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Home >> Volvo >> 2013 >> 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. Intermittent Fault (2003-2004) >> Signal Missing. Intermittent Fault >> Checking The Wiring And Component

Checking The Wiring And Component

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

Check the rear electronic module connector and relay terminal 2/82. Check for contact resistance and oxidation according to CONTACT RESISTANCE AND OXIDATION . Check for loose connections according to LOOSE CONNECTIONS (TERMINALS) .

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 (#B01) and "Rear windshield defroster" relay 2/82 terminal #2. Check these cables for an intermittent short-circuit to ground according to SHORT-CIRCUIT TO GROUND, INTERMITTENT FAULTS . Check for an intermittent open-circuit according to OPEN-CIRCUIT, INTERMITTENT FAULTS .

Other information: 

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