Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information CEM-DD41

Condition




The central electronic module (CEM) transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network). The diagnostic trouble code (DTC) is stored if the control module registers serious interference such as blocked LIN communication with the steering wheel module (SWM).
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 VIDA fault-tracing has indicated that the central electronic module (CEM) has an internal fault.

Substitute value
- None.

Possible source
- Short-circuit to ground in the LIN cable
- Short-circuit to supply voltage in the LIN cable.

Fault symptom[s]
- The windshield wipers only operate at lowest speed
- Front windshield washing does not work
- Rear windshield washing does not work
- The turn signal lamp switch does not work
- Cruise control does not work at all
- The turn signal lamps are not operating
- The radio buttons on the steering wheel do not function
- The phone buttons on the steering wheel do not work.