Diagnostic trouble code (DTC) information CEM-1A52

Condition 

Diagnostic trouble codes (DTCs) are stored if the central electronic module (CEM) registers that communication with the driver's door module (DDM) is not operating.

Substitute Value 

None.

Possible Source 

• No power supply to the driver's door module (DDM)
• Open-circuit in the ground lead to the driver's door module (DDM)
• Contact resistance in the terminals
• Open-circuit in the wiring for the CAN low speed network to the driver's door module (DDM)
• The driver's door module (DDM) is not intended for this car (for example a used control module with different software/hardware).

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, see the wiring diagram. 

Fault symptom[s] 

• Does not lock / unlock a door
• The driver's door switch panel does not work.