Diagnostic trouble code (DTC) information CEM-1A5E

Condition 

Fig 1: Identifying Steering Wheel Control Module

Courtesy of VOLVO CARS OF NORTH AMERICA.

The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers that communication with the steering wheel angle sensor module (SAS) is not operating.

The steering wheel angle sensor module (SAS) is located inside, and is supplied with power by, the steering wheel module (SWM). Only the steering wheel angle sensor module (SAS) communicates on the controller area network (CAN).

The diagnostic trouble code (DTC) can be diagnosed when the ignition has been on for more than 10 seconds.

Substitute Value 

• None.

Possible Source 

• No power supply to the steering wheel module (SWM)
• Open-circuit in the ground lead for the steering wheel module (SWM)
• Contact resistance in the terminals
• Open-circuit in the wiring for the CAN high speed network to the steering wheel angle sensor module (SAS)
• The steering wheel module (SWM) is not intended for this vehicle (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 high speed network, this indicates a common fault in the controller area network (CAN). see appropriate wiring diagram. 

Fault symptom[s] 

• No stability function.
• Message in the display.