Diagnostic Trouble Code (DTC) Information CEM-De1A
Condition
The diagnostic trouble code (DTC) is generated if the central electronic module (CEM) registers that communication with the Differential Electronic Module (DEM) is not operating.
NOTE:
In the event of CEM-DEXX diagnostic trouble codes (DTCs) being stored the central electronic module (CEM) must not be replaced; the diagnostic trouble code (DTC) indicates a communication fault in the Control area network
The diagnostic trouble code (DTC) can be diagnosed when the ignition is switched on.
Substitute Value
- None.
Possible Source
- Voltage supply to the Differential electronic module (DEM) is missing.
- Open circuit in ground lead for the Differential electronic module (DEM).
- Contact resistance in the terminals.
- Open circuit in the wiring for the CAN low-speed network to the Differential Electronic Module (DEM)
- Differential Electronic Module (DEM) is not intended for this car, e. g., used control module with other hardware/software.
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.
Fault symptom[s]
- 4-wheel/all wheel drive/Does not work
- Text window and warning symbol/Text message