800A CDR23

800A CDR23

CAN Comfort Signal Fault, Air-Conditioning System

Diagnostic conditions
- Ignition on
- Start CDR23

Possible cause of fault
- Open circuit in CAN Bus Comfort (high)
- Open circuit in CAN Bus Comfort (low)

The CAN comfort is connected to the following control units:
- PCM2 as of model year 2003
- Instrument cluster
- Air-conditioning control unit
- Radio

NOTE: The plug connections of control modules connected to CAN comfort are disconnected during troubleshooting. This causes additional CAN-related fault codes, e.g. "9110 DME control module" to be stored in the fault memory of the instrument cluster. These fault codes should be initially ignored and should be deleted on completion of the troubleshooting.

Affected pin







CDR23 plug E, pins 1 and 2

Diagnosis/Troubleshooting

Work Instruction 1 - 4: