Download TROUBLESHOOTING

BE–75
BODY ELECTRICAL
–
AUDIO SYSTEM
BE1DD–02
TROUBLESHOOTING
NOTICE:
When replacing the internal mechanism (computer part) of the audio system, be careful that no part
of your body or clothing comes in contact with the terminals of the leads from the IC, etc. of the replacement part (spare part).
HINT:
This inspection procedure is a simple troubleshooting which should be carried out on the vehicle during system operation and was prepared on the assumption of system component troubles (except for the wires and
connectors, etc.).
Always inspect the part with trouble taking the following items into consideration.
Open or short circuit of the wire harness
Connector or terminal connection fault
Problem
Radio
Tape player
CD player
Power amplifier
Noise
No.
Radio not operating when power switch turned to ”ON”.
1
Display indicates when power switch turned to ”ON”, but no sound (including
”noise”) is produced.
2
Noise present, but AM – FM not operating.
3
Any speaker does not work.
4
Any AM or FM does not work.
5
Few preset turning bands.
5
Reception poor.
6
Sound quality poor.
7
Preset memory erased.
8
Cassette tape cannot be inserted.
9
Cassette tape inserted, but no power.
10
Power coming in, but tape player not operating.
11
Any speaker does not work.
12
Sound quality poor.
13
Tape jammed, malfunction with tape speed or auto–reverse.
14
Cassette tape will not eject.
15
CD cannot be inserted.
16
CD inserted, but no power.
17
Power coming in, but CD player not operating.
18
Sound jumps.
19
Sound quality poor (Volume faint).
20
Any speaker does not work.
21
CD will not be ejected.
22
No power coming in.
23
Power coming in, but power amplifier not operating.
24
Any speaker does not work.
25
Noise occurs
26
Noise produced by vibration or shock while driving.
27
Noise produced when engine starts.
28
The term ”AM” includes LW, MW and SW, and the term ”FW” includes UKW.
2003 MR2 (RM967U)
Author:
Date:
1515
BE–76
BODY ELECTRICAL
1
Radio
–
AUDIO SYSTEM
RADIO NOT OPERATING WHEN POWER SWITCH TURNED TO ”ON”
Is tape player operating normally?
YES
Radio assembly faulty.
NG
Replace fuse(s).
NG
Replace ACC relay (See page BE–10).
NO
Check if ACC and RADIO2 fuses are OK?
OK
Check if ACC relay is OK?
OK
Is power supplied to ACC terminal of power amplifier?
NO
ACC wire harness faulty.
YES
Check if ECU–B1 and RADIO1 fuses are OK?
NG
Replace fuse(s).
OK
Is power supplied to +B terminal of power amplifier?
NO
+B wire harness faulty.
YES
Check if GND (wire harness side) of power amplifier
grounded normally?
NG
GND faulty.
OK
Is power supplied to ACC terminal of radio assembly?
NO
Power amplifier or ACC wire harness faulty.
YES
Is power supplied to +B terminal of radio assembly?
NO
Power amplifier or +B wire harness faulty.
YES
Check if GND (wire harness side) to radio assembly is OK?
NG
GND faulty.
OK
Radio assembly faulty.
2003 MR2 (RM967U)
Author:
Date:
1516
BE–77
BODY ELECTRICAL
2
–
AUDIO SYSTEM
DISPLAY INDICATES WHEN POWER SWITCH TURNED TO ”ON”, BUT NO
SOUND (INCLUDING ”NOISE”) IS PRODUCED
Radio
Is tape player operating normally?
YES
Radio assembly faulty.
NG
Replace fuse(s).
NG
Replace ACC relay (See page BE–10).
NO
Check if ACC and RADIO2 fuses are OK?
OK
Check if ACC relay is OK?
OK
Is power supplied to ACC terminal of power amplifier?
NO
ACC wire harness faulty.
YES
Check if ECU–B1 and RADIO1 fuses are OK?
NG
Replace fuse(s).
OK
Is power supplied to +B terminal of power amplifier?
NO
+B wire harness faulty.
YES
Check if GND (wire harness side) of power amplifier
grounded normally?
NG
GND faulty.
OK
Is power supplied to ACC terminal of radio receiver?
NO
Power amplifier faulty.
YES
Is power supplied to +B terminal of radio receiver?
NO
Power amplifier faulty.
YES
Check if GND (wire harness side) of power amplifier
grounded normally?
NG
GND faulty.
OK
Does continuity exist in speaker wire harness?
NO
Speaker wire harness faulty.
YES
Temporarily install another speaker. Functions OK?
YES
Speaker faulty.
NO
Hiss noise from speaker?
YES
NO
Power amplifier faulty.
Recheck system after repair.
Radio assembly faulty. Recheck system after repair.
2003 MR2 (RM967U)
Author:
Date:
1517
BE–78
BODY ELECTRICAL
3
Radio
–
AUDIO SYSTEM
NOISE PRESENT, BUT AM–FM NOT OPERATING
Go to No.25
If radio side faulty.
4
Radio
Radio faulty.
ANY SPEAKER DOSE NOT WORK
Is tape player operating normally?
YES
Radio assembly faulty.
NO
Is hiss noise produced by non–functioning speaker?
YES
NO
Does continuity exist in speaker wire harness?
NO
Radio assembly faulty.
Recheck system after repair.
Speaker wire harness faulty.
YES
Temporarily install another speaker. Functions OK?
YES
Speaker faulty.
NO
Power amplifier faulty. Recheck system after repair.
2003 MR2 (RM967U)
Author:
Date:
1518
BE–79
BODY ELECTRICAL
5
Radio
–
AUDIO SYSTEM
ANY AM OR FM DOES NOR WORK FEW PRESET TUNING BANDS
Problem with radio wave signals or location?
YES
Poor signals, poor location.
NO
Is power for the antenna being output from the radio assembly?
YES
Radio assembly faulty.
NO
Are both AM and FM defective?
NO
YES
Go to No. 16
Is tape player operating normally?
YES
Radio assembly faulty.
NO
Temporarily install another speaker. Functions OK?
YES
Speaker faulty.
NO
Hiss noise from speaker?
NO
YES
Power amplifier faulty.
Recheck system after repair.
Radio assembly faulty. Recheck system after repair.
2003 MR2 (RM967U)
Author:
Date:
1519
BE–80
BODY ELECTRICAL
6
Radio
–
AUDIO SYSTEM
POOR RECEPTION
Is the condition bad in comparison with other vehicles?
YES
An electric wave environment is bad.
NO
Are there any additional installation parts?
(Window tint, telephone antenna, etc.)
YES
Does the condition get better if removing
additional installation parts?
YES
NO
Influence of additional installation parts.
Check if there is any scratch and breaking of a wire on the glass
antenna and the defogger pattern.
(visual check. tester)
(See page BE–67)
YES
Repair (See page BE–52).
NO
Take a measure for contact.
NO
Is the contact of the plug jack of the radio OK?
YES
Does the condition get better by using the outer antenna
(such as pillar antenna)?
NO
Check the radio.
YES
Is the contact of the antenna terminal on the glass surface and
the defogger terminal?
NO
Take a measure for contact.
YES
Is the continuity of the antenna cord OK?
NO
Replace the antenna cord.
YES
Check the grounding of the antenna, antenna cord,
choke coil and noise filter (See page BE–67).
NG
Grounding failure.
OK
Does the condition get better by replacing the choke coil?
YES
Replace the choke coil.
NO
Does the condition get better by replacing the antenna cord?
YES
Replace the antenna cord.
NO
Replace the glass.
2003 MR2 (RM967U)
Author:
Date:
1520
BE–81
BODY ELECTRICAL
7
Radio
–
AUDIO SYSTEM
SOUND QUALITY POOR
NO
Is sound quality always poor?
Is sound quality poor in certain
areas only?
YES
Poor signals, poor location.
NO
Is tape player operating normally?
YES
YES
NO
Radio assembly or power
amplifier faulty.
Is tape player operating normally?
Radio assembly faulty.
YES
Radio assembly faulty.
NO
NO
Is speaker properly installed?
Install properly.
YES
Temporarily install another speaker. Functions OK?
YES
Speaker faulty.
NO
Radio assembly or power amplifier faulty.
Recheck system after repair.
8
Radio
PRESET MEMORY DISAPPEARS
Can cassette tape be inserted in tape player?
YES
Radio assembly faulty.
NO
Check if ECU–B1 and RADIO1 fuses are OK?
NG
Replace fuse(s).
OK
Is power supplied to +B terminal of power amplifier?
NO
+B wire harness faulty.
NG
GND faulty.
NO
Power amplifier faulty.
NG
Power amplifier faulty.
YES
Check if GND (wire harness side) of power amplifier
grounded normally?
OK
Is power supplied to +B terminal of radio assembly?
YES
Check if GND (wire harness side) of radio assembly
grounded normally?
OK
Radio assembly faulty.
2003 MR2 (RM967U)
Author:
Date:
1521
BE–82
BODY ELECTRICAL
9
Tape Player
–
AUDIO SYSTEM
CASSETTE TAPE CANNOT BE INSERTED
Is there a foreign object inside tape player?
YES
Remove foreign object.
YES
Radio assembly faulty.
NG
Replace fuse(s).
NO
+B wire harness faulty.
NG
GND faulty.
NO
Power amplifier faulty.
NG
Power amplifier faulty.
NO
Is auto search button radio operating normally?
NO
Check if ECU–B1 and RADIO1 fuses are OK?
OK
Is power supplied to +B terminal of power amplifier?
YES
Check if GND (wire harness side) of power amplifier
grounded normally?
OK
Is power supplied to +B terminal of radio assembly?
YES
Check if GND (wire harness side) of radio assembly grounded
normally?
OK
Radio assembly faulty.
10
Tape Player
CASSETTE TAPE INSERTED, BUT NO POWER
Is radio operating normally?
YES
Radio assembly faulty.
NO
Check if ACC and RADIO2 fuses are OK?
OK
NG
Replace fuse(s).
NG
Check if ACC relay is OK?
Replace ACC relay (See page BE–10).
OK
Is power supplied to ACC terminal of power amplifier?
NO
ACC wire harness faulty.
YES
Check if ECU–B1 and RADIO1 fuses are OK?
NG
Replace fuse(s).
OK
Is power supplied to +B terminal of radio assembly?
NO
+B wire harness faulty.
YES
Is power supplied to ACC terminal of radio assembly?
NO
Power amplifier faulty.
YES
Radio assembly faulty.
2003 MR2 (RM967U)
Author:
Date:
1522
BE–83
BODY ELECTRICAL
11
Tape Player
–
AUDIO SYSTEM
POWER COMING IN, BUT TAPE PLAYER NOT OPERATING
Function OK if different cassette tape inserted?
YES
Cassette tape faulty.
NO
YES
Is radio operating normally?
Radio assembly faulty.
NO
Does continuity exist in speaker wire harness?
NO
Speaker wire harness faulty.
YES
Temporarily install another speaker.
Function OK?
YES
Speaker faulty.
NO
NO
Hiss noise from speaker?
Power amplifier faulty.
Recheck system after repair.
YES
Radio assembly faulty.
Recheck system after repair.
12
Tape Player
ANY SPEAKER DOES NOT WORK
Is radio operating normally?
YES
Radio assembly faulty.
NO
Is hiss noise produced by non–functioning speaker.
YES
Radio assembly faulty.
Recheck system after repair.
NO
Does continuity exist in speaker wire harness?
NO
Speaker wire harness faulty.
YES
Temporarily install another speaker.
Function OK?
YES
Speaker faulty.
NO
Radio assembly or power amplifier faulty.
2003 MR2 (RM967U)
Author:
Date:
1523
BE–84
BODY ELECTRICAL
13
Tape Player
–
AUDIO SYSTEM
SOUND QUALITY POOR (VOLUME FAINT)
Function OK if different cassette tape inserted?
YES
Cassette tape faulty.
NO
Operates normally after cleaning the heads?
YES
Head dirty.
NO
YES
Is radio operating normally?
Radio assembly faulty.
NO
NO
Is speaker properly installed?
Install properly.
YES
Temporarily install another speaker.
Function OK?
YES
Speaker faulty.
NO
Radio assembly faulty.
14
Tape Player
TAPE JAMMED, MALFUNCTION WITH TAPE SPEED OR AUTO–REVERSE
Function OK if different tape (less than 120 min.) is inserted?
YES
Cassette tape faulty.
YES
Remove foreign object.
YES
Head dirty.
NO
Is there a foreign object inside tape player?
NO
Operates normally after cleaning the heads?
NO
Radio assembly faulty.
2003 MR2 (RM967U)
Author:
Date:
1524
BE–85
BODY ELECTRICAL
15
Tape Player
–
AUDIO SYSTEM
CASSETTE TAPE WILL NOT BE EJECTED
NO
Is tape player operating normally?
Cassette tape jammed.
YES
YES
Is auto search button of radio operating normally?
Radio assembly faulty.
NO
NG
Check if ECU–B1 and RADIO1 fuses are OK?
Replace fuse(s).
OK
Is power supplied to +B terminal of power amplifier?
NO
+B wire harness faulty.
YES
NO
Is power supplied to +B terminal of radio receiver?
Power amplifier faulty.
YES
Radio assembly faulty.
16
CD Player
CD CANNOT BE INSERTED
YES
Is CD already inserted?
Eject CD.
NO
Is auto search button of radio operating
normally?
YES
Is power supplied to +B terminal
of CD player?
NO
Radio assembly
faulty.
YES
NO
Check if GND (wire harness
side) of CD player grounded
normally?
NG
OK
CD player faulty.
Check if ECU–B1 and RADIO1 fuses are OK?
NG
Replace fuse(s).
OK
NO
Is power supplied to +B terminal of power amplifier?
+B wire harness faulty.
YES
NG
Check if GND (wire harness side) of radio assembly
grounded normally?
OK
Radio assembly faulty.
2003 MR2 (RM967U)
Author:
Date:
1525
BE–86
BODY ELECTRICAL
17
CD Player
–
AUDIO SYSTEM
CD INSERTED, BUT NO POWER
YES
Is radio operating normally?
Is power supplied to ACC
terminal of CD player?
Radio assembly
faulty.
NO
YES
NO
CD player faulty.
NG
Check if ACC and RADIO2 fuses are OK?
Replace fuse(s).
OK
NG
Check if ACC relay is OK?
Replace ACC relay (See page BE–10).
OK
Is power supplied to ACC terminal of power amplifier?
NO
ACC wire harness faulty.
YES
Is power supplied to ACC terminal of radio assembly?
NO
Power amplifier faulty.
YES
Radio assembly faulty.
18
CD Player
POWER COMING IN, BUT CD PLAYER NOT OPERATING
NO
Is CD inserted with correct side up?
Insert correctly.
YES
YES
Function OK if different CD inserted?
CD faulty.
NO
Is radio operating normally?
YES
Is temperature inside cabin hot?
YES
NO
NO
Has sudden temperature change
occurred inside cabin?
YES
NO
Protective circuit in
operation.
Formation of
condensation
due to temp. changes.
CD player faulty.
Dose continuity exist in speaker wire harness?
NO
Speaker wire harness faulty.
YES
Temporarily install another speaker.
Functions OK?
YES
Speaker faulty.
NO
Hiss noise from speaker?
YES
NO
Power amplifier faulty.
Recheck system after repair.
Radio assembly faulty.
Recheck system after repair.
2003 MR2 (RM967U)
Author:
Date:
1526
BE–87
BODY ELECTRICAL
19
CD Player
–
AUDIO SYSTEM
SOUND JUMPS
Does sound jump only during strong vibration?
YES
Jumping caused by vibration.
NO
Is CD player properly installed?
NO
Install properly.
YES
Functions OK if different CD inserted?
YES
CD faulty.
YES
Dew condensation due to
temp. changes.
NO
Has sudden temperature change occurred inside cabin?
NO
CD player faulty.
20
CD Player
SOUND QUALITY POOR (VOLUME FAINT)
Function OK if different CD inserted?
YES
CD faulty.
NO
Is radio operating normally?
YES
CD player faulty.
NO
Is speaker property installed?
NO
Install properly.
YES
Temporarily install another speaker.
Functions OK?
YES
Speaker faulty.
NO
Radio assembly or CD player or power amplifier faulty.
2003 MR2 (RM967U)
Author:
Date:
1527
BE–88
BODY ELECTRICAL
21
CD Player
–
AUDIO SYSTEM
ANY SPEAKER DOES NOT WORK
YES
Is radio operating normally?
CD player faulty.
NO
YES
Is hiss noise produced by non–functioning speaker?
Radio assembly faulty.
Recheck system after repair.
NO
NO
Does continuity exist in speaker wire harness?
Speaker wire harness faulty.
YES
YES
Temporarily install another speaker.
Function OK?
Speaker faulty.
NO
Power amplifier faulty.
Recheck system after repair.
22
CD Player
Is auto search button of radio
operating normally?
CD WILL NOT BE EJECTED
YES
Is power supplied to +B terminal
of CD player?
NO
Radio assembly
faulty.
YES
NO
Check if ECU–B1 and RADIO1 fuses are OK?
CD player faulty.
NG
Replace fuse(s).
OK
Is power supplied to +B terminal of power amplifier?
NO
+B wire harness faulty.
YES
Is power supplied to +B terminal of radio receiver?
NO
Power amplifier faulty.
YES
Radio assembly faulty.
2003 MR2 (RM967U)
Author:
Date:
1528
BE–89
BODY ELECTRICAL
23
Power Amplifier
–
AUDIO SYSTEM
NO POWER COMING IN
Is tape player operating normally?
YES
Radio assembly faulty.
NO
Check if ACC and RADIO2 fuses are OK?
NG
Replace fuse(s).
OK
Check if ACC relay is OK?
NG
Replace ACC relay (See page BE–10).
OK
Is power supplied to ACC terminal of power amplifier?
NO
ACC wire harness faulty.
YES
Check if ECU–B1 and RADIO1 fuses are OK?
NG
Replace fuse(s).
OK
Is power supplied to +B terminal of power amplifier?
NO
+B wire harness faulty.
YES
Check if GND (wire harness side) of power amplifier
grounded normally?
NG
GND faulty.
OK
Is power supplied to ACC terminal of radio assembly?
NO
Power amplifier or wire harness faulty.
YES
Is power supplied to +B terminal of radio assembly?
NO
Power amplifier or wire harness faulty.
YES
Check if GND (wire harness side) of radio assembly
grounded normally?
NG
GND faulty.
OK
Radio assembly faulty.
2003 MR2 (RM967U)
Author:
Date:
1529
BE–90
BODY ELECTRICAL
24
Power Amplifier
–
AUDIO SYSTEM
POWER COMING IN, BUT WOOFER (POWER) AMPLIFIER NOT
OPERATING
Is tape player operating normally?
YES
Radio assembly faulty.
NO
Check if ACC and RADIO2 fuses are OK?
NG
Replace fuse(s).
OK
Check if ACC relay is OK?
NG
Replace ACC relay (See page BE–10).
OK
Is power supplied to ACC terminal of power amplifier?
NO
ACC wire harness faulty.
YES
Check if ECU–B1 and RADIO1 fuses are OK?
NG
Replace fuse(s).
OK
Is power supplied to +B terminal of power amplifier?
NO
+B wire harness faulty.
YES
NG
Check if GND (wire harness side) of power amplifier
grounded normally?
GND faulty.
OK
Is power supplied to ACC terminal of radio assembly?
NO
Power amplifier faulty.
YES
Is power supplied to +B terminal of radio assembly?
NO
Power amplifier faulty.
YES
NG
Check if GND (wire harness side) of radio assembly
grounded normally?
GND faulty.
OK
Is there continuity in speaker wire harness?
NO
Speaker wire harness faulty.
YES
Temporarily install another speaker. Functions OK?
YES
Speaker faulty.
NO
Hiss noise from speaker?
YES
NO
Power amplifier faulty.
Recheck system after repair.
Radio assembly faulty. Recheck system after repair.
2003 MR2 (RM967U)
Author:
Date:
1530
BE–91
BODY ELECTRICAL
25
Power Amplifier
–
AUDIO SYSTEM
ANY SPEAKER DOES NOT WORK
Is radio operating normally?
YES
CD player faulty.
NO
Is hiss noise produced by non–functioning speaker?
YES
Radio assembly faulty.
Recheck system after repair.
NO
Does continuity exist in speaker wire harness?
NO
Speaker wire harness faulty.
YES
Temporarily install another speaker.
Function OK?
YES
Speaker faulty.
NO
Power amplifier faulty.
Recheck system after repair.
2003 MR2 (RM967U)
Author:
Date:
1531
BE–92
BODY ELECTRICAL
26
Noise
–
AUDIO SYSTEM
NOISE OCCURS
Does the noise occur only in the radio?
NO
(It occurs in the cassette and CD.)
Refer to No.27.
YES
Does the noise occur in a particular place?
YES
An electric environment.
NO
Is there any additional installation part
around the glass imprinted antenna?
(Window tint, telephone antenna etc.)
YES
Does the noise stop by removing it?
Influence of the window tint or the noise radiation of the additional installation part.
NO
YES
Does the noise occur even after pulling out the
antenna cord from the radio?
Check the radio.
NO
YES
Does the noise occur even after pulling out the
antenna terminal on the glass surface?
Noise mixing into the antenna cable.
NO
Isn’t there any adhesive (Butyl rubber)stuck
on the bases of the antenna terminal,
defogger terminal and bus bar?
YES
Glass installation.
Remove the butyl rubber.
YES
Interfering noise from the defogger line
and choke coil.
NO
Does the noise occur even after pulling out
the defogger terminal?
NO
Check the grounding of the antenna,
antenna cord, choke coil and noise filter.
(See page BE–67)
NG
Grounding failure.
OK
YES
Does the condition get better by replacing
the choke coil?
Replace the choke coil.
NO
YES
Does the condition get better by replacing
the antenna cord.
Replace the antenna cord.
NO
Noise radiates directly from the generation source
to the antenna.
2003 MR2 (RM967U)
Author:
Date:
1532
BE–93
BODY ELECTRICAL
27
Noise
–
AUDIO SYSTEM
NOISE PRODUCED BY VIBRATION OR SHOCK WHILE DRIVING
NO
Is speaker properly installed?
Install properly.
YES
NO
Is each system correctly installed?
YES
YES
With vehicles stopped, lightly tap each system.
Is noise produced?
Each system faulty.
NO
Noise is produced from static electricity accumulating in the vehicle body.
28
Noise
NOISE PRODUCED WHEN ENGINE STARTS
Whistling noise which becomes high–pitched with
accelerator strongly depressed, has gone shortly after engine stops.
YES
Generator noise.
NO
Whining noise occurs when A/C is operating.
YES
A/C noise.
NO
Scratching noise occurs during sudden acceleration, driving on rough roads or when ignition switch is turned ON.
NO
Clicking sound is heard when horn button is pressed, then
released. Whirring/grating sound is heard when pushed
continuously.
YES
YES
Fuel gauge noise.
Horn noise.
NO
Murmuring sound stops when engine stops.
YES
Ignition noise.
NO
Tick–tack noise occurs in co–ordination with blinking
of flasher.
YES
Turn signal noise.
NO
Noise occurs during window washer operation.
YES
Washer noise.
NO
Scratching noise occurs while engine is running,
and continues a while even after engine stops.
YES
Engine coolant temp. gauge noise.
NO
Scraping noise in line with wiper beat.
YES
Wiper noise.
NO
Other type of noise
2003 MR2 (RM967U)
Author:
Date:
1533