P1631
P1631Diagnosis information - CAN
Gateway control unit communication
NOTE: Internal function text completed.
Diagnostic conditions
The Gateway control unit first tests internal function sequences upon wake-up. If they are OK, all diagnosable outputs are then tested and any faults are stored.
Gateway control unit wake-up takes place after:
- event-controlled CAN message
- >Ignition on<
Possible fault causes
- No power supply for Gateway control unit
- Incorrect coding of Gateway control unit
- Short circuit or open circuit of CAN Drive
- Gateway control unit faulty (in most cases the cause is incorrect coding and not the Gateway control unit.)
Fault effects
- No communication can take place via CAN Drive
- No other control units are able to communicate with the Gateway control unit
Affected contacts on the Gateway control unit connector
- 1 Power supply - term. 30
- 6 CAN Drive low
- 11 Power supply - term. 31
- 13 Wake-up
- 14 Ground supply - term. 15
- 16 CAN Drive high