P1604

P1604

CAN Airbag - Implausible Signal From Airbag

Diagnosis conditions
- Battery positive voltage between 10 V and 16 V
- Ignition switched on
- Internal function test for DME control module

Possible fault cause
- Faulty communication with the airbag control module

Affected pin
DME control module connector A, pin 60, 'CAN - HIGH'
DME control module connector A, pin 58, 'CAN - LOW'

Diagnosis/troubleshooting
- If the received signal does not appear via the CAN data bus for multiple control modules, the CAN data bus must be checked for an open circuit and/or a short circuit. In this regard, see 'Checking instructions/CAN data bus'.
- The CAN message, 'CAN Airbag - Implausible Signal', is sent by the airbag control module if important signals exceed a predetermined value.
- If connector A is disconnected from the DME control module and the ignition is or was switched on, the 'DME Control Module TIMEOUT' fault is recorded in many control modules.
- If control module connector A was disconnected from the DME in the course of troubleshooting or if the voltage supply was interrupted elsewhere (battery, fuse), the throttle adjusting unit must be adapted.