Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information CEM-U012200

Condition
The control modules communicate with each other for exchange of information in a network via a standardized serial communication procedure - CAN (Controller Area Network).
The diagnostic trouble code (DTC) is stored if the control module detects that:
- No communication with the Suspension module (SUM).
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Ignition switch position II.

Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met. The diagnostic trouble code (DTC) indicates a fault in the communication across the CAN network and does not isolate an individual node. Do not replace the central electronic module (CEM) unless fault-tracing indicates a damaged control module.





Substitute value
- None.

Possible source
- Voltage supply to the Suspension module (SUM) missing.
- Open circuit in the ground lead for the suspension module (SUM).
- Contact resistance in the terminals.
- Open-circuit or short-circuit in the wiring for the control area network (CAN).
- The Suspension module (SUM) is not intended for this vehicle, for example, it is a used control module with other software/hardware.

Fault symptom[s]
- General warning lamp lit
- Four-C function not working