Diagnostic trouble code (DTC) information CEM-1A03

Condition 

Fig 1: Identifying Central Electronic Module (CEM)

Courtesy of VOLVO CARS OF NORTH AMERICA.

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

The diagnostic trouble code (DTC) is stored if the central electronic module (CEM) registers an open-circuit or a short-circuit to ground in the S-supply.

The diagnostic trouble code (DTC) can be diagnosed in ignition positions I and II.

Substitute Value 

• None.

Possible Source 

• Contact resistance in the terminals
• Open-circuit or short-circuit to ground in the S-supply
• No communication with the key
• Damaged ignition switch.

Fault symptom[s] 

• The starter motor does not turn.