Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information CEM-DD51

Condition




The Central Electronic Module (CEM) both transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network). If the control module registers serious interference, for example that the LIN communication to the cruise control switch is blocked, then the Diagnostic Trouble Code (DTC) is generated.
The diagnostic trouble code (DTC) can be detected when the ignition key is in position II for at least 10 seconds and the battery voltage exceeds 10.5 V.
Note! In the event of CEM-DDxx diagnostic trouble codes (DTCs), the central electronic module (CEM) must not be replaced as the diagnostic trouble code (DTC) indicates a short-circuit in one or more conductors in the LIN network. The central electronic module (CEM) is the only control module that monitors the voltage level in the LIN wiring. The central electronic module (CEM) is therefore the only control module that can store a diagnostic trouble code (DTC) for a short-circuit in one of the cables to ground or supply voltage. Do not replace the central electronic module (CEM) in the event of a LIN fault unless VADIS fault-tracing has indicated that the central electronic module (CEM) has an internal fault.

Substitute value
- None.

Possible source
- Short-circuit between the LIN wiring
- Open-circuit in the LIN wiring
- Internal fault in another control module in the same part of the LIN network.

Fault symptom[s]
- Cruise control does not function at all.