Diagnostic Trouble Code (DTC) Information CEM-1A56

Condition 

Fig 1: Driver Information Module

Courtesy of VOLVO CARS CORPORATION

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

Substitute Value 

None.

Possible Source 

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

• No gauges working
• The instrument lighting does not operate.