1A5X - 9

Condition







Diagnostic trouble codes (DTCs) are stored if the central electronic module (CEM) registers that communication with the audio module (AUM) 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 the audio module (AUM).
- Open-circuit in the ground lead to the audio module (AUM).
- Contact resistance in the terminals.
- Open-circuit in the wiring for the CAN low speed network to the audio module (AUM).
- The audio module (AUM) 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 rheostat function on the audio system is not working.
- Cannot be controlled with the remote control.
- Buttons on the steering wheel are not working.