (R-134a) to avoid leakage.
• Install the cap to the specified torque. It is made
of resin a can be easily stripped.
21-72
ＳＪＣ８Ａ００Ｇ１０１０００５０５５２ＫＢＡＴ００
07/05/09 16:42:27 61SJC020_210_0074
Refrigerant Recovery
• Air conditioning refrigerant or lubricant vapor
can irritate your eyes, nose, or throat.
• Be careful when connecting service equipment.
• Do not breathe refrigerant or vapor.
2. Measure the amount of refrigerant oil removed
from the A/C system after the recovery process is
completed. Be sure to put the same amount of new
refrigerant oil back into the A/C system before
charging.
NOTE:
• If accidental system discharge occurs, ventilate the
work area before resuming service.
• Additional health and safety information may be
obtained from the refrigerant and lubricant
manufacturers.
1. Connect an R-134a refrigerant recovery/recycling/
charging station (A) to the high-pressure service
port (B) and the low-pressure service port (C), as
shown, following the equipment manufacturer’s
instructions.
０１
A
C
B
21-73
ＳＪＣ８Ａ００Ｇ１０１０００５０６５１ＫＢＡＴ８１
07/05/09 16:42:27 61SJC020_210_0075
Heating/Air Conditioning
System Evacuation
• Air conditioning refrigerant or lubricant vapor
can irritate your eyes, nose, or throat.
• Be careful when connecting service equipment.
• Do not breathe refrigerant or vapor.
2. Connect an R-134a refrigerant recovery/recycling/
charging station (A) to the high-pressure service
port (B) and the low-pressure service port (C), as
shown, following the equipment manufacturer’s
instructions. Evacuate the system.
＊０１
A
NOTE:
• If accidental system discharge occurs, ventilate the
work area before resuming service.
• Additional health and safety information may be
obtained from the refrigerant and lubricant
manufacturers.
1. When an A/C system has been opened to the
atmosphere, such as during installation or repair, it
must be evacuated using an R-134a refrigerant
recovery/recycling/charging station. If the system
has been open for several days, the receiver/dryer
should be replaced, and the system should be
evacuated for several hours.
C
B
3. If the low-pressure does not reach more than
93.3 kPa (700 mmHg, 27.6 in.Hg) in 15 minutes,
there is probably a leak in the system. Partially
charge the system, and check for leaks (see step 3
on page 21-76).
21-74
ＳＪＣ８Ａ００Ｇ１０１０００５０６５１ＫＢＡＴ８２
07/05/09 16:42:28 61SJC020_210_0076
System Charging
2. Evacuate the system (see page 21-74).
• Air conditioning refrigerant or lubricant vapor
can irritate your eyes, nose, or throat.
• Be careful when connecting service equipment.
• Do not breathe refrigerant or vapor.
NOTE:
• If accidental system discharge occurs, ventilate the
work area before resuming service.
• Additional health and safety information may be
obtained from the refrigerant and lubricant
manufacturers.
1. Connect an R-134a refrigerant recovery/recycling/
charging station (A) to the high-pressure service
port (B) and the low-pressure service port (C), as
shown, following the equipment manufacturer’s
instructions.
3. Add the same amount of new refrigerant oil to the
system that was removed during recovery. Use
only DENSO ND-OIL 8 refrigerant oil.
4. Charge the system with the specified amount of
R-134a refrigerant. Do not overcharge the system;
the A/C compressor will be damaged.
Select the appropriate units of measure for your
refrigerant charging station.
Refrigerant Capacity:
600 to 650 g
0.6 to 0.65 kg
1.3 to 1.4 lbs
20.3 to 22.0 oz
5. Check for refrigerant leaks (see page 21-76).
＊０２
6. Check the system performance (see page 21-77).
A
C
B
21-75
ＳＪＣ８Ａ００Ｇ１０１０００５０６５１ＫＢＡＴ８３
07/05/09 16:42:28 61SJC020_210_0077
Heating/Air Conditioning
Refrigerant Leak Test
Special Tools Required
Leak detector, Honda Tool and Equipment YGK-H-10PM
or commercially available
2. Open the high pressure valve to charge the system
to the specified capacity, then close the supply
valve, and disconnect the charging station fittings.
Select the appropriate units of measurement for
your refrigerant charging station.
• Air conditioning refrigerant or lubricant vapor
can irritate your eyes, nose, or throat.
• Be careful when connecting service equipment.
• Do not breathe refrigerant or vapor.
NOTE:
• If accidental system discharge occurs, ventilate the
work area before resuming service.
• Additional health and safety information may be
obtained from the refrigerant and lubricant
manufacturers.
1. Connect an R-134a refrigerant recovery/recycling/
charging station (A) to the high-pressure service
port (B) and the low-pressure service port (C), as
shown, following the equipment manufacturer’s
instructions.
Refrigerant Capacity:
600 to 650 g
0.6 to 0.65 kg
1.3 to 1.4 lbs
20.3 to 22.0 oz
3. Check the system for leaks using an R-134a
refrigerant leak detector with an accuracy of 14 g
(0.5 oz) per year or better.
4. If you find leaks that require the system to be
opened (to repair or replace hoses, fittings, etc.), do
the refrigerant recovery.
5. After checking and repairing leaks, the system
must be evacuated.
０１
A
C
B
21-76
ＳＪＣ８Ａ００Ｇ１０１０００５０６５１ＦＥＡＴ８０
07/05/09 16:42:29 61SJC020_210_0078
A/C System Test
Performance Test
6. Test conditions:
• Air conditioning refrigerant or lubricant vapor
can irritate your eyes, nose, or throat.
• Be careful when connecting service equipment.
• Do not breathe refrigerant or vapor.
The performance test will help determine if the A/C
system is operating within specifications.
NOTE:
• If accidental system discharge occurs, ventilate the
work area before resuming service.
• Additional health and safety information may be
obtained from the refrigerant and lubricant
manufacturers.
•
•
•
•
Avoid direct sunlight.
Open hood.
Open front doors.
Set the temperature control dial to Max Cool, the
mode control switch to Vent, and the
recirculation control switch to Recirculate.
• Turn the A/C switch ON and the fan switch to
Max.
• Run the engine at 1,500 rpm.
• No driver or passengers in vehicle.
7. After running the air conditioning for 10 minutes
under the above test conditions, read the delivery
temperature from the thermometer in the center
vent, the intake temperature near the blower unit,
and the discharge (high) and suction (low)
pressures on the A/C gauges.
1. Connect an R-134a refrigerant recovery/recycling/
charging station to the high-pressure service port
and the low-pressure service port, following the
equipment manufacturer’s instructions.
2. Determine the relative humidity and air
temperature.
3. Open the glove box. Remove the damper and the
glove box stop on each side, then let the glove box
hang down (see page 20-85).
4. Insert a thermometer (A) in the center vent.
０１
A
B
5. Place a thermometer (B) near the blower unit’s
recirculation inlet duct.
(cont’d)
21-77
ＳＪＣ８Ａ００Ｇ１０１００００００００ＦＥＡＴ１０
07/05/09 16:42:29 61SJC020_210_0079
Heating/Air Conditioning
A/C System Test (cont’d)
8. Refer to the inspection data.
Inspection data
Example
Intake temperature (dry):
Intake temperature (wet):
Delivery temperature:
Delivery pressure:
Intake pressure:
Results:
Within normal range
０２
86 °F (30 °C) Humidity level 70 %
77.9 °F (25.5 °C)
62.0 °F (16.6 °C)
1,636 kPa (16.7 kgf/cm2) ［237 psi］
192 kPa (2.0 kgf/cm2) ［28 psi］
kPa
(kgf/cm2)
［psi］
300
(3.1)
［44］
HUMIDITY
LEVEL
80 %
200
(2.0)
kPa
［29］ (kgf/cm2)
［psi］
2,500
(25.5)
［363］
100
2,000
(1.0)
(20.4)
［15］ ［290］
INTAKE
PRESSURE
°F
(°C)
86
(30)
0
1,000
(10.2)
［145］
0
30 %
80 %
68
(20)
DELIVERY
TEMPERATURE
500
(5.1)
［73］
DELIVERY
PRESSURE
80 %
DELIVERY
PRESSURE
1,500
(15.3)
［218］
INTAKE
PRESSURE
30 %
30 %
50
(10)
DELIVERY
TEMPERATURE 0
68
(20)
21-78
86
95
77
(30)
(35)
(25)
INTAKE TEMPERATURE
104
(40)
°F
(°C)
07/05/09 16:42:29 61SJC020_210_0080
Pressure Test
Test results
Discharge
(high) pressure
abnormally
high
Related symptoms
After stopping A/C compressor, pressure
drops about 196 kPa (2.0 kgf/cm2, 28 psi)
quickly, and then falls gradually.
Reduced or no airflow through A/C
condenser.
Line to A/C condenser is excessively hot.
Discharge
pressure
abnormally
low
High and low-pressures are balanced soon
after stopping A/C compressor. Low side is
higher than normal.
Outlet of expansion valve is not frosted,
low-pressure gauge indicates vacuum.
Suction (low)
pressure
abnormally
low
Expansion valve is not frosted, and lowpressure line is not cold. Low-pressure
gauge indicates vacuum.
Discharge temperature is low, and the
airflow from vents is restricted.
Expansion valve is frosted.
Low-pressure hose and check joint are
cooler than the temperature around
evaporator.
Suction pressure is lowered when A/C
condenser is cooled by water.
High and low-pressures are equalized as
soon as the A/C compressor is stopped,
and both gauges fluctuate while running.
Suction
pressure
abnormally
high
Suction and
discharge
pressures
abnormally
high
Suction and
discharge
pressures
abnormally
low
Refrigerant
leaks
Reduced airflow through A/C condenser.
Low-pressure hose and metal end areas
are cooler than evaporator.
Temperature around expansion valve is
too low compared with that around
receiver/dryer.
A/C compressor clutch is dirty.
A/C compressor bolt(s) are dirty.
A/C compressor gasket is wet with oil.
A/C fitting is dirty.
Probable cause
Air in system
• Clogged condenser or
radiator fins
• A/C condenser or radiator
fan not working properly
Restricted flow of refrigerant
in system
• Faulty A/C compressor
discharge valve
• Faulty A/C compressor seal
• Faulty expansion valve
• Moisture in system
• Frozen expansion valve
(Moisture in system)
• Faulty expansion valve
Frozen evaporator
Clogged expansion valve
Expansion valve open too
long
Remedy
Recover, evacuate (see page 21-73), and
recharge with specified amount (see page
21-75).
• Clean.
• Check voltage and fan rpm.
• Check fan direction.
Restricted lines.
Replace the A/C compressor.
• Replace.
• Recover, evacuate, and recharge with
specified amount.
• Recover, evacuate, and recharge with
specified amount.
• Replace the expansion valve.
Run the fan with A/C compressor off, then
check evaporator temperature sensor.
Clean or replace.
Repair or replace.
Excessive refrigerant in
system
• Faulty gasket
• Faulty high-pressure valve
• Foreign particle stuck in
high-pressure valve
• Clogged A/C condenser or
radiator fins
• A/C condenser or radiator
fan not working properly
Recover, evacuate, and recharge with
specified amount.
Replace the A/C compressor.
Clogged or kinked lowpressure hose parts
Clogged high-pressure line
Repair or replace.
A/C compressor shaft seal
leaking
Leaking around bolt(s)
Gasket leaking
Leaking O-ring
Replace the A/C compressor.
• Clean.
• Check voltage and fan rpm.
• Check fan direction.
Repair or replace.
Tighten bolt(s) or replace A/C compressor.
Replace the A/C compressor.
Clean the A/C fitting and replace the O-ring.
21-79
07/05/09 16:42:31 61SJC020_210_0081
Climate Control
Component Location Index
＊０１
EVAPORATOR CORE
(Located-in the heater unit)
Replacement, page 21-60
SERVICE VALVE
(LOW-PRESSURE SIDE)
SERVICE VALVE
(HIGH-PRESSURE SIDE)
RECEIVER/DRYER DESICCANT
Replacement, page 21-72
A/C CONDENSER
Replacement, page 21-70
A/C COMPRESSOR
Replacement, page 21-66
Clutch Check, page 21-68
Clutch Overhaul, page 21-69
21-80
ＳＪＣ８ＡＨ７Ｇ１０５００００００００ＤＡＡＴ００
07/05/09 16:42:33 61SJC020_210_0082
＊０２
UNDER-HOOD FUSE/RELAY BOX
A/C COMPRESSOR CLUTCH RELAY
Test, page 22-75
BLOWER MOTOR RELAY
Test, page 22-75
AUXILIARY UNDER-HOOD RELAY BOX
A/C CONDENSER FAN RELAY
Test, page 22-75
RADIATOR FAN RELAY
Test, page 22-75
FAN CONTROL RELAY
Test, page 22-75
OUTSIDE AIR
TEMPERATURE SENSOR
Test, page 21-52
Replacement, page 21-52
RADIATOR FAN
A/C DIODE
PCM
A/C CONDENSER FAN
(Located under-dash,
taped to harness)
A/C PRESSURE SWITCH
(cont’d)
21-81
07/05/09 16:42:39 61SJC020_210_0083
Climate Control
Component Location Index (cont’d)
＊０３
HEATER VALVE CABLE
Adjustment, page 21-65
SUNLIGHT SENSOR
Test, page 21-134
Replacement, page 21-134
HEATER UNIT/CORE
Replacement, page 21-62
EVAPORATOR CORE
(Located-in the heater unit)
Replacement, page 21-60
MODE CONTROL MOTOR
Test, page 21-56
Replacement, page 21-56
BLOWER UNIT
Removal/Installation,
page 21-59
Component Replacement,
page 21-60
DUST AND POLLEN
FILTER
Replacement,
page 21-58
RECIRCULATION CONTROL MOTOR
Test, page 21-57
Replacement, page 21-57
PASSENGER’S AIR MIX
CONTROL MOTOR
Test, page 21-136
Replacement, page 21-137
DRIVER’S
AIR MIX CONTROL MOTOR
Test, page 21-135
Replacement, page 21-135
CLIMATE CONTROL UNIT
Removal/Installation, page 21-137
POWER TRANSISTOR
Test, page 21-54
EVAPORATOR TEMPERATURE SENSOR
Test, page 21-53
Replacement, page 21-53
IN-CAR TEMPERATURE SENSOR
Test, page 21-133
Replacement, page 21-133
21-82
07/05/09 16:42:39 61SJC020_210_0084
General Troubleshooting Information
How to Check for DTCs with the HDS
1. Make sure the ignition switch is OFF.
2. Connect the HDS to the data link connector (DLC) (A) located under the driver’s side of the dashboard.
０１
A
3. Turn the ignition switch ON (II).
4. Make sure the HDS communicates with the vehicle and the climate control unit. If it doesn’t, troubleshoot the DLC
circuit (see page 11-194).
5. Select HVAC/CLIMATE CONTROL in the BODY ELECTRICAL menu.
6. Select DTCs in the HVAC/CLIMATE CONTROL menu.
7. Check for DTCs. If any DTCs are indicated, write down the DTCs, then go to the indicated DTC troubleshooting. If
no DTCs are indicated, refer to symptom troubleshooting.
NOTE:
• After troubleshooting, clear the DTCs with the HDS.
• For specific operations, refer to the user’s manual that came with the HDS.
(cont’d)
21-83
ＳＪＣ８ＡＨ７Ｇ１０５０００１６７１１ＢＢＡＴ１０
07/05/09 16:42:40 61SJC020_210_0085
Climate Control
General Troubleshooting Information (cont’d)
How to Use the Self-diagnostic Function without the HDS
The climate control unit has a self-diagnostic function. To run the self-diagnostic function, do the following.
NOTE: Before troubleshooting the climate control system, refer to B-CAN System Diagnosis Test Mode A
Troubleshooting (see page 22-99), and the communication circuit self-diagnostic function test.
1. Turn the ignition switch OFF, and then ON (II).
2. Press and hold the OFF button. While holding the OFF button, press the recirculation button five times within
10 seconds. Release the OFF button, then the self-diagnostic begins. Wait for about one minute for the selfdiagnostic to complete.
NOTE: The blower motor will run various speeds regardless of what the panel is displaying.
０１
AUTO BUTTON
OFF BUTTON
TEMPERATURE INDICATOR
RECIRCULATION BUTTON
• If there is any problem in the system, the temperature indicator will light up the segment (A through Q)
corresponding to the error. The temperature indicator will then alternate every second between displaying ‘‘88’’ (all
segments lit) and the error code segment (A through Q). To determine the meaning of the DTC, refer to checking for
DTCs.
• If there are no problems detected, the segments will not illuminate, and the system will appear to be turned off.
Canceling the Self-diagnostic Function
3. Turn the ignition switch OFF to cancel the self-diagnostic function. After completing repair work, run the selfdiagnostic function again to make sure that there are no other malfunctions.
21-84
07/05/09 16:42:40 61SJC020_210_0086
Checking for DTCs
The temperature display indicates single or multiple DTCs. If indicator segments A, C, E, G, I, L, and O are on at the
same time, there may be an open in the common ground wire. If no DTCs are present, the indicator remains blank.
０２
DRIVER’S SIDE TEMPERATURE INDICATOR
C E
PASSENGER’S SIDE TEMPERATURE INDICATOR
L
B D
A
F
O
G
J
K I
DTC
(Temperature
Indicator
Segment)
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
M
P
H Q
N
Detection Item
An open in the in-car temperature sensor circuit (see page 21-101)
A short in the in-car temperature sensor circuit (see page 21-103)
An open in the outside air temperature sensor circuit (see page 21-104)
A short in the outside air temperature sensor circuit (see page 21-105)
An open in the sunlight sensor circuit (see page 21-106)
A short in the sunlight sensor circuit (see page 21-107)
An open in the evaporator temperature sensor circuit (see page 21-108)
A short in the evaporator temperature sensor circuit (see page 21-110)
An open in the driver’s air mix control motor circuit (see page 21-111)
A short in the driver’s air mix control motor circuit (see page 21-112)
A problem in the driver’s air mix control linkage, door, or motor (see page 21-113)
An open in the passenger’s air mix control motor circuit (see page 21-115)
A short in the passenger’s air mix control motor circuit (see page 21-116)
A problem in the passenger’s air mix control linkage, door, or motor (see page 21-117)
An open or short in the mode control motor circuit (see page 21-119)
A problem in the mode control linkage, doors, or motor (see page 21-121)
A problem in the blower motor circuit (see page 21-122)
(cont’d)
21-85
07/05/09 16:42:40 61SJC020_210_0087
Climate Control
General Troubleshooting Information (cont’d)
Displaying Sensor Inputs at the Climate Control Unit
The climate control unit has a mode that displays sensor inputs it receives. This mode shows you what the climate
control unit is receiving from each of the sensors, one at a time, and it can help you determine if a sensor is faulty.
Check these items before using the sensor input display mode
1. Turn the ignition switch ON (II), and check the recirculation door function; press the recirculation button to switch
from FRESH to RECIRC. The air volume and sound should change slightly.
2. Set the temperature control knob to the desired test temperature. When selecting the test temperature, note these
items:
• ‘‘Lo’’ temperature setting will default to MAX COOL, VENT, and RECIRC.
• ‘‘Hi’’ temperature setting will default to MAX HOT, FLOOR, and FRESH.
• 58 through 86 °F settings will use the automatic climate control logic.
3. Turn the ignition switch OFF.
To run the sensor input display mode, follow these steps
1. Turn the ignition switch OFF.
2. Press and hold both the AUTO and recirculation buttons, then start the engine.
3. After the engine starts, release the buttons. The display panel control unit will flash the sensor number and then
the value for that sensor. Record the value displayed.
4. To advance to the next sensor, press the recirculation button.
Sensor
1
2
3
4
5
6
7
8
9
Item
In-car Temperature
Outside Air Temperature
Solar Radiation Sensor Value: Dark = 00, Flashlight = 04, Cloudy =10, Sunny =65
Engine Coolant Temperature
Evaporator Outlet Air Temperature
Driver’s Air Mix Opening (Low value indicates cooler air distribution, higher
value indicates warmer air distribution)
Passenger’s Air Mix Opening (Low value indicates cooler air distribution,
higher value indicates warmer air distribution)
Vehicle Speed (Vehicle must be driven to display speed)
Driver’s Vent Temperature Air Out (TAO-Dr)
Displayed Value
°C
°C
10 kcal/m2·h
°C
°C
% of opening
% of opening
km/h
°C
NOTE:
• The sensor values will be displayed in degrees Celsius (°C) or an alphanumeric code. Use the chart to convert
the value to degrees Fahrenheit (°F).
• If the sensor value displays ‘‘Er’’ this indicates there is an open or short in the circuit or sensor. Check for DTCs
using the HDS, or refer to checking DTCs by DTC indication.
• If necessary, compare the sensor input display to a like, known-good vehicle under the same test conditions.
• If the sensor is out of the normal range, refer to the sensor test or substitute a known-good sensor, and recheck.
5. To cancel the sensor input display mode, press the AUTO button or turn the ignition switch OFF.
21-86
07/05/09 16:42:41 61SJC020_210_0088
Celsius to Fahrenheit Conversion Table
°C
°F
°C
°F
0
32
10
50
1
34
11
52
2
36
12
54
3
37
13
55
4
39
14
57
5
41
15
59
6
43
16
61
7
45
17
63
8
46
18
64
9
48
19
66
°C
50
51
52
53
54
55
56
57
58
59
°F
122
124
126
127
128
131
133
135
136
139
°C
60
61
62
63
64
65
66
67
68
69
°F
140
142
144
145
147
149
151
152
154
158
Alphanumeric Conversion Table
Display Reading
°C
(Alphanumeric)
A1 thru A9
−1 thru −9
B0 thru B9
−10 thru −19
C0 thru C9
−20 thru −29
D0 thru D9
−30 thru −39
E0 thru E9
−40 thru −49
F0 thru F9
―――
°C
20
21
22
23
24
25
26
27
28
29
°F
68
70
72
73
75
77
79
81
82
84
°C
30
31
32
33
34
35
36
37
38
39
°F
86
88
90
91
93
95
97
99
100
102
°C
°C
70
71
72
73
74
75
76
77
78
79
°F
158
160
162
163
165
167
169
170
172
174
°C
80
81
82
83
84
85
86
87
88
89
°F
176
178
180
181
183
185
187
188
190
192
°C
40
41
42
43
44
45
46
47
48
49
°F
104
106
108
109
111
113
115
117
118
120
90
91
92
93
94
95
96
97
98
99
°F
194
196
198
199
201
203
205
207
208
210
°F
%
30 thru 16
14 thru −2
−4 thru −20
−22 thru −38
−40 thru −58
―――
−1 thru −9
−10 thru −19
−20 thru −29
−30 thru −39
―――
＋100 thru ＋109
21-87
07/05/09 16:42:41 61SJC020_210_0089
Climate Control
DTC Troubleshooting Index
Checking the DTCs by HDS
DTC
Detection Item or Symptom
B1200
Communication bus line error
B1202
Climate control unit internal error
B1205
B1229
Climate control unit lost communication
with gauge control module
(VSP/NE message)
Climate control unit lost communication
with gauge control module
(ENGTEMP message)
Climate control unit lost communication
with gauge control module
(ILLUMI message)
An open in the in-car temperature sensor
circuit
A short in the in-car temperature sensor
circuit
An open in the outside air temperature
sensor circuit
A short in the outside air temperature
sensor circuit
An open in the sunlight sensor circuit
B1230
A short in the sunlight sensor circuit
B1231
An open in the evaporator temperature
sensor circuit
A short in the evaporator temperature
sensor circuit
An open in the driver’s air mix control
motor circuit
A short in the driver’s air mix control
motor circuit
A problem in the driver’s air mix control
linkage, door, or motor
An open in the passenger’s air mix control
motor circuit
A short in the passenger’s air mix control
motor circuit
A problem in the passenger’s air mix
control linkage, door, or motor
An open or short in the mode control
motor circuit
A problem in the mode control linkage,
doors, or motor
A problem in the blower motor circuit
B1206
B1207
B1225
B1226
B1227
B1228
B1232
B1233
B1234
B1235
B1236
B1237
B1238
B1239
B1240
B1241
21-88
ＳＪＣ８ＡＨ７Ｇ１０５００００００００ＧＡＡＴ８０
ECU
Climate control
unit
Climate control
unit
Climate control
unit
DTC type
Loss of
communication
Internal error
Page
(see page 22-110)
Loss of
communication
(see page 21-100)
Climate control
unit
Loss of
communication
(see page 21-100)
Climate control
unit
Loss of
communication
(see page 21-100)
Climate control
unit
Climate control
unit
Climate control
unit
Climate control
unit
Climate control
unit
Climate control
unit
Climate control
unit
Climate control
unit
Climate control
unit
Climate control
unit
Climate control
unit
Climate control
unit
Climate control
unit
Climate control
unit
Climate control
unit
Climate control
unit
Climate control
unit
Signal error
(see page 21-101)
Signal error
(see page 21-103)
Signal error
(see page 21-104)
Signal error
(see page 21-105)
Signal error
(see page 21-106)
Signal error
(see page 21-107)
Signal error
(see page 21-108)
Signal error
(see page 21-110)
Signal error
(see page 21-111)
Signal error
(see page 21-112)
Signal error
(see page 21-113)
Signal error
(see page 21-115)
Signal error
(see page 21-116)
Signal error
(see page 21-117)
Signal error
(see page 21-119)
Signal error
(see page 21-121)
Signal error
(see page 21-122)
(see page 21-100)
07/05/09 16:42:41 61SJC020_210_0090
Symptom Troubleshooting Index
Symptom
Recirculation control doors do not
change between Fresh and
Recirculate
Diagnostic procedure
Recirculation control motor circuit
troubleshooting (see page 21-126)
Voice communication does not work
Navigation communication line circuit
troubleshooting (see page 21-128)
Climate control power and ground circuit
troubleshooting (see page 21-129)
Blower, heater controls, and A/C do
not work
Both fans do not run at low speed
with the A/C on (but the A/C
compressor runs with the A/C on)
Radiator and A/C condenser fan low speed circuit
troubleshooting (see page 21-40)
The A/C condenser fan does not run
at high speed (but both fans run at
low speed and the A/C compressor
operates with the A/C on)
A/C condenser fan high speed circuit
troubleshooting (see page 21-44)
Both fans do not run at high speed
with the A/C on (but both fans run at
low speed and the A/C compressor
operates with the A/C on)
Both fans run at high speed all the
time with the A/C on
Radiator and A/C condenser fan high speed
circuit troubleshooting (see page 21-46)
The A/C compressor clutch does not
engage (but both fans run with the
A/C on)
A/C compressor clutch circuit troubleshooting
(see page 21-47)
A/C system does not come on (both
fans and the A/C compressor do not
work); heater is OK
A/C pressure switch circuit troubleshooting
(see page 21-130)
Blower fan runs slower than
expected in cold weather
ECT Troubleshooting: ECT sensor 2 circuit low
voltage (see page 11-149), ECT sensor 2 circuit
high voltage (see page 11-151)
NOTE: It is normal for the blower to run slowly
until the engine coolant temperature begins to
rise. If the blower continues to run slowly for an
abnormal length of time, continue to troubleshoot
the problem.
Troubleshoot the DLC circuit (see page 11-194)
HDS does not communicate with the
climate control unit or the vehicle
Radiator and A/C condenser fan high speed
circuit troubleshooting (see page 21-46)
Also check for
• HVAC DTCs (see page 21-8)
• Blown fuse No. 30 (7.5 A) in the under-dash
fuse/relay box
• Cleanliness and tightness of all terminals
• HVAC DTCs (see page 21-8)
• Cleanliness and tightness of all terminals
• HVAC DTCs (see page 21-8)
• Blown fuse No. 30 (7.5 A) in the under-dash
fuse/relay box
• Poor ground at G402 (see page 22-68)
• Cleanliness and tightness of all terminals
• HVAC DTCs (see page 21-8)
• Blown fuse No. 20 (30 A) in the under-hood
fuse/relay box, and No. 30 (7.5 A) in the
under-dash fuse/relay box
• Poor ground at G201 (see page 22-68)
• Cleanliness and tightness of all terminals
• HVAC DTCs (see page 21-8)
• Blown fuse No. 30 (7.5 A) in the under-dash
fuse/relay box
• Poor ground at G201 (see page 22-68)
• Cleanliness and tightness of all terminals
• HVAC DTCs (see page 21-8)
• Poor ground at G202 (see page 22-68)
• Cleanliness and tightness of all terminals
•
•
•
•
•
•
•
•
•
•
HVAC DTCs (see page 21-8)
Poor ground at G202 (see page 22-68)
Cleanliness and tightness of all terminals
HVAC DTCs (see page 21-8)
Blown fuse No. 12 (7.5 A) in the under-hood
fuse/relay box, and No. 30 (7.5 A) in the
under-dash fuse/relay box
Cleanliness and tightness of all terminals
Body DTCs in B-CAN System Diagnosis Test
Mode A Troubleshooting (see page 22-99)
HVAC DTCs (see page 21-8)
Cleanliness and tightness of all terminals
Powertrain DTCs (see page 11-3)
21-89
ＳＪＣ８ＡＨ７Ｇ１０５００００００００ＨＢＡＴ０１
07/05/09 16:43:27 61SJC020_210_0091
Climate Control
System Description
The air conditioning system removes heat from the passenger compartment by transferring heat from the ambient air
to the evaporator. The evaporator cools the air with the refrigerant that is circulating through the evaporator. The
refrigerant expands in the evaporator, and the evaporator becomes very cold and absorbs the heat from the ambient
air. The blower fan pushes air across the evaporator where the heat is absorbed, and then it blows the cool air into the
passenger compartment.
＊０１
EXPANSION VALVE
(Meters the required amount of
refrigerant into the evaporator)
BLOWER FAN
EVAPORATOR
(Absorption of heat)
EVAPORATOR TEMPERATURE
SENSOR
RELIEF VALVE
(Relieves pressure at the A/C compressor
when the pressure is too high)
A/C PRESSURE SWITCH
(Triple function)
When the refrigerant is below
196 kPa (2.0 kgf/cm2, 28 psi)
or above 3,140 kPa (32 kgf/cm2,
455 psi), the PCM turns the
compressor relay off to protect
the A/C compressor.
When the refrigerant is above
1,550 kPa (15.5 kgf/cm2, 225 psi),
the A/C pressure sensor
switches the radiator and
A/C condenser fans to
high speed.
A/C COMPRESSOR
(Suction and compression)
HIGH PRESSURE VAPOR
HIGH PRESSURE LIQUID
A/C CONDENSER
(Radiation of heat)
RECEIVER/DRYER
DESICCANT
(Traps debris, and
removes moisture)
LOW PRESSURE LIQUID
LOW PRESSURE VAPOR
This vehicle uses HFC-134a (R-134a) refrigerant, which does not contain chlorofluorocarbons. Pay attention to the
following service items:
• Do not mix refrigerants CFC-12 (R-12) and HFC-134a (R-134a). They are not compatible.
• Use only the recommended polyalkyleneglycol (PAG) refrigerant oil (DENSO ND-OIL 8) designed for the R-134a A/C
compressor. Intermixing the recommended (PAG) refrigerant oil with any other refrigerant oil will result in A/C
compressor failure.
• All A/C system parts (A/C compressor, discharge line, suction line, evaporator, A/C condenser, receiver/dryer,
expansion valve, O-rings for joints) are designed for refrigerant R-134a. Do not exchange with R-12 parts.
• Use a halogen gas leak detector designed for refrigerant R-134a.
• R-12 and R-134a refrigerant servicing equipment are not interchangeable. Use only a recovery/recycling/charging
station that is U.L.-listed and is certified to meet the requirements of SAE J2210 to service the R-134a air
conditioning systems.
• Always recover refrigerant R-134a with an approved recovery/recycling/charging station before disconnecting any
A/C fitting.
21-90
ＳＪＣ８ＡＨ７Ｇ１０５００００００００ＣＡＡＴ８０
07/05/09 16:43:27 61SJC020_210_0092
A/C Pressure Switch
The A/C pressure switch consists of a high-low pressure switch (A/C pressure switch A) and a middle pressure switch
(A/C pressure switch B).
• High-low pressure switch
If the refrigerant pressure becomes too high (due to blockage or lack of airflow at the condenser), or too low (due to
leakage), the A/C pressure switch stops the A/C request signal to the PCM and the A/C compressor stops operating.
０２
590 kPa
(6.0 kgf/cm2, 86 psi)
29 kPa
(0.3 kgf/cm2, 4 psi)
ON
225 kPa
(2.3 kgf/cm2, 33 psi)
2,550 kPa
(26.0 kgf/cm2, 370 psi)
OFF
196 kPa
(2.0 kgf/cm2, 28 psi)
3,140 kPa
(32.0 kgf/cm2, 455 psi)
• Middle pressure switch
If the refrigerant pressure goes above 1,520 kPa (15.5 kgf/cm2, 221 psi), the A/C pressure switch closes to signal the
PCM to change the speed of the A/C condenser fan and radiator fan to high. When the refrigerant pressure drops
below 930 kPa (9.5 kgf/cm2, 135 psi), the A/C pressure switch opens to signal the PCM to change the speed of the A/C
condenser fan and radiator fan to low.
０３
590 kPa (6.0 kgf/cm2, 86 psi)
ON
1,520 kPa
(15.5 kgf/cm2, 221 psi)
OFF
930 kPa
(9.5 kgf/cm2, 135 psi)
HIGH-LOW
PRESSURE
SWITCH
MIDDLE
PRESSURE
SWITCH
(cont’d)
21-91
07/05/09 16:43:28 61SJC020_210_0093
Climate Control
System Description (cont’d)
Climate Control Door Positions
０１
COOL
HOT
DEFROSTER
DOOR
(VENT)
AIR MIX
DOOR
HEAT/VENT
DOOR
(HEAT/VENT)
(HEAT)
21-92
07/05/09 16:43:29 61SJC020_210_0094
０２
HOT
COOL
(HEAT/DEF)
(DEF)
(cont’d)
21-93
07/05/09 16:43:29 61SJC020_210_0095
Climate Control
System Description (cont’d)
Dual Air Mix Control System
０３
Driver’s side: HOT
Passenger’s side: COOL
DRIVER’S
AIR MIX DOOR
PASSENGER’S
AIR MIX DOOR
21-94
Driver’s side: COOL
Passenger’s side: HOT
07/05/09 16:43:30 61SJC020_210_0096
i-Dual Climate Control System
This system automatically controls the temperature and the vent mode for the driver and passenger’s sides depending
on the angle of the sun and the direction of the vehicle. The system receives information such as date, time, longitude,
and latitude from the navigation system, and it determines the irradiate strength of the sun from the sunlight sensor.
０４
NAVIGATION SYSTEM
SUNLIGHT SENSOR
DATE
LONGITUDE
LATITUDE
DIRECTION OF THE VEHICLE
IRRADIATE STRENGTH
CLIMATE CONTROL UNIT
DUAL AIR MIX CONTROL
DRIVER’S
AIR MIX DOORS
PASSENGER’S
AIR MIX DOORS
In the event that the navigation system malfunctions, or when driving in areas where the navigation cannot determine
the vehicle position (non-coverage areas, tunnels, etc.), the climate control system will operate the same as one in a
vehicle without navigation.
(cont’d)
21-95
07/05/09 16:43:30 61SJC020_210_0097
Climate Control
System Description (cont’d)
Climate Control Unit Inputs and Outputs
０５
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
Cavity
Wire color
1
BLK/YEL
2
WHT/BLU
3
RED/BLU
4
RED/YEL
5
YEL
6
PNK/BLK
7
BRN
8
LT BLU
9
PNK
10
ORN
11
BLU/RED
12
BLU/YEL
13
RED/BLK
14
RED
15
BLK
16
PNK/BLU
17
GRN
18
YEL/RED
19
YEL/BLU
20
YEL/BLK
21
LT GRN
22
RED/BLK
23
GRY
24
WHT/BLU
25
WHT/BLK
26
WHT/RED
27
GRN/WHT
28
GRN/RED
29
YEL
30
LT BLU
: With navigation system
21-96
Signal
IG2 (Power)
MODE 3
MODE 2
MODE 1
PASSENGER’S AIR MIX POTENTIAL
DRIVER’S AIR MIX POTENTIAL
EVAPORATOR TEMPERATURE SENSOR
IN-CAR TEMPERATURE SENSOR
OUTSIDE AIR TEMPERATURE SENSOR
SUNLIGHT SENSOR
BLOWER FEEDBACK
POWER TRANSISTOR CONTROL
TAILLIGHT RELAY
GAUGE ASSEMBLY
GROUND (G402)
DRIVER’S AIR MIX HOT
DRIVER’S AIR MIX COOL
MODE VENT
MODE DEF
PASSENGER’S AIR MIX COOL
PASSENGER’S AIR MIX HOT
SENSOR COMMON GROUND
AIR MIX POTENTIAL ＋5
NAVIGATION UNIT (SI)
NAVIGATION UNIT (CLK)
NAVIGATION UNIT (SO)
FRESH
RECIRCULATE
A/C PRESSURE SWITCH
B-CAN
INPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
OUTPUT
INPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
OUTPUT
INPUT
OUTPUT
INPUT
OUTPUT
OUTPUT
INPUT
INPUT
INPUT
INPUT/OUTPUT
07/05/09 16:43:30 61SJC020_210_0098
21-97
ＳＪＣ８Ａ０００００００００Ｊ２１０１ＺＡＡＴ０１
07/05/09 16:43:31 61SJC020_210_0099
Climate Control
Circuit Diagram
＊９０
UNDER−HOOD FUSE/RELAY BOX
BATTERY
No.22 (BAT) (120 A)
UNDER−DASH
FUSE/RELAY BOX
IGNITION SWITCH
No.23 (IG) (50 A)
BAT
G1
BLK/YEL
No.30 (7.5 A)
A4
WHT
N20
YEL
BLK/YEL
IG2
D7
BLK/YEL
IG2 HOT in ON (II)
No.23 (7.5 A)
PGM−FI
MAIN RELAY 1
D16
YEL/WHT
No.21 (40 A)
No.12 (7.5 A)
No.19 (30 A)
E7
No.20
(30 A)
D5
4
BLOWER
4 MOTOR RELAY
2
2
3
3
1
E9
F10
E15
E8
D1
BLK/YEL
BLU/RED
D2
YEL/GRN
A/C
COMPRESSOR
1 CLUTCH RELAY
RED
WHT/BLU
BLK
1
A/C
COMPRESSOR
CLUTCH
YEL
G202
YEL/WHT
2
2
A/C
CONDENSER
FAN MOTOR
4
A
A14
B
A/C
DIODE
ACC L
1
1
BLU/YEL
BLU/YEL
5V
3
YEL
TW
C27
RED/WHT
BLU/YEL
ENGINE COOLANT
TEMPERATURE
(ECT) SENSOR 1
BLU/YEL
WHT/RED
C14
FAN
CONTROL
5 RELAY
A/C
CONDENSER
1 FAN RELAY
1
GRN/YEL
4
RADIATOR
1 FAN RELAY
TW2
AUXILIARY
UNDER−HOOD
RELAY BOX
3
2
GRN
4
BLU/BLK
2
3
2
ENGINE COOLANT
TEMPERATURE
(ECT) SENSOR 2
4
C36
GRN/RED
GAUGE
CONTROL
MODULE
3
GRN/YEL BLU/BLK
GRN
A4
CAN
LO
A1
CAN
HI
A36
B1
RED
B6
B8
WHT
FAN LO
RELAY
CONTROL
MODULE *
H3
BLU/BLK
A5
BRN/YEL
J8
BLU
FAN HI
LT BLU
GRN
A/C
PRESSURE
SWITCH
BLU/RED
2
12 V
RADIATOR
FAN
MOTOR
PD SW
G201
G201
21-98
ＳＪＣ８ＡＨ７Ｇ１０５００００００００ＥＡＡＴ００
1
A37
3
B
2
RED/GRN
PCM
BLK
A
YEL
1
BLK
4
A/C PRESSURE SWITCH A :
The high−low switch opens when
the refrigerant pressure is below
196 kPa (2.0 kgf/cm2, 28 psi) or above
3,140 kPa (32.0 kgf/cm2, 455 psi)
A/C PRESSURE SWITCH B :
The middle switch closes when
the refrigerant pressure is above
1,520 kPa (15.5 kgf/cm2, 220 psi)
* : In the under−hood fuse/relay box
BLK
G202
07/05/09 16:43:32 61SJC020_210_0100
＊９０
: Communication line
WHT/BLU
BLK/YEL
BLK/YEL
WHT/BLU
1
1
BLOWER
MOTOR
2
BLU/BLK
12 V
POWER
TRANSISTOR
BLU/RED
13
TAILLIGHT
RELAY
12
RED/BLK
2
BLU/YEL
OUTSIDE AIR
TEMPERATURE SENSOR
1
2
LIGHTS
14
GAUGE
ASSEMBLY
9
PNK
RED
8
LT BLU
NAVIGATION UNIT
SO
WHT/RED
5V
7
25
RED/BLK
EVAPORATOR
TEMPERATURE SENSOR
1
2
26
A15
CLK
BRN
WHT/BLK
A4
RED/BLK
SUNLIGHT SENSOR
1
2
10
SI
ORN
24
4
RED/BLK
IN−CAR
TEMPERATURE SENSOR
1
2
5V
A14
3
1
11
RED/BLK
WHT/BLU
RED/BLK
23
7
S5V
GRY
(With navigation system)
6
3
PNK/BLK
16
2
PNK/BLU
17
1
GRN
AMD−P
M−HOT
M−COOL
S−COM
5
DRIVER’S
AIR MIX
CONTROL
MOTOR
RED/BLK
GRY
7
5
S5V
DRIVING
CIRCUIT
5
AMD−P
YEL
21
2
LT GRN
1
20
YEL/BLK
18
4
BLK
BLK/YEL
M−VENT
M−DEF
6
3
7
MODE1
RED/YEL
5
RED/BLU
3
2
MODE2
S−COM
MODE
CONTROL
MOTOR
4
WHT/BLU
YEL
RED/BLK
2
YEL/BLU
LT BLU
PASSENGER’S
M−HOT AIR MIX
CONTROL
MOTOR
M−COOL
1
YEL/RED
19
30
S−COM
3
MODE3
22
29
RED/BLK
27
5
GRN/WHT
28
7
GRN/RED
FRS RECIRCULATION
CONTROL
IG2
REC MOTOR
1
15
BLK
CLIMATE CONTROL UNIT
G402
21-99
07/05/09 16:43:33 61SJC020_210_0101
Climate Control
DTC Troubleshooting
DTC B1202: Climate Control Unit Internal
Error
NOTE:
• Check the battery condition (see page 22-74) and the
charging system (see page 4-26).
• If you are troubleshooting multiple DTCs, be sure to
follow the instructions in B-CAN system diagnosis
test mode A (see page 22-99).
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
DTC B1205: Climate Control Unit Lost
Communication with Gauge Control Module
(VSP/NE message)
DTC B1206: Climate Control Unit Lost
Communication with Gauge Control Module
(ECT message)
DTC B1207: Climate Control Unit Lost
Communication with Gauge Control Module
(ILLUMI message)
NOTE: If you are troubleshooting multiple DTCs, be
sure to follow the instructions in B-CAN system
diagnosis test mode A (see page 22-99).
3. Check for DTCs using the HDS.
1. Clear the DTC with the HDS.
Is DT C B1202 indicated?
YES−The climate control unit is faulty, replace the
control unit.
2. Operate the climate control system in several
modes.
3. Check for DTCs using the HDS.
NO−Intermittent failure, the climate control unit is
OK at this time.
Is DT C B1205, B1206 and/ or B1207 indicated?
YES−Go to step 4.
NO−Intermittent failure, the gauge control module
and climate control unit are OK at this time.
4. Check for DTCs using the HDS.
Is DT C B1060 or B2157 indicated?
YES−Perform the gauge control module input test
(see page 22-122).
NO−Go to step 5.
5. Turn the ignition switch OFF.
6. Disconnect the climate control unit 30P connector.
7. Remove the gauge control module (see page
22-263).
21-100
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２０２ＦＡＡＴ００
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２０５ＦＡＡＴ０２
07/05/09 16:43:33 61SJC020_210_0102
8. Check for continuity between the climate control
unit 30P connector No. 30 terminal and gauge
control module connector B (14P) No. 6 terminal.
＊０１
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
LT BLU
DTC B1225 or DTC indicator A: An Open in
the In-car Temperature Sensor Circuit
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
Is DT C B1225 or A indicated?
YES−Go to step 4.
BRN/YEL
NO−Intermittent failure, check for loose wires or
poor connections on the in-car temperature sensor
circuit.
GAUGE CONTROL MODULE CONNECTOR B (14P)
Wire side of female terminals
Is there continuity?
YES−Substitute a known-good HVAC or climate
control unit, then return to step 3 and recheck. If the
problem is still present, replace the gauge control
module (see page 22-263).
4. Turn the ignition switch OFF.
5. Remove the in-car temperature sensor (see page
21-133) and test it (see page 21-133).
Is the in-car temperature sensor OK ?
YES−Go to step 6.
NO−Replace the in-car temperature sensor.
NO−Repair open in the wire between the climate
control unit and gauge control module.
6. Disconnect the climate control unit 30P connector.
(cont’d)
21-101
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２２５ＦＡＡＴ００
07/05/09 16:43:33 61SJC020_210_0103
Climate Control
DTC Troubleshooting (cont’d)
7. Check for continuity between the climate control
unit 30P connector No. 8 terminal and the in-car
temperature sensor 2P connector No. 1 terminal.
０１
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
8. Check for continuity between the climate control
unit 30P connector No. 22 terminal and the in-car
temperature sensor 2P connector No. 2 terminal.
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
LT BLU
RED/BLK
RED/BLK
LT BLU
IN-CAR TEMPERATURE SENSOR 2P CONNECTOR
Wire side of female terminals
IN-CAR TEMPERATURE SENSOR 2P CONNECTOR
Wire side of female terminals
Is there continuity?
Is there continuity?
YES−Go to step 8.
YES−Check for loose wires or poor connections at
the climate control unit 30P connector and at the
in-car temperature sensor 2P connector. If the
connections are good, substitute a known-good
climate control unit, and recheck. If the symptom/
indication goes away, replace the original climate
control unit.
NO−Repair open in the wire between the climate
control unit and the in-car temperature sensor.
NO−Repair open in the wire between the climate
control unit and the in-car temperature sensor.
21-102
０２
07/05/09 16:43:34 61SJC020_210_0104
DTC B1226 or DTC indicator B: A Short in the
In-car Temperature Sensor Circuit
7. Check for continuity between body ground and the
climate control unit 30P connector No. 8 and No. 22
terminals.
０１
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
CLIMATE CONTROL UNIT 30P CONNECTOR
LT BLU
3. Check for DTCs using the HDS or self-diagnostic.
Is DT C B1226 or B indicated?
RED/BLK
YES−Go to step 4.
NO−Intermittent failure.
Wire side of female terminals
4. Turn the ignition switch OFF.
5. Remove the in-car temperature sensor (see page
21-133) and test it (see page 21-133).
Is the in-car temperature sensor OK ?
Is there continuity?
YES−Repair short to body ground in the wires
between the climate control unit and the in-car
temperature sensor.
YES−Go to step 6.
NO−Go to step 8.
NO−Replace the in-car temperature sensor.
6. Disconnect the climate control unit 30P connector.
8. Check for continuity between the climate control
unit 30P connector No. 8 and No. 22 terminals.
０２
CLIMATE CONTROL UNIT 30P CONNECTOR
LT BLU
RED/BLK
Wire side of female terminals
Is there continuity?
YES−Repair short in the wires between the climate
control unit and the in-car temperature sensor.
NO−Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
21-103
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２２６ＦＡＡＴ００
07/05/09 16:43:34 61SJC020_210_0105
Climate Control
DTC Troubleshooting (cont’d)
DTC B1227 or DTC indicator C: An Open in
the Outside Air Temperature Sensor Circuit
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
7. Check for continuity between the climate control
unit 30P connector No. 9 terminal and the outside
air temperature sensor 2P connector No. 2 terminal.
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
PNK
3. Check for DTCs using the HDS or self-diagnostic.
Is DT C B1227 or C indicated?
YES−Go to step 4.
NO−Intermittent failure, check for loose wires or
poor connections on the outside air temperature
sensor circuit.
PNK
OUTSIDE AIR TEMPERATURE SENSOR 2P CONNECTOR
Wire side of female terminals
4. Turn the ignition switch OFF.
Is there continuity?
5. Remove the outside air temperature sensor
(see page 21-52) and test it (see page 21-52).
YES−Go to step 8.
Is the outside air temperature sensor OK ?
NO−Repair open in the wire between the climate
control unit and the outside air temperature
sensor.
YES−Go to step 6.
NO−Replace the outside air temperature sensor.
6. Disconnect the climate control unit 30P connector.
21-104
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２２７ＦＡＡＴ００
０１
07/05/09 16:43:34 61SJC020_210_0106
8. Check for continuity between the climate control
unit 30P connector No. 22 terminal and the outside
air temperature sensor 2P connector No. 1 terminal.
０２
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
DTC B1228 or DTC indicator D: A Short in the
Outside Air Temperature Sensor Circuit
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
RED/BLK
Is DT C B1228 or D indicated?
RED/BLK
YES−Go to step 4.
NO−Intermittent failure.
OUTSIDE AIR TEMPERATURE SENSOR 2P CONNECTOR
Wire side of female terminals
Is there continuity?
YES−Check for loose wires or poor connections at
the climate control unit 30P connector and at the
outside air temperature sensor 2P connector. If the
connections are good, substitute a known-good
climate control unit, and recheck. If the symptom/
indication goes away, replace the original climate
control unit.
4. Turn the ignition switch OFF.
5. Remove the outside air temperature sensor
(see page 21-52) and test it (see page 21-52).
Is the outside air temperature sensor OK ?
YES−Go to step 6.
NO−Replace the outside air temperature sensor.
6. Disconnect the climate control unit 30P connector.
NO−Repair open in the wire between the climate
control unit and the outside air temperature
sensor.
(cont’d)
21-105
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２２８ＦＡＡＴ００
07/05/09 16:43:35 61SJC020_210_0107
Climate Control
DTC Troubleshooting (cont’d)
7. Check for continuity between body ground and the
climate control unit 30P connector No. 9 and No. 22
terminals.
０１
DTC B1229 or DTC indicator E: An Open in
the Sunlight Sensor Circuit
1. Clear the DTC with the HDS.
CLIMATE CONTROL UNIT 30P CONNECTOR
2. Operate the climate control system in several
modes.
PNK
3. Check for DTCs using the HDS or self-diagnostic.
RED/BLK
Is DT C B1229 or E indicated?
YES−Go to step 4.
Wire side of female terminals
NO−Intermittent failure, check for loose wires or
poor connections on the sunlight sensor circuit.
4. Turn the ignition switch OFF.
Is there continuity?
5. Disconnect the sunlight sensor 2P connector.
YES−Repair short to body ground in the wires
between the climate control unit and the outside air
temperature sensor.
6. Disconnect the climate control unit 30P connector.
NO−Go to step 8.
7. Check for continuity between the climate control
unit 40P connector No. 10 terminal and the sunlight
sensor 2P connector No. 1 terminal.
8. Check for continuity between the climate control
unit 30P connector No. 9 and No. 22 terminals.
０２
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
CLIMATE CONTROL UNIT 30P CONNECTOR
ORN
PNK
RED/BLK
ORN
SUNLIGHT SENSOR 2P CONNECTOR
Wire side of female terminals
Wire side of female terminals
Is there continuity?
Is there continuity?
YES−Go to step 8.
YES−Repair short in the wires between the climate
control unit and the outside air temperature
sensor.
NO−Repair open in the wire between the climate
control unit and the sunlight sensor.
NO−Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
21-106
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２２９ＦＡＡＴ００
０１
07/05/09 16:43:35 61SJC020_210_0108
8. Check for continuity between the climate control
unit 30P connector No. 22 terminal and the sunlight
sensor 2P connector No. 2 terminal.
０２
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
DTC B1230 or DTC indicator F: A Short in the
Sunlight Sensor Circuit
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
RED/BLK
Is DT C B1230 or F indicated?
RED/BLK
YES−Go to step 4.
NO−Intermittent failure.
SUNLIGHT SENSOR 2P CONNECTOR
Wire side of female terminals
4. Turn the ignition switch OFF.
Is there continuity?
5. Disconnect the sunlight sensor 2P connector.
YES−Go to step 9.
6. Disconnect the climate control unit 30P connector.
NO−Repair open in the wire between the climate
control unit and the sunlight sensor.
7. Check for continuity between body ground and the
climate control unit 30P connector No. 10 and
No. 22 terminals.
０１
9. Reconnect the sunlight sensor 2P connector.
10. Reconnect the climate control unit 30P connector.
CLIMATE CONTROL UNIT 30P CONNECTOR
11. Test the sunlight sensor (see page 21-134).
ORN
Is the sunlight sensor OK ?
YES−Check for loose wires or poor connections at
the climate control unit 30P connector and at the
sunlight sensor 2P connector. If the connections are
good, substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
NO−Replace the sunlight sensor (see page 21-134).
RED/BLK
Wire side of female terminals
Is there continuity?
YES−Repair short to body ground in the wires
between the climate control unit and the sunlight
sensor.
NO−Go to step 8.
(cont’d)
21-107
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２３０ＦＡＡＴ００
07/05/09 16:43:36 61SJC020_210_0109
Climate Control
DTC Troubleshooting (cont’d)
8. Check for continuity between the climate control
unit 30P connector No. 10 and No. 22 terminals.
DTC B1231 or DTC indicator G: An Open in
the Evaporator Temperature Sensor Circuit
０２
CLIMATE CONTROL UNIT 30P CONNECTOR
ORN
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
RED/BLK
Is DT C B1231 or G indicated?
YES−Go to step 4.
Wire side of female terminals
NO−Intermittent failure, check for loose wires or
poor connections on the evaporator temperature
sensor circuit.
Is there continuity?
4. Turn the ignition switch OFF.
YES−Repair short in the wires between the climate
control unit and the sunlight sensor.
5. Remove the evaporator temperature sensor
(see page 21-53) and test it (see page 21-53).
NO−Go to step 9.
Is the evaporator temperature sensor OK ?
9. Reconnect the sunlight sensor 2P connector.
YES−Go to step 6.
10. Reconnect the climate control unit 30P connector.
11. Test the sunlight sensor (see page 21-134).
NO−Replace the evaporator temperature
sensor.
Is the sunlight sensor OK ?
YES−Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
NO−Replace the sunlight sensor (see page 21-134).
21-108
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２３１ＦＡＡＴ００
07/05/09 16:43:36 61SJC020_210_0110
6. Disconnect the climate control unit 30P connector.
7. Check for continuity between the climate control
unit 30P connector No. 7 terminal and the
evaporator temperature sensor 2P connector No. 2
terminal.
０１
8. Check for continuity between the climate control
unit 30P connector No. 22 terminal and the
evaporator temperature sensor 2P connector No. 1
terminal.
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
BRN
RED/BLK
RED/BLK
BRN
EVAPORATOR TEMPERATURE SENSOR 2P CONNECTOR
Wire side of female terminals
EVAPORATOR TEMPERATURE SENSOR 2P CONNECTOR
Wire side of female terminals
Is there continuity?
YES−Go to step 8.
NO−Repair open in the wire between the climate
control unit and the evaporator temperature
sensor.
Is there continuity?
YES−Check for loose wires or poor connections at
the climate control unit 30P connector and at the
evaporator temperature sensor 2P connector. If the
connections are good, substitute a known-good
climate control unit, and recheck. If the symptom/
indication goes away, replace the original climate
control unit.
NO−Repair open in the wire between the climate
control unit and the evaporator temperature
sensor.
21-109
０２
07/05/09 16:43:36 61SJC020_210_0111
Climate Control
DTC Troubleshooting (cont’d)
DTC B1232 or DTC indicator H: A Short in the
Evaporator Temperature Sensor Circuit
7. Check for continuity between body ground and the
climate control unit 30P connector No. 7 and No. 22
terminals.
０１
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
CLIMATE CONTROL UNIT 30P CONNECTOR
BRN
3. Check for DTCs using the HDS or self-diagnostic.
Is DT C B1232 or H indicated?
RED/BLK
YES−Go to step 4.
NO−Intermittent failure.
Wire side of female terminals
4. Turn the ignition switch OFF.
5. Remove the evaporator temperature sensor
(see page 21-53) and test it (see page 21-53).
Is the evaporator temperature sensor OK ?
Is there continuity?
YES−Repair short to body ground in the wire
between the climate control unit and the
evaporator temperature sensor.
YES−Go to step 6.
NO−Go to step 8.
NO−Replace the evaporator temperature
sensor.
8. Check for continuity between the climate control
unit 30P connector No. 7 and No. 22 terminals.
０２
6. Disconnect the climate control unit 30P connector.
CLIMATE CONTROL UNIT 30P CONNECTOR
BRN
RED/BLK
Wire side of female terminals
Is there continuity?
YES−Repair short in the wires between the climate
control unit and the evaporator temperature
sensor.
NO−Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
21-110
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２３２ＦＡＡＴ００
07/05/09 16:43:37 61SJC020_210_0112
DTC B1233 or DTC indicator I: An Open in the
Driver’s Air Mix Control Motor Circuit
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
Is DT C B1233 or I indicated?
8. Check for continuity between the following
terminals of the climate control unit 30P connector
and the driver’s air mix control motor 7P connector.
30P:
7P:
No. 6
No. 3
No. 22
No. 5
No. 23
No. 7
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
PNK/BLK
YES−Go to step 4.
NO−Intermittent failure, check for loose wires or
poor connections on the driver’s air mix control
motor circuit.
RED/
BLK
GRY
RED/BLK
GRY
4. Turn the ignition switch OFF.
PNK/BLK
5. Test the driver’s air mix control motor (see page
21-135).
DRIVER’S AIR MIX CONTROL MOTOR 7P CONNECTOR
Wire side of female terminals
Is the driver’s air mix control motor OK ?
Is there continuity?
YES−Go to step 6.
YES−Check for loose wires or poor connections at
the climate control unit 30P connector and at the
driver’s air mix control motor 7P connector. If the
connections are good, substitute a known-good
climate control unit and recheck. If the symptom/
indication goes away, replace the original climate
control unit.
NO−Replace the driver’s air mix control motor
(see page 21-135).
6. Disconnect the driver’s air mix control motor 7P
connector.
7. Disconnect the climate control unit 30P connector.
NO−Repair open in the wires between the climate
control unit and the driver’s air mix control
motor.
21-111
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２３３ＦＡＡＴ００
＊０１
07/05/09 16:43:37 61SJC020_210_0113
Climate Control
DTC Troubleshooting (cont’d)
DTC B1234 or DTC indicator J: A Short in the
Driver’s Air Mix Control Motor Circuit
8. Check for continuity between body ground and the
climate control unit 30P connector No. 6 and No. 23
terminals individually.
＊０１
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
CLIMATE CONTROL UNIT 30P CONNECTOR
PNK/BLK
3. Check for DTCs using the HDS or self-diagnostic.
GRY
Is DT C B1234 or J indicated?
YES−Go to step 4.
NO−Intermittent failure.
Wire side of female terminals
4. Turn the ignition switch OFF.
5. Test the driver’s air mix control motor (see page
21-135).
Is the driver’s air mix control motor OK ?
Is there continuity?
YES−Repair short to body ground in the wires
between the climate control unit and the driver’s air
mix control motor.
YES−Go to step 6.
NO−Go to step 9.
NO−Replace the driver’s air mix control motor
(see page 21-135).
6. Disconnect the driver’s air mix control motor 7P
connector.
9. Check for continuity between the climate control
unit 30P connector terminals as follows.
＊０２
CLIMATE CONTROL UNIT 30P CONNECTOR
7. Disconnect the climate control unit 30P connector.
PNK/BLK
GRY
Wire side of female terminals
Is there continuity?
YES−Repair the short in the wires.
NO−Go to step 10.
21-112
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２３４ＦＡＡＴ００
07/05/09 16:43:37 61SJC020_210_0114
10. Turn the ignition switch ON (II), and check the same
terminals for voltage to body ground.
＊０３
DTC B1235 or DTC indicator K: A Problem in
the Driver’s Air Mix Control Linkage, Door, or
Motor
CLIMATE CONTROL UNIT 30P CONNECTOR
1. Clear the DTC with the HDS.
PNK/BLK
2. Operate the climate control system in several
modes.
GRY
3. Check for DTCs using the HDS or self-diagnostic.
Is DT C B1235 or K indicated?
YES−Go to step 4.
Wire side of female terminals
Is there voltage?
YES−Repair short to power in the wire(s) between
the climate control unit and the driver’s air mix
control motor. This short may also damage the
climate control unit. Repair the short to power
before replacing the climate control unit.
NO−Intermittent failure, check for loose wires or
poor connections on the driver’s air mix control
motor circuit.
4. Turn the ignition switch OFF.
5. Test the driver’s air mix control motor (see page
21-135).
Is the driver’s air mix control motor OK ?
NO−Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
YES−Go to step 6.
NO−Replace the driver’s air mix control motor
(see page 21-135), or repair the driver’s air mix
control linkage or door.
6. Disconnect the driver’s air mix control motor 7P
connector.
7. Disconnect the climate control unit 30P connector.
(cont’d)
21-113
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２３５ＦＡＡＴ００
07/05/09 16:43:38 61SJC020_210_0115
Climate Control
DTC Troubleshooting (cont’d)
8. Check for continuity between the following
terminals of climate control unit 30P connector and
the driver’s air mix control motor 7P connector.
30P:
7P:
No. 16
No. 2
No. 17
No. 1
＊０１
9. Check for continuity between body ground and
climate control unit 30P connector No. 16 and
No. 17 terminals individually.
＊０２
HVAC CONTROL UNIT 30P CONNECTOR
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
PNK/BLU
PNK/BLU
GRN
GRN
PNK/BLU
DRIVER’S AIR MIX CONTROL MOTOR 7P CONNECTOR
Wire side of female terminals
Is there continuity?
YES−Go to step 9.
NO−Repair open in the wire(s) between the
climate control unit and the driver’s air mix control
motor.
21-114
GRN
Wire side of female terminals
Is there continuity?
YES−Repair short to body ground in the wire(s)
between the climate control unit and the driver’s air
mix control motor.
NO−Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
07/05/09 16:43:38 61SJC020_210_0116
DTC B1236 or DTC indicator L: An Open in
the Passenger’s Air Mix Control Motor Circuit
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
Is DT C B1236 or L indicated?
8. Check for continuity between following terminals
of the climate control unit 30P connector and the
passenger’s air mix control motor 7P connector.
30P:
7P:
No. 5
No. 3
No. 22
No. 5
No. 23
No. 7
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
YEL
YES−Go to step 4.
GRY
NO−Intermittent failure, check for loose wires or
poor connections on the passenger’s air mix
control motor circuit.
RED/BLK
RED/BLK
4. Turn the ignition switch OFF.
GRY
5. Test the passenger’s air mix control motor
(see page 21-136).
YEL
PASSENGER’S AIR MIX CONTROL MOTOR 7P CONNECTOR
Wire side of female terminals
Is the passenger’s air mix control motor OK ?
Is there continuity?
YES−Go to step 6.
NO−Replace the passenger’s air mix control motor
(see page 21-137).
6. Disconnect the passenger’s air mix control motor
7P connector.
YES−Check for loose wires or poor connections at
the climate control unit 30P connector and at the
passenger’s air mix control motor 7P connector. If
the connections are good, substitute a known-good
climate control unit, and recheck. If the symptom/
indication goes away, replace the original climate
control unit.
7. Disconnect the climate control unit 30P connector.
NO−Repair open in the wires between the climate
control unit and the passenger’s air mix control
motor.
21-115
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２３６ＦＡＡＴ００
＊０１
07/05/09 16:43:39 61SJC020_210_0117
Climate Control
DTC Troubleshooting (cont’d)
DTC B1237 or DTC indicator M: A Short in the
Passenger’s Air Mix Control Motor Circuit
8. Check for continuity between body ground and the
climate control unit 30P connector No. 5 and No. 23
terminals individually.
＊０１
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
CLIMATE CONTROL UNIT 30P CONNECTOR
YEL
3. Check for DTCs using the HDS or self-diagnostic.
GRY
Is DT C B1237 or M indicated?
YES−Go to step 4.
NO−Intermittent failure.
Wire side of female terminals
4. Turn the ignition switch OFF.
5. Test the passenger’s air mix control motor
(see page 21-136).
Is the passenger’s air mix control motor OK ?
Is there continuity?
YES−Repair short to body ground in the wires
between the climate control unit and the
passenger’s air mix control motor.
YES−Go to step 6.
NO−Go to step 9.
NO−Replace the passenger’s air mix control motor
(see page 21-137).
6. Disconnect the passenger’s air mix control motor
7P connector.
9. Check for continuity between the climate control
unit 30P connector terminals as follows.
＊０２
CLIMATE CONTROL UNIT 30P CONNECTOR
7. Disconnect the climate control unit 30P connector.
YEL
GRY
Wire side of female terminals
Is there continuity?
YES−Repair the short in the wires.
NO−Go to step 10.
21-116
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２３７ＦＡＡＴ００
07/05/09 16:43:39 61SJC020_210_0118
10. Turn the ignition switch ON (II), and check the same
terminals for voltage to body ground.
＊０３
DTC B1238 or DTC indicator N: A Problem in
the Passenger’s Air Mix Control Linkage,
Door, or Motor
CLIMATE CONTROL UNIT 30P CONNECTOR
1. Clear the DTC with the HDS.
YEL
2. Operate the climate control system in several
modes.
GRY
3. Check for DTCs using the HDS or self-diagnostic.
Is DT C B1238 or N indicated?
YES−Go to step 4.
Wire side of female terminals
Is there voltage?
YES−Repair short to power in the wire(s) between
the climate control unit and the passenger’s air mix
control motor. This short may also damage the
climate control unit. Repair the short to power
before replacing the climate control unit.
NO−Intermittent failure, check for loose wires or
poor connections on the passenger’s control motor
circuit.
4. Turn the ignition switch OFF.
5. Test the passenger’s air mix control motor
(see page 21-136).
Is the passenger’s air mix control motor OK ?
NO−Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
YES−Go to step 6.
NO−Replace the passenger’s air mix control motor
(see page 21-137), or repair the passenger’s air mix
control linkage or door.
6. Disconnect the passenger’s air mix control motor
7P connector.
7. Disconnect the climate control unit 30P connector.
(cont’d)
21-117
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２３８ＦＡＡＴ００
07/05/09 16:43:39 61SJC020_210_0119
Climate Control
DTC Troubleshooting (cont’d)
8. Check for continuity between the following
terminals of climate control unit 30P connector
and the passenger’s air mix control motor 7P
connector.
30P:
7P:
No. 20
No. 1
No. 21
No. 2
＊０１
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
YEL/BLK
9. Check for continuity between body ground and
climate control unit 30P connector No. 20 and
No. 21 terminals individually.
＊０２
CLIMATE CONTROL UNIT 30P CONNECTOR
YEL/BLK
LT GRN
LT GRN
LT GRN
Wire side of female terminals
Is there continuity?
YEL/BLK
PASSENGER’S AIR MIX CONTROL MOTOR 7P CONNECTOR
Wire side of female terminals
YES−Repair short to body ground in the wire(s)
between the climate control unit and the
passenger’s air mix control motor.
Is there continuity?
YES−Go to step 9.
NO−Repair open in the wire(s) between the
climate control unit and the passenger’s air mix
control motor.
21-118
NO−Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
07/05/09 16:43:40 61SJC020_210_0120
DTC B1239 or DTC indicator O: An Open or
Short in the Mode Control Motor Circuit
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
8. Check for continuity between the following
terminals of climate control unit 30P connector and
the mode control motor 7P connector.
30P:
7P:
No. 2
No. 4
No. 3
No. 3
No. 3
No. 5
No. 4
No. 6
No. 22
No. 7
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
Is DT C B1239 or O indicated?
YES−Go to step 4.
NO−Intermittent failure, check for loose wires or
poor connections on the mode control motor
circuit.
RED/BLU
WHT/
BLU
RED/YEL
RED/BLK
4. Turn the ignition switch OFF.
5. Test the mode control motor (see page 21-56).
WHT/
BLU
Is the mode control motor OK ?
RED/BLK
YES−Go to step 6.
RED/BLU
NO−Replace the mode control motor (see page
21-56).
6. Disconnect the mode control motor 7P connector.
RED/YEL
RED/BLU
MODE CONTROL MOTOR 7P CONNECTOR
Wire side of female terminals
Is there continuity?
7. Disconnect the climate control unit 30P connector.
YES−Go to step 9.
NO−Repair open in the wires between the climate
control unit and the mode control motor.
(cont’d)
21-119
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２３９ＦＡＡＴ００
＊０３
07/05/09 16:44:16 61SJC020_210_0121
Climate Control
DTC Troubleshooting (cont’d)
9. Check for continuity between body ground and the
climate control unit 30P connector No. 2, 3, 4, and
22 terminals individually.
＊０１
CLIMATE CONTROL UNIT 30P CONNECTOR
RED/BLU
WHT/
BLU
11. Turn the ignition switch ON (II), and check the same
terminals for voltage to body ground.
CLIMATE CONTROL UNIT 30P CONNECTOR
RED/BLU
WHT/
BLU
RED/YEL
RED/YEL
RED/BLK
RED/BLK
Wire side of female terminals
Wire side of female terminals
Is there any voltage?
Is there continuity?
YES−Repair short to body ground in the wires
between the climate control unit and the mode
control motor.
YES−Repair short to power in the wires between
the climate control unit and the mode control motor.
This short may also damage the climate control
unit. Repair the short to power before replacing the
climate control unit.
NO−Go to step 10.
10. Check for continuity between the climate control
unit 30P connector terminals as follows.
From terminal
2
3
4
To terminals
3, 4, 22
4, 22
18, 22
Is there continuity?
YES−Repair the short in the wires.
NO−Go to step 11.
21-120
NO−Check for loose wires or poor connections at
the climate control unit 30P connector and at the
mode control motor 7P connector. If the
connections are good, substitute a known-good
climate control unit, and recheck. If the symptom/
indication goes away, replace the original climate
control unit.
＊０２
07/05/09 16:44:16 61SJC020_210_0122
DTC B1240 or DTC indicator P: A Problem in
the Mode Control Linkage, Doors, or Motor
1. Clear the DTC with the HDS.
2. Operate the climate control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
8. Check for continuity between the following
terminals of climate control unit 30P connector and
the front mode control motor 7P connector.
30P:
7P:
No. 18
No. 1
No. 19
No. 2
＊０１
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
Is DT C B1240 or P indicated?
YES−Go to step 4.
NO−Intermittent failure, check for loose wires or
poor connections on the mode control motor
circuit.
4. Turn the ignition switch OFF.
5. Test the mode control motor (see page 21-56).
YEL/RED
YEL/BLU
YEL/BLU
YEL/RED
MODE CONTROL MOTOR 7P CONNECTOR
Wire side of female terminals
Is the mode control motor OK ?
Is there continuity?
YES−Go to step 6.
YES−Go to step 9.
NO−Replace the mode control motor (see page
21-56), or repair the mode control linkage or
doors.
NO−Repair open in the wire(s) between the
climate control unit and the mode control motor.
6. Disconnect the front mode control motor 7P
connector.
7. Disconnect the climate control unit 30P connector.
(cont’d)
21-121
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２４０ＦＡＡＴ００
07/05/09 16:44:17 61SJC020_210_0123
Climate Control
DTC Troubleshooting (cont’d)
9. Check for continuity between body ground and
climate control unit 30P connector No. 18 and
No. 19 terminals individually.
＊０２
DTC B1241 or DTC indicator Q: A Problem in
the Blower Motor Circuit
1. Clear the DTC with the HDS.
CLIMATE CONTROL UNIT 30P CONNECTOR
2. Operate the climate control system in several
modes.
3. Check for DTCs using the HDS or self-diagnostic.
YEL/RED
YEL/BLU
Is DT C B1241 or Q indicated?
YES−Go to step 4.
Wire side of female terminals
NO−Intermittent failure, check for loose wires or
poor connections on the blower motor circuit.
4. Turn the ignition switch OFF.
Is there continuity?
YES−Repair short to body ground in the wire(s)
between the climate control unit and the front
mode control motor.
5. Check the No. 21 (40 A) fuse in the under-hood
fuse/relay box, and the No. 30 (7.5 A) fuse in the
under-dash fuse/relay box.
Are the f uses OK ?
NO−Substitute a known-good climate control unit,
and recheck. If the symptom/indication goes away,
replace the original climate control unit.
YES−Go to step 6.
NO−Replace the fuses, and recheck. If the fuses
blow again, check for a short in the No. 21 (40 A)
and No. 30 (7.5 A) fuses circuit.
6. Connect the blower motor 2P connector No. 2
terminal to body ground with a jumper wire.
＊０１
BLOWER MOTOR 2P CONNECTOR
BLU/BLK
JUMPER WIRE
Wire side of female terminals
7. Turn the ignition switch ON (II).
Does the blower motor run?
YES−Go to step 8.
NO−Go to step 23.
21-122
ＳＪＣ８ＡＨ７Ｋ７１１０００Ｙ１２４１ＦＡＡＴ００
07/05/09 16:44:17 61SJC020_210_0124
13. Turn the ignition switch ON (II).
8. Turn the ignition switch OFF.
Does the blower motor run at high speed?
9. Disconnect the jumper wire.
10. Disconnect the power transistor 4P connector.
YES−Go to step 14.
11. Check for continuity between the power transistor
4P connector No. 4 terminal and body ground.
NO−Repair open in the BLU/BLK wire between the
power transistor and the blower motor.
０２
POWER TRANSISTOR 4P CONNECTOR
14. Turn the ignition switch OFF.
15. Disconnect the jumper wire.
16. Disconnect the climate control unit 30P connector.
BLK
17. Check for continuity between body ground and the
climate control unit 30P connector No. 11 and
No. 12 terminals individually.
０４
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
BLU/RED
Is there continuity?
BLU/
YEL
YES−Go to step 12.
NO−Check for an open in the wire between the
power transistor and body ground. If the wire is OK,
check for poor ground at G402 (see page 22-68).
Wire side of female terminals
12. Connect the power transistor 4P connector No. 3
and No. 4 terminals with a jumper wire.
０３
Is there continuity?
POWER TRANSISTOR 4P CONNECTOR
YES−Repair short to body ground in the wires
between the climate control unit and the power
transistor.
NO−Go to step 18.
BLU/BLK
BLK
JUMPER WIRE
Wire side of female terminals
(cont’d)
21-123
07/05/09 16:44:18 61SJC020_210_0125
Climate Control
DTC Troubleshooting (cont’d)
18. Check for continuity between the following
terminals of the climate control unit 30P connector
and the power transistor 4P connector.
30P:
4P:
No. 11
No. 1
No. 12
No. 2
０５
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
BLU/
YEL
BLU/RED
21. Reconnect the climate control unit 30P connector.
22. Test the power transistor (see page 21-54).
Is the power transistor OK ?
YES−Check for loose wires or poor connections at
the climate control unit 30P connector and at the
power transistor 4P connector. If the connections
are good, substitute a known-good climate control
unit, and recheck. If the symptom/indication goes
away, replace the original climate control unit.
NO−Replace the power transistor.
BLU/RED
BLU/YEL
23. Disconnect the jumper wire.
24. Disconnect the blower motor 2P connector.
POWER TRANSISTOR 4P CONNECTOR
Wire side of female terminals
25. Measure the voltage between the blower motor 2P
connector No. 1 terminal and body ground.
０７
Is there continuity?
BLOWER MOTOR 2P CONNECTOR
YES−Go to step 19.
NO−Repair open in the wires between the climate
control unit and the power transistor.
WHT/BLU
19. Start the engine.
20. Measure the voltage between body ground and the
climate control unit 30P connector No. 11 and
No. 12 terminals individually.
０６
Wire side of female terminals
CLIMATE CONTROL UNIT 30P CONNECTOR
BLU/RED
BLU/
YEL
Is there battery voltage?
YES−Replace the blower motor.
NO−Go to step 26.
26. Turn the ignition switch OFF.
Wire side of female terminals
27. Remove the blower motor relay from the underhood fuse/relay box, and test it (see page 22-75).
Is the relay OK ?
Is there voltage?
YES−Go to step 28.
YES−Repair short to power in the wires.
NO−Replace the blower motor relay.
NO−Go to step 21.
21-124
07/05/09 16:44:18 61SJC020_210_0126
28. Measure the voltage between the blower motor
relay 4P socket No. 2 terminal and body ground.
０８
BLOWER MOTOR RELAY 4P SOCKET
31. Turn the ignition switch OFF.
32. Check for continuity between the blower motor
relay 4P socket No. 3 terminal and body ground.
１０
BLOWER MOTOR RELAY 4P SOCKET
BLK
Is there battery voltage?
YES−Go to step 29.
Is there continuity?
NO−Replace the under-hood fuse/relay box
(see page 22-72).
YES−Repair open in the WHT/BLU wire between
the blower motor relay and the blower motor.
29. Turn the ignition switch ON (II).
30. Measure the voltage between the blower motor
relay 4P socket No. 4 terminal and body ground.
NO−Check for an open in the wire between the
blower motor relay and body ground. If the wire is
OK, check for poor ground at G202 (see page 22-68).
０９
BLOWER MOTOR RELAY 4P SOCKET
BLK/YEL
Is there battery voltage?
YES−Go to step 31.
NO−Repair open in the wire between the No. 30
(7.5 A) fuse in the under-dash fuse/relay box and
the blower motor relay.
21-125
07/05/09 16:44:19 61SJC020_210_0127
Climate Control
Recirculation Control Motor Circuit Troubleshooting
1. Check the No. 30 (7.5 A) fuse in the under-dash
fuse/relay box.
Is the f use OK ?
5. Turn the ignition switch OFF.
6. Test the recirculation control motor (see page
21-57).
YES−Go to step 2.
Is the recirculation control motor OK ?
NO−Replace the fuse, and recheck. If the fuse
blows again, check for a short in the No. 30 (7.5 A)
fuse circuit.
YES−Go to step 7.
2. Disconnect the recirculation control motor 7P
connector.
NO−Replace the recirculation control motor
(see page 21-57), or repair the recirculation control
linkage or door.
7. Disconnect the climate control unit 30P connector.
3. Turn the ignition switch ON (II).
4. Measure the voltage between the recirculation
control motor 7P connector No. 1 terminal and
body ground.
０１
8. Check for continuity between body ground and the
climate control unit 30P connector No. 27 and
No. 28 terminals individually.
０１
CLIMATE CONTROL UNIT 30P CONNECTOR
RECIRCULATION CONTROL MOTOR 7P CONNECTOR
GRN/WHT
GRN/RED
BLK/YEL
Wire side of female terminals
Wire side of female terminals
Is there continuity?
Is there battery voltage?
YES−Go to step 5.
YES−Repair short to body ground in the wires
between the climate control unit and the
recirculation control motor.
NO−Repair open in the wire between the No. 30
(7.5 A) fuse in the under-dash fuse/relay box and
the recirculation control motor.
NO−Go to step 9.
21-126
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07/05/09 16:44:19 61SJC020_210_0128
9. Turn the ignition switch ON (II), and check the same
terminals for voltage to body ground.
０３
CLIMATE CONTROL UNIT 30P CONNECTOR
11. Check for continuity between the following
terminals of the climate control unit 30P connector
and the recirculation control motor 7P connector.
30P:
7P:
No. 27
No. 5
No. 28
No. 7
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
GRN/WHT
GRN/RED
GRN/WHT
GRN/RED
Wire side of female terminals
GRN/WHT
Is there any voltage?
GRN/RED
YES−Repair short to power in the wires between
the climate control unit and the recirculation
control motor. This short may also damage the
climate control unit. Repair the short to power
before replacing the climate control unit.
NO−Go to step 10.
10. Turn the ignition switch OFF.
RECIRCULATION CONTROL MOTOR 7P CONNECTOR
Wire side of female terminals
Is there continuity?
YES−Check for loose wires or poor connections at
the climate control unit 30P connector and at the
recirculation control motor 7P connector. If the
connections are good, substitute a known-good
climate control unit, and recheck. If the symptom/
indication goes away, replace the original climate
control unit.
NO−Repair open in the wires between the climate
control unit and the recirculation control motor.
21-127
０４
07/05/09 16:44:20 61SJC020_210_0129
Climate Control
Navigation Communication Line Circuit Troubleshooting
1. Disconnect navigation unit connector A (20P).
2. Disconnect the climate control unit 30P connector.
4. Check for continuity between body ground and the
climate control unit 30P connector No. 24, 25, and
26 terminals individually.
０２
3. Check for continuity between the following
terminals of the climate control unit 30P connector
and navigation unit connector A (20P).
30P
20P
No. 24
No. 4
No. 25
No. 15
No. 26
No. 14
０１
CLIMATE CONTROL UNIT 30P CONNECTOR
WHT/BLU
WHT/RED
WHT/BLK
CLIMATE CONTROL UNIT 30P CONNECTOR
Wire side of female terminals
Wire side of female terminals
WHT/BLU
WHT/RED
WHT/BLK
WHT/BLU
WHT/RED
Is there continuity?
YES−Repair short to body ground in the wires
between the climate control unit and the navigation
unit.
WHT/BLK
NAVIGATION UNIT CONNECTOR A (20P)
Wire side of female terminals
Is there continuity?
YES−Go to step 4.
NO−Check for loose wires or poor connections at
the climate control unit 30P connector and at the
navigation unit connector A (20P). If the
connections are good, substitute a known-good
climate control unit and/or navigation unit, and
recheck. If the symptom/indication goes away,
replace the original climate control unit and/or
navigation unit.
NO−Repair open in the wires between the climate
control unit and the navigation unit.
21-128
ＳＪＣ８ＡＨ７Ｇ１０５０００１６６８５ＦＡＡＴ００
07/05/09 16:44:20 61SJC020_210_0130
Climate Control Power and Ground Circuit Troubleshooting
1. Check the No. 30 (7.5 A) fuse in the under-dash
fuse/relay box.
Is the f use OK ?
5. Turn the ignition switch OFF.
6. Check for continuity between the climate control
unit 30P connector No. 15 terminal and body
ground.
YES−Go to step 2.
NO−Replace the fuse, and recheck. If the fuse
blows again, check for a short in the No. 30 (7.5 A)
fuse circuit.
０２
CLIMATE CONTROL UNIT 30P CONNECTOR
2. Disconnect the climate control unit 30P connector.
BLK
3. Turn the ignition switch ON (II).
4. Measure the voltage between the climate control
unit 30P connector No. 1 terminal and body ground.
０１
Wire side of female terminals
CLIMATE CONTROL UNIT 30P CONNECTOR
BLK/YEL
Is there continuity?
YES−Check for loose wires and poor connections
at the climate control unit 30P connector. If
connections are good, substitute a known-good
climate control unit and recheck. If the symptom/
indication goes away, replace the original climate
control unit.
Wire side of female terminals
NO−Check for an open in the wire between the
climate control unit and body ground. If the wire is
OK, check for poor ground at G402 (see page 22-68).
Is there battery voltage?
YES−Go to step 5.
NO−Repair an open in the wire between the No. 30
(7.5 A) fuse in the under-dash fuse/relay box and
the climate control unit.
21-129
ＳＪＣ８ＡＨ７Ｇ１０５０００１６７０１ＦＡＡＴ００
07/05/09 16:44:21 61SJC020_210_0131
Climate Control
A/C Pressure Switch Circuit Troubleshooting
NOTE:
• Do not use this troubleshooting procedure if any of
the following items are operative; condenser fan,
radiator fan, A/C compressor. Refer to the symptom
troubleshooting index.
• Before doing any symptom troubleshooting, check
for powertrain DTCs (see page 11-3).
5. Connect the A/C pressure switch 4P connector
No. 4 terminal to body ground with the jumper wire.
０７
A/C PRESSURE SWITCH 4P CONNECTOR
1. Check for body DTCs using B-CAN system
diagnosis test mode A troubleshooting (see page
22-99).
BLU/RED
JUMPER WIRE
Are there any DT Cs indicated?
YES−Do the appropriate troubleshooting for the
DTC indicated.
NO−Go to step 2.
Wire side of female terminals
6. Start the engine
2. Disconnect the A/C pressure switch 4P connector.
Does the compressor and f ans come on?
3. Turn the ignition switch ON (II).
YES−Go to step 7.
4. Measure the voltage between the A/C pressure
switch 4P connector No. 4 terminal and body
ground.
NO−Check the connection of under-hood fuse/
relay box connector H (18P) No. 3 terminal. If the
connection is OK, replace the under-hood fuse/
relay box (see page 22-72).
０１
A/C PRESSURE SWITCH 4P CONNECTOR
7. Disconnect the jumper wire, and turn the ignition
switch OFF.
8. Check for continuity between the A/C pressure
switch No. 1 and No. 4 terminals.
０２
BLU/RED
A/C PRESSURE SWITCH
Wire side of female terminals
Is there 5 V or more?
YES−Go to step 5.
NO−Go to step 19.
Is there continuity?
YES−Go to step 9.
NO−Go to step 18.
21-130
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07/05/09 16:44:21 61SJC020_210_0132
9. Reconnect the A/C pressure switch 4P connector.
10. Disconnect climate control unit 30P connector.
14. Measure the evaporator temperature sensor
resistance between the climate control unit 30P
connector No. 7 and No. 22 terminals.
０４
11. Turn the ignition switch ON (II).
CLIMATE CONTROL UNIT 30P CONNECTOR
12. Measure the voltage between the climate control
unit 30P connector No. 29 terminal and body
ground.
BRN
０３
CLIMATE CONTROL UNIT 30P CONNECTOR
RED/BLK
YEL
Wire side of female terminals
Is the resistance less than 24 k
?
YES−Go to step 15.
Wire side of female terminals
NO−Test the evaporator temperature sensor
(see page 21-53).
Is there 5 V or more?
15. Reconnect the climate control unit 30P connector.
YES−Go to step 13.
16. Turn the ignition switch ON (II).
NO−Repair the open in the wire between the
climate control unit and the A/C pressure switch.
13. Turn the ignition switch OFF.
17. Check that blower motor operates at all speeds.
Does the blower motor operate at all speeds?
YES−Check for loose wires or poor connections at
the climate control unit 30P connector and at the
A/C pressure switch 4P connector. If the
connections are good, substitute a known-good
climate control unit and recheck. If the symptom/
indication goes away, replace the original climate
control unit.
NO−Repair the problem in the blower motor
circuit.
(cont’d)
21-131
07/05/09 16:44:21 61SJC020_210_0133
Climate Control
A/C Pressure Switch Circuit Troubleshooting (cont’d)
18. Check for proper A/C system pressure.
Is the pressure within specif ications?
21. Reconnect under-hood relay box connector H (18P).
22. Connect the A/C pressure switch connector No. 4
terminal to body ground with a jumper wire.
YES−Replace the A/C pressure switch.
NO−Repair the A/C pressure problem.
０６
A/C PRESSURE SWITCH 4P CONNECTOR
19. Disconnect under-hood relay box connector H (18P).
20. Check for continuity between the A/C pressure
switch connector No. 4 terminal and under-hood
relay box connector H (18P) No. 3 terminal.
０５
BLU/RED
JUMPER WIRE
UNDER-HOOD RELAY BOX CONNECTOR H (18P)
Wire side of female terminals
BLU/RED
Wire side of female terminals
23. Start the engine.
Do the A/ C compressor and f ans come on?
YES−Replace the relay control module.
BLU/RED
A/C PRESSURE SWITCH 4P CONNECTOR
Wire side of female terminals
Is there continuity?
YES−Go to step 21.
NO−Repair open in the wire between the relay
control module and the A/C pressure switch.
21-132
NO−Check for loose wires or poor connections. If
the connections are good, check the grounds. If the
grounds are good, replace the relay control
module.
07/05/09 16:44:22 61SJC020_210_0134
In-car Temperature Sensor Test
In-car Temperature Sensor
Replacement
1. Remove the in-car temperature sensor (see page
21-133).
2. Test the in-car temperature sensor while holding it
in front of the dashboard center vent.
• Measure the resistance with the system set to
Max Cool.
• Measure the resistance with the system set to
Max Hot.
1. Remove the driver’s dashboard lower cover
(see page 20-83).
2. Remove the self-tapping screws and the in-car
temperature sensor (A) from the driver’s
dashboard lower cover (B).
０１
A
3. Compare the resistance reading between the No. 1
and No. 2 terminals of the in-car temperature
sensor with the specifications shown in the graph;
the resistance should be within the specifications.
＊０１
IN-CAR TEMPERATURE SENSOR
Terminal side of male terminals
12
11
10
9
8
RESISTANCE 7
6
(k )
5
4
3
2
1
B
3. Install the sensor in the reverse order of removal.
Be sure to connect the air hose securely.
14
−10
32 50 68 86 104 °F
0
10 20 30 40 °C
TEMPERATURE
4. If the resistance is not as specified, replace the incar temperature sensor (see page 21-133).
21-133
ＳＪＣ８ＡＨ７Ｇ１０５０００３５３０１ＦＥＡＴ００
ＳＪＣ８ＡＨ７Ｇ１０５０００３５３０１ＫＢＡＴ０２
07/05/09 16:44:22 61SJC020_210_0135
Climate Control
Sunlight Sensor Test
1. Remove the sunlight sensor (A) from the
dashboard.
０１
A
Sunlight Sensor Replacement
1. Remove the sunlight sensor (A) from the
dashboard, then disconnect the connector (B). Be
careful not to damage the sensor and the
dashboard.
A
B
ORN
RED/BLK
2. Turn the ignition switch ON (II). Measure the
voltage between the terminals with the (＋) probe
on the No. 1 terminal and the (−) probe on the
No. 2 terminal with the connector connected.
2. Install the sensor in the reverse order of removal.
NOTE: The voltage readings will not change under
the light of a flashlight or a fluorescent lamp.
Voltage should be:
• 3.6−3.7 V or more with the sensor out of direct
sunlight.
• 3.3−3.5 V or less with the sensor in direct
sunlight.
3. If the voltage is not as specified, replace the
sunlight sensor (see page 21-134).
21-134
ＳＪＣ８ＡＨ７Ｇ１０５０００５７４０１ＦＥＡＴ００
ＳＪＣ８ＡＨ７Ｇ１０５０００５７４０１ＫＢＡＴ０２
０１
07/05/09 16:44:23 61SJC020_210_0136
Driver’s Air Mix Control Motor Test
Driver’s Air Mix Control Motor
Replacement
NOTE: Before testing, check for HVAC DTCs (see page
21-8).
1. Remove the driver’s dashboard lower cover
(see page 20-83).
1. Disconnect the 7P connector from the driver’s air
mix control motor.
2. Remove the self-tapping screws and the duct (A).
０１
Incorrectly applying power and ground to
the driver’s air mix control motor will
damage it. Follow the instructions carefully.
A
2. Connect battery power to the No. 1 terminal of the
driver’s air mix control motor, and ground the No. 2
terminal; the driver’s air mix control motor should
run, and stop at Max Cool. If it doesn’t, reverse the
connections; the driver’s air mix control motor
should run, and stop at Max Hot. When the driver’s
air mix control motor stops running, disconnect
battery power immediately.
０１
DRIVER’S AIR MIX CONTROL MOTOR
3. Disconnect the 7P connector (A) from the driver’s
air mix control motor (B). Remove the self-tapping
screws and the driver’s air mix control motor from
the heater unit.
０２
3. If the driver’s air mix control motor did not run in
step 2, remove it, then check the driver’s air mix
control linkage and door for smooth movement.
• If the linkage and door move smoothly, replace
the driver’s air mix control motor (see page
21-135).
• If the linkage or door sticks or binds, repair them
as needed.
• If the driver’s air mix control motor runs
smoothly, go to step 4.
4. Measure the resistance between the No. 5 and
No. 7 terminals. It should be between 4.2 to 7.8 k
5. Reconnect the driver’s air mix control motor 7P
connector, then turn the ignition switch ON (II).
B
A
.
4. Install the motor in the reverse order of removal.
Make sure the pin on the motor is properly
engaged with the linkage. After installation, make
sure the motor runs smoothly.
6. Using the backprobe set, measure the voltage
between the No. 3 and No. 7 terminals.
Max Cool:
Max Hot:
About 0.5 V
About 4.5 V
7. If either the resistance or voltage readings are not
as specified, replace the driver’s air mix control
motor (see page 21-135).
21-135
ＳＪＣ８ＡＨ７Ｇ２４１０００１２７０１ＦＥＡＴ０１
ＳＪＣ８ＡＨ７Ｇ２４１０００１２７０１ＫＢＡＴ００
07/05/09 16:44:24 61SJC020_210_0137
Climate Control
Passenger’s Air Mix Control Motor Test
NOTE: Before testing, check for HVAC DTCs (see page
21-8).
1. Disconnect the 7P connector from the passenger’s
air mix control motor.
Incorrectly applying power and ground to
the passenger’s air mix control motor will
damage it. Follow the instructions carefully.
2. Connect battery power to the No. 1 terminal of the
passenger’s air mix control motor, and ground the
No. 2 terminal; the passenger’s air mix control
motor should run, and stop at Max Cool. If it
doesn’t, reverse the connections; the passenger’s
air mix control motor should run, and stop at Max
Hot. When the passenger’s air mix control motor
stops running, disconnect battery power
immediately.
4. Measure the resistance between the No. 5 and
No. 7 terminals. It should be between 4.2 to 7.8 k
.
5. Reconnect the passenger’s air mix control motor 7P
connector, then turn the ignition switch ON (II).
6. Using the backprobe set, measure the voltage
between the No. 3 and No. 7 terminals.
Max Cool:
Max Hot:
About 1.5 V
About 4.5 V
7. If either the resistance or voltage readings are not
as specified, replace the passenger’s air mix
control motor (see page 21-137).
０２
PASSENGER’S AIR MIX CONTROL MOTOR
3. If the passenger’s air mix control motor did not run
in step 2, remove it, then check the passenger’s air
mix control linkage and door for smooth
movement.
• If the linkage and door move smoothly, replace
the passenger’s air mix control motor (see page
21-137).
• If the linkage or door sticks or binds, repair them
as needed.
• If the passenger’s air mix control motor runs
smoothly, go to step 4.
21-136
ＳＪＣ８ＡＨ７Ｇ２４１０００１２７０１ＦＥＡＴ００
07/05/09 16:44:24 61SJC020_210_0138
Passenger’s Air Mix Control Motor
Replacement
1. Open the glove box. Remove the damper and the
glove box stop on each side, then let the glove box
hang down (see page 20-85).
Climate Control Unit Removal/
Installation
1. Remove the instrument panel (see page 20-81).
2. Remove the self-tapping screws and the climate
control unit (A).
０１
2. Disconnect the 7P connector (A) from the
passenger’s air mix control motor. Remove the
self-tapping screws and the passenger’s air mix
control motor (B) from the heater unit.
０３
A
A
B
3. Install the motor in the reverse order of removal.
Make sure the pin on the motor is properly
engaged with the linkage. After installation, make
sure the motor runs smoothly.
3. Install the control unit in the reverse order of
removal. After installation, operate the various
functions to see whether works properly.
4. Run the self-diagnostic function to confirm that
there are no problems in the system (see page
21-83).
21-137
ＳＪＣ８ＡＨ７Ｇ２４１０００１２７０１ＫＢＡＴ０２
ＳＪＣ８ＡＨ７Ｇ１０５０００１６７１１ＫＤＡＴ００