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Heated Glass Element Switch: Testing and Inspection

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

1. Disconnect and isolate the battery negative cable. Remove the heater and air conditioner control unit from the instrument panel and disconnect the 11-way (manual temperature control) or 16-way (automatic zone control) instrument panel wire harness connector from the heater and air conditioner control receptacle.
2. Check for continuity between the ground circuit cavity of the 11-way or 16-way instrument panel wire harness connector for the heater and air conditioner control and a good ground. There should be continuity. If OK, go to Step 3. If not OK, repair the open ground circuit to ground as required.
3. Connect two jumper wires to the heater and air conditioner control 11-way or 16-way connector receptacle. Connect one jumper from the ground circuit terminal in the 11-way or 16-way heater and air conditioner control connector receptacle to a good ground. Connect the other jumper from the fused rear window defogger relay output circuit terminal of the 11-way or 16-way connector receptacle to a 12-volt battery feed. The rear window defogger switch LED indicator should light. If OK, go to Step 4. If not OK, replace the faulty heater and air conditioner control unit.
4. Check for continuity between the ground circuit and rear window defogger switch sense circuit terminals of the 11-way or 16-way heater and air conditioner control connector receptacle. There should be momentary continuity as the rear window defogger switch push button is depressed, and then no continuity. If OK, go to Step 5. If not OK, replace the faulty heater and air conditioner control unit.
5. Disconnect the 22-way instrument panel wire harness connector from the Body Control Module (BCM) connector receptacle. Check for continuity between the rear window defogger switch sense circuit cavity of the 11-way or 16-way instrument panel wire harness connector for the heater and air conditioner control and a good ground. There should be no continuity. If OK, go to Step 6. If not OK, repair the shorted rear window defogger switch sense circuit as required.
6. Check for continuity between the rear window defogger switch sense circuit cavities of the 11-way or 16-way instrument panel wire harness connector for the heater and air conditioner control and the 22-way instrument panel wire harness connector for the BCM. There should be continuity. If OK, refer to Rear Window Defogger Relay in the Diagnosis and Testing. If not OK, repair the open rear window defogger switch sense circuit as required.
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