Diagnostic Trouble Code (DTC) Information CEM-De52

Condition

Fig 1: Locating Accessory Electronic Module (AEM)

Courtesy of VOLVO CARS CORPORATION

The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers that communication with the accessory electronic module (AEM) 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 has been on for at least 10 seconds.

Substitute Value

None.

Possible Source

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

Accessories connected to the control module do not function.