Diagnostic trouble code (DTC) information CEM-1A59

Condition 

Fig 1: Audio 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 audio module (AUM) is not operating.

Substitute Value 

None.

Possible Source 

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

• The rheostat function on the audio system is not working
• Cannot be controlled with the remote control
• Buttons on the steering wheel are not working.