U0155

U0155

Diagnosis information - CAN

Instrument cluster, communication

NOTE: Internal function test completed.

Diagnostic conditions
The instrument cluster initially tests internal function sequences after wake-up. If they are OK, all diagnosable outputs are then tested and any faults are stored.

Instrument cluster wake-up through:
- event-induced CAN message
- wake-up signal via wake-up line
- "Ignition on"

Possible fault causes
- No power supply for instrument cluster
- Instrument cluster incorrectly coded
- Short circuit or open circuit in the CAN display
- Instrument cluster faulty (in most cases the cause is not the instrument cluster but incorrect coding.)

Fault effects
- Communication via the CAN display is no longer possible.
- No other control modules are able to communicate with the instrument cluster.

Affected contacts on the instrument cluster connector
Connector A:
- 1 ground supply - terminal 31
- 2 power supply - terminal 30
- 17 ground supply - terminal 31
- 18 power supply - terminal 30
- 30 wake-up
- 31 CAN display high
- 32 CAN display low