AWS

Fault Code 1312

PSM control unit

Diagnostic conditions
- Switch on ignition (switch it off first if necessary)
- Internal function test on AWS control unit

Possible cause of fault
- No signal/communication (no signal from PSM control unit on CAN comfort)
- No power supply to PSM control unit/PSM control unit not connected
- CAN comfort interrupted (high + low)
- CAN drive interrupted (high + low)

Diagnosis/Troubleshooting