800B CDR23

800B CDR23

CAN 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 Bus 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 troubleshooting. This causes additional CAN-relevant 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 - 3:

Work Instruction 4 - 6: