Diagnostic trouble code (DTC) information CEM-1A51

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2009 Volvo S60, 2008 Volvo S60, 2007 Volvo S60, 2006 Volvo S60, and 2005 Volvo S60. However, it is still accessible from the selected car via links, so may be relevant.

Condition

Fig 1: Identifying SRS 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 supplementary restraint system (SRS) control module is not operating.

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

NOTE:

In the event of CEM-1A5X diagnostic trouble codes (DTCs), the central electronic module (CEM) must not be replaced as the diagnostic trouble code (DTC) indicates a communication fault in the controller area network (CAN)

Substitute Value

None.

Possible Source

No power supply to SRS control module
Open-circuit in the ground lead for the supplemental restraint system module (SRS)
Contact resistance in the terminals
Open-circuit in the wiring for the CAN low speed network to the SRS control module
The supplemental restraint system module (SRS) 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 low speed network, this indicates a common fault in the controller area network (CAN). See the relevant wiring diagram.

Fault symptom[s]

The SRS indicator lamp is lit.