Diagnostic trouble code (DTC) information CEM-1A5F

Condition 

Fig 1: Brake Control 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 brake control module (BCM) is not operating.

Substitute Value 

No ABS function.

Possible Source 

• No power supply to the brake control module (BCM)
• Open-circuit in the ground lead to the brake control module (BCM)
• Contact resistance in the terminals
• Open-circuit in the wiring for the CAN high speed network to the brake control module (BCM)
• The brake control module (BCM) 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 appropriate wiring diagram. 

Fault symptom[s] 

• The ABS warning lamp is lit
• No ABS function
• Message in the display.