800B CDR23

800B CDR23

CAN Comfort Timeout, Instrument Cluster

Diagnostic conditions
- Ignition on
- Start CDR23

Possible cause of fault
- Short circuit between the two CAN leads (CAN-high and CAN-low)
- Short circuit between CAN-high (drive) and ground
- Short circuit between CAN-low (drive) and voltage
- A faulty control unit connected to CAN drive bus

NOTE:
The CAN Comfort is connected to the following control units:
- CDR23 as of model year 2003
- Instrument cluster
- Air-conditioning control unit
- Radio

NOTE: The plug connections of control units connected to the CAN drive bus are disconnected for trouble shooting. This has the effect that additional CAN relevant fault codes such as "9110DME control unit" are 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 - 6: