Instrument Cluster

Fault code 0478

Rear air-conditioning control module

Diagnostic conditions
- Ignition on
- Internal gateway function test

Possible causes of fault
-

Affected pins
Instrument cluster, plug B:
- Pin 19 'CAN drive (high)'
- Pin 20 'CAN drive (low)'

Diagnosis/troubleshooting

NOTE: If there is no incoming signal via the CAN drive using several control modules, the CAN drive must be checked for open or short circuits. Refer to 'Checking instructions/CAN data bus (Rep. Gr. 9700)'.