Grand Cherokee 2WD V8-4.7L VIN J (2004)
Heated Glass Element Switch: Testing and Inspection
For complete circuit diagrams, refer to the Appropriate Wiring Information.
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING
WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. DISCONNECT AND ISOLATE
THE BATTERY NEGATIVE (GROUND) CABLE, THEN WAIT TWO MINUTES FOR THE AIRBAG SYSTEM CAPACITOR TO
DISCHARGE BEFORE PERFORMING FURTHER DIAGNOSIS OR SERVICE. THIS IS THE ONLY SURE WAY TO DISABLE THE
AIRBAG SYSTEM. FAILURE TO TAKE THE PROPER PRECAUTIONS COULD RESULT IN AN ACCIDENTAL AIRBAG
DEPLOYMENT AND POSSIBLE PERSONAL INJURY.
1. Disconnect and isolate the battery negative cable. Remove the a/c heater control 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 a/c heater 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 a/c heater 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 a/c heater control 11-way or 16-way connector receptacle. Connect one jumper from the ground circuit terminal
in the 11-way or 16-way a/c heater 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 a/c heater control.
4. Check for continuity between the ground circuit and rear window defogger switch sense circuit terminals of the 11-way or 16-way a/c heater
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 a/c heater control.
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 a/c heater
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 a/c heater control and the 22-way instrument panel wire harness connector for the BCM. There should be continuity If OK, refer
to (Refer to ELECTRICAL/HEATED GLASS/REAR WINDOW DEFOGGER RELAY - DIAGNOSIS AND TESTING).
