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Fuse & Electrical Short Test

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  1. Turn engine off. Remove and inspect Electronic Back-Light (EBL) fuse "A" (50-amp) from Power Distribution Center (PDC). See Figure . If fuse is blown, go to next step. If fuse is not blown, on vehicles with Automatic Temperature Control (ATC), see ATC TEST 1A: REAR WINDOW DEFOGGER MALFUNCTION  under DIAGNOSTIC TESTS, and on vehicles with Manual Temperature Control (MTC), see MTC TEST 1A: REAR WINDOW DEFOGGER MALFUNCTION  under DIAGNOSTIC TESTS.
  2. Locate rear window grid ground lead (Black wire). See Figure . Trace ground lead to ground connector (lug). Remove ground lug screw. Isolate ground lug. Using a DVOM, measure resistance between ground and ground lug. If resistance is less than 10 ohms, rear window defogger grid is shorting to ground. Replace rear window defogger grid. If resistance is more than 100 ohms, go to step  4 . If resistance is not as specified, go to next step.
  3. Disconnect rear window defogger grid voltage feed (Black/White wire) from wiring harness. If resistance is less than 10 ohms, rear window defogger grid is shorting to ground. Replace rear window defogger grid. If resistance is more than 100 ohms, go to next step.
  4. At this time, a problem exists in circuits to rear window defogger relay. Turn ignition off. Check related wiring and connectors for poor connections or damage to wiring harness. See WIRING DIAGRAMS  . Using a DVOM, check circuits to rear window defogger relay. Repair circuits as necessary. If circuits are okay, check if any Technical Service Bulletins (TSBs) apply to vehicle. If no TSBs apply, replace EBL fuse.
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