Diagnostic Trouble Code (DTC) Information CEM-1A07

Condition 

Fig 1: Identifying Central Electronic Module (CEM)

Courtesy of VOLVO CARS CORPORATION

The central electronic module (CEM) monitors the cable for 15-supply from the ignition switch.

The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers a short-circuit to supply voltage in the cable for the 15-supply.

The diagnostic trouble code (DTC) can be diagnosed at ignition switch position 0.

Substitute Value 

• None.

Possible Source 

• Short-circuit to supply voltage in the 15-supply cable from the ignition switch
• Damaged ignition switch.

Fault symptom[s] 

• The starter motor does not turn.
• The battery discharges.