Diagnostic trouble code (DTC) information CEM-1A63

Condition 

Fig 1: Identifying Accessory Electronic Module

Courtesy of VOLVO CARS OF NORTH AMERICA.

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

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, see the wiring diagram. 

Fault symptom[s] 

• Accessories connected to the control module do not function.