1A5X - 15

Condition







Diagnostic trouble codes (DTCs) are stored if the central electronic module (CEM) registers that communication with the brake control module (BCM) 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

- No ABS function.

Possible source

- No power supply to the brake control module (BCM).
- Open-circuit in the ground lead to the brake control module (BCM).
- Contact resistance in the terminals.
- Open-circuit in the wiring for the CAN high speed network to the brake control module (BCM).
- The brake control module (BCM) 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 ABS warning lamp is lit.
- No ABS function.
- Message the display.