Grand Cherokee 2WD L6-4.0L VIN S (1997)
Heated Glass Element Switch: Testing and Inspection
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFORE
ATTEMPTING 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 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. Using two jumper wires, connect the ground circuit terminal in the 10-way connector receptacle on the back of the switch pod housing to a good
ground, connect the fused rear window defogger relay output circuit terminal of the 10-way connector receptacle to a 12-Volt battery feed. The
defogger switch LED 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 connector receptacle on
the back of the 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 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 switch pod 10-way wire harness connector and the
BCM white 24-way harness connector. There should be continuity If OK, see the Defogger Relay diagnosis. If not OK, repair the open circuit as
required.
