Diagnostic trouble code (DTC) information CEM-1A54

Condition 

Diagnostic trouble codes (DTCs) are stored if the central electronic module (CEM) registers that communication with the power seat module (PSM) is not operating.

Substitute Value 

None.

Possible Source 

• No power supply to the power seat module (PSM)
• Open-circuit in the ground lead to the power seat module (PSM)
• Contact resistance in the terminals
• Open-circuit in the wiring for the CAN low speed network to the power seat module (PSM)
• The power seat module (PSM) 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] 

• Power seat does not operate at all
• Automatic seat/door mirror operation does not function.