1A5X - 10

Condition







Diagnostic trouble codes (DTCs) are stored if the central electronic module (CEM) registers that communication with the rear electronic module (REM) is not operating.

NOTE: In the event of CEM-1A5X diagnostic trouble codes (DTCs), the central electronic module (CEM) must not be replaced as the diagnostic trouble code (DTC) indicates a communication fault in the Control area network.

Substitute value

- None.

Possible source

- No power supply to rear electronic module (REM).
- Open-circuit in the ground lead to the rear electronic module (REM).
- Contact resistance in the terminals.
- Open-circuit in the wiring for the CAN low speed network to the rear electronic module (REM).
- The rear electronic module (REM) is not intended for this car for example a used control module with different software/hardware).

Hint: If several diagnostic trouble codes (DTCs) are stored in the central electronic module (CEM) for communication faults with other control modules in the low speed network, this indicates a common fault in the Control area network, see the wiring diagram.

Fault symptom[s]

- The fuel indicator indicates the minimum value even though there is fuel in the tank.
- Rear demist does not operate.
- Retractable headrest not operating.
- No locking/unlocking of rear doors.
- No unlocking of trunk lid.
- The power window mechanism in the rear door does not operate.