Possible cause of fault
- Short circuit between the two CAN leads (CAN-high and CAN-low)
- Short circuit between CAN comfort (high) (drive) and ground
- Short circuit between CAN comfort (low) (drive) and voltage
- A faulty control unit connected to CAN drive bus
NOTE:
- CAN bus 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 causes additional CAN-related fault codes, for example, 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.