Grand Cherokee 4WD V8-4.7L VIN N (2000)
Seat Belt Buckle 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. Disconnect the left body wire harness (manual seat), or the driver side power seat wire harness
(power seat) from the driver seat belt switch wire harness connector located under the driver side front seat cushion. Check for continuity between
the seat belt switch sense circuit and the ground circuit cavities in the seat belt switch wire harness connector. There should be continuity with the
driver side seat belt tip-half and buckle-half unfastened, and no continuity with tip-half and buckle-half fastened. If OK, go to Step 2. If not OK,
replace the faulty driver side seat belt buckle-half unit.
2. Check for continuity between the ground circuit cavity in the left body wire harness connector (manual seat), or the driver side power seat wire
harness connector (power seat) for the driver seat belt switch 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. Disconnect the 52-way left body wire harness connector from the junction block. Check for continuity between the seat belt switch sense circuit
cavity in the left body wire harness connector (manual seat), or the driver side power seat wire harness connector (power seat) for the driver seat
belt switch and a good ground. There should be no continuity. If OK, go to Step 4. If not OK, repair the shorted seat belt switch sense circuit as
required.
4. Check for continuity between the seat belt switch sense circuit cavities in the left body wire harness connector (manual seat), or the driver side
power seat wire harness connector (power seat) for the driver seat belt switch and the 52-way left body wire harness connector for the junction
block. There should be continuity. If OK, use a DRB scan tool and the proper Diagnostic Procedures to test the BCM. If not OK, repair the open
seat belt switch sense circuit as required.
