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Audi A8 2003 ➤
Auxiliary Heater - Edition 03.2008
No.
Control sequence
Possible cause of deviation
Continuation of sequence fol‐
lowing deviation
Auxiliary heater
• Shutoff signal from front op‐
erating and display unit ( Cli‐
matronic control unit -J255- )
(via data bus system; setting
is made on MMI)
•
Shutoff signal from radio re‐
ceiver -R64-
Additional heater
• Shutoff signal from front op‐
erating and display unit ( Cli‐
matronic control unit -J255- )
interrogation (via data bus
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•
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Shutoff signal
from
Vehicle
diagnostic, testing and infor‐
mation system -VAS 5051 A(via basic setting function)
Note
♦ In “auxiliary heating mode”, auxiliary/additional heater is de‐
activated automatically after max. 60 minutes by MMI or by
operating and display unit ( Climatronic control unit -J255- ).
Auxiliary heater/auxiliary ventilation operating time is set on
MMI (Multi Media Interface).
♦ If heater is in control interval when switched off, it cuts out
without burn-off and run-on.
♦ “Burn-off/run-on” sequence ⇒ page 110 .
No.
10
Control sequence
Burn-off
– Monitoring as for no. 2
• Metering pump -V54- off
•
Circulation pump -V55- off
•
Actuation of front operating
and display unit ( Climatronic
control unit -J255- ) off
•
Actuation of combustion air
blower -V6- at regulated volt‐
age
•
Actuation of glow plug with
flame monitor -Q8- (postglow, regulated)
•
Actuation of glow plug with
flame monitor -Q8- off
Possible cause of deviation
Continuation of sequence fol‐
lowing deviation
⇒ page 103
⇒ page 103
13. Functional description of auxiliary/additional heater
107