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Home >> Volvo >> 2012 >> XC90 Base, AWD >> Repair and Diagnosis (Single Page) >> Electrical >> Body Electrical >> Rear Electronic Module (Rem) And Upper Electronic Module (UEM) Diagnostic Trouble Codes >> Rem-8F63: Relay, Rear Demist. Signal Missing. Permanent Fault (2003-2004) >> Signal Missing. Permanent Fault >> Checking The Wiring And Component

Checking The Wiring And Component

Check that the "Rear windshield defroster" relay 2/82 is intact. Check that the relay is correctly installed.

Check that the main fuse 11E/5 and 11D/5 is intact.

Check the cable between main fuse 11E/5 and "Rear windshield defroster" relay 2/82 terminal #5. Check the cable between main fuse 11D/5 and "Rear windshield defroster" relay 2/82 terminal #1. Check the cable between rear electronic module terminal #D1 (terminal #B01) and "Rear windshield defroster" relay 2/82 terminal #2. Check these cables for an open-circuit according to OPEN-CIRCUIT, PERMANENT FAULTS .

Check the relay terminal for an open-circuit according to OPEN-CIRCUIT, PERMANENT FAULTS .

Remedy as necessary.

Try a new relay if no faults are found.

Other information: 

Fig 1: Identifying Ohms Display
GLL101042Courtesy of VOLVO CARS CORPORATION
Fig 2: Identifying Relays And Terminals
GLL104089Courtesy of VOLVO CARS CORPORATION