Audi A8 1994 Service Manual page 15

Readout on VAS 5051
- No communication
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Readout on VAS 5051
01336
Group convenience system data bus
- Defective
- In one-wire operating mode
Readout on VAS 5051
01402
Data wire from navigation
- Implausible signal
65535
Control unit defective
Electrical system Self-diagnosis 02.99 ➤ - Edition 05.2002
Possible cause of trouble
- CAN bus fault
- Open circuit in wiring or short
- Wiring damage
- "1" not displayed in measured val‐
ue block 125 for engine control unit
=>Page 27
- Dash panel insert adaption not
performed correctly
- Automatic parking system control
unit -J446 defective
Possible cause of trouble
- CAN bus fault
- Open circuit in wiring or short at
control unit in convenience system
data bus
- "1" not displayed in measured val‐
ue blocks 125 to 131 for control unit
with CAN capability =>Page
- Adaption to dash panel insert not
performed correctly
- Data bus working only on one wire - Check data exchange => Page
Possible cause of trouble
- Open circuit in clock, enable or data
wire
- Problem with interface between navi‐
gation system and dash panel insert
- Fault caused by electromagnetic inter‐
ference in or outside vehicle
- Dash panel insert defective
Audi A8 1994 ➤
Remedy
- Use current flow diagram to per‐
form fault-finding
=> Current Flow Diagrams, Electri‐
cal Fault-finding and Fitting Loca‐
tions binder
- Select adaption channel 60 and
enter correct adaption value
=>Page 62
- Replace automatic parking sys‐
tem control unit
=> Electrical System; Repair
Group 94; Servicing automatic
parking system; Removing and in‐
stalling automatic parking system
control unit -J446
Remedy
- Use current flow diagram to per‐
form fault-finding
=> Current Flow Diagrams, Electri‐
cal Fault-finding and Fitting Loca‐
tions binder
- Select adaption channel 61 and
enter correct adaption value =>
27 Page 63
69
Use current flow diagram to per‐
form fault-finding
=> Current Flow Diagrams, Electri‐
cal Fault-finding and Fitting Loca‐
tions binder
Remedy
- Check data wires for damage
- Check causes of electromagnetic inter‐
ference
=> Radio, Telephone, Navigation; Repair
Group 91; Navigation System Navigation
System
- Replace dash panel insert
=> Electrical System; Repair Group 90;
Dash panel insert Dash panel insert
11
1.5 - Fault table