Fault-Tracing Information

Fault-tracing

Checking software
Diagnostic trouble code CEM-U300004 indicates a fault in the central electronic module (CEM) internal processes.

Action
- Delete diagnostic trouble codes in the central electronic module (CEM).
- Download new software to the Central electronic module (CEM).

Choose Continue to proceed to verification.

Continue - Verification

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Verification




Verification

Hint: After carrying out the repair, check that the fault has been remedied.








- Ignition off
- Reinstall the connectors, components etc.
- Switch on the ignition for at least 10 seconds.
Try communicating with the control module by selecting one of the functions for vehicle communication.

Is communication established?

Yes - VERIFIED

No - VERIFICATION FAILED

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VERIFIED - FAULT FOUND

VERIFICATION FAILED - Checking software

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