Heated Glass Element Switch: Testing and Inspection

WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO AIRBAGS SYSTEMS BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN ACCIDENTAL AIR-BAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.

1. Disconnect and isolate the battery negative cable. Remove the inboard instrument panel switch pod and unplug the switch pod 10-way wire harness connector.
2. Check for continuity between the ground circuit cavity of the switch pod 10-way wire harness connector and a good ground. There should be continuity If OK, go to Step 3. If not OK, repair the open circuit as required.
3. Connect two jumper wires to the inboard switch pod. Connect one jumper from the ground circuit terminal in the 10-way wire harness connector receptacle on the back of the inboard switch pod housing to a good ground. Connect the other jumper from the fused rear window defogger relay output circuit terminal of the 10-way wire harness connector receptacle to a 12-volt battery feed. The defogger switch LED indicator should light. If OK, go to Step 4. If not OK, replace the faulty inboard switch pod.
4. Check for continuity between the ground circuit and rear window defogger switch sense circuit terminals of the 10-way wire harness connector receptacle on the back of the inboard switch pod housing. There should be momentary continuity as the defogger switch button is depressed, and then no continuity. If OK, go to Step 5. If not OK, replace the faulty inboard switch pod.
5. Unplug the white 24-way wire harness connector from the Body Control Module (BCM). Check for continuity between the rear window defogger switch sense circuit cavity of the inboard switch pod 10-way wire harness connector and a good ground. There should be no continuity. If OK, go to Step 6. If not OK, repair the short circuit as required.
6. Check for continuity between the rear window defogger switch sense circuit cavities of the inboard switch pod 10-way wire harness connector and the BCM white 24-way wire harness connector. There should be continuity. If OK, see the Defogger Relay diagnosis. If not OK, repair the open circuit as required.