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.
NOTE:
In the event of CEM-1A5X diagnostic trouble codes (DTCs), the central electronic module (CEM) must not be replaced as the diagnostic trouble code (DTC) indicates a communication fault in the Control Area Network
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.
Fault symptom[s]
- Power seat does not operate at all
- Automatic seat/door mirror operation does not function.