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Home >> Volvo >> 2012 >> XC90 R-Design, FWD >> Repair and Diagnosis (Single Page) >> Electrical >> Motors, Switches, Relays >> Accessory Electronic Module (AEM) And Central Electronic Module (CEM) - Diagnostic Trouble Codes - 2 Of 2 >> CEM-8D04: Internal Fault In Control Module (2005-2014) >> Fault-Tracing >> Replacing A Component
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Replacing A Component

The component has registered an internal fault.

Troubleshoot according to:

1. Check the brake light switch connector for contact resistance and oxidation.

2. Check that the brake light switch is supplied with voltage.

3. Check leads between Central electronic module (CEM) and brake light switch.

If no defect is found and the brake light is on constantly, change Central electronic module (CEM).

NOTE:

Central electronic module (CEM) shall not be replaced if the brake lights work correctly. Then the diagnostic trouble code shall be erased instead.

Remedy as necessary.

Other information