Fault Code 34

Fault Code 34

NOTE:
- If this fault is actually present, then no communication is possible between the Porsche System Tester II No. 9588 and the air-conditioning system regulator.
- In this case carry out the test as described below.

Air-conditioning CAN Bus off

NOTE:
The CAN comfort bus is connected to the following control units:
- Instrument cluster
- Air-conditioning system regulator
- PCM2/CDR23 (if present)

NOTE: Communication between the Porsche System Tester II No. 9588 and the air-conditioning system regulator or PCM2/CDR23 (if present) occurs via the instrument cluster and the CAN comfort bus.

Diagnostic conditions
- Ignition on

Possible cause of fault
- Short circuit of CAN leads to B+/ground or between each other
- CAN leads interchanged
- A faulty control unit connected to CAN comfort bus

Affected pins
Plug B, pin 1 and pin 2

Diagnosis/troubleshooting

Work Instruction 1 - 4:

Work Instruction 5 - 7: