P1635

P1635

Rear control module, communication

NOTE: Internal function test completed.

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

Rear control module wake-up through:
- event-induced CAN message
- "Ignition on"

Possible fault causes
- No power supply for rear control module
- Rear control module is incorrectly coded
- Short circuit or open circuit in the CAN convenience
- Rear control module faulty (in most cases the cause is not the rear control module but incorrect coding.)

Fault effects
- Communication via the CAN convenience is no longer possible.
- No other control modules are able to communicate with the rear control module.

Affected contacts on the rear control module connector

Connector A:
- 8 power supply - terminal 15
- 23 power supply - terminal 30

Connector B:
- 2 CAN convenience high
- 8 CAN convenience low
- 11 ground supply - terminal 31