PSM Control Module, Communication

U0129

Diagnosis information - CAN

PSM control module, communication

NOTE: Internal function test completed.

Diagnostic conditions
The PSM 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. PSM control module wake-up through:
- event-induced CAN message
- "Ignition on"

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

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

Affected contacts on the PSM control module connector
Connector A:
- 4 ground supply - terminal 31
- 14 CAN drive low
- 28 power supply - terminal 15
- 35 CAN drive high