P1631

P1631

Diagnosis information - CAN

Gateway (CAN drive) control unit, communication

Diagnostic conditions
The gateway control unit initially tests internal function sequences after wake-up. If they are OK, all diagnosable outputs are then tested and any faults are stored.
Gateway control unit wake-up through:

- Event-induced CAN message
- Wake-up signal via wake-up line
- Ignition on

Possible fault causes
- No power supply for gateway control unit
- Gateway control unit is incorrectly coded
- Short circuit or open circuit in the CAN drive
- Gateway control unit faulty (in most cases the cause is not the gateway control unit but incorrect coding.)

Fault effects
- Communication via the CAN drive is no longer possible
- No other control units are able to communicate with the gateway control unit.

Affected contacts on the gateway control unit
Connector [A]:
- 1 power supply - terminal 30
- 6 CAN drive low
- 11 ground supply - terminal 31
- 13 Wake-up
- 14 power supply - terminal 15
- 16 CAN drive high