Seat Belt Buckle Switch: Testing and Inspection

WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE AIRBAG SYSTEM BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, SEAT BELT TENSIONER, 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 ACCIDENTAL AIRBAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY.


SEAT BELT SWITCH
Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views for the various wire harness connectors, splices and grounds.


1. Disconnect and isolate the battery negative cable. Disconnect the body wire harness connector for the seat belt switch from the seat belt switch pigtail wire connector near the driver side front seat belt retractor on the left B-pillar. Check for continuity between the ground circuit cavity in the body wire harness connector for the seat belt switch and a good ground. There should be continuity.
If OK, go to Step 2.
If not OK, repair the open ground circuit to ground (G300) as required.

2. Check for continuity between the two cavities in the seat belt switch pigtail wire connector. There should be no continuity with the seat belt webbing retracted, and continuity with the seat belt webbing pulled from the retractor far enough to engage the seat belt buckle.
If OK, go to Step 3.
If not OK, replace the faulty driver side front seat belt and retractor unit.

3. Remove the instrument cluster from the instrument panel. Check for continuity between the seat belt switch sense circuit cavity of the body wire harness connector for the 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 between the seat belt switch and the instrument cluster as required.

4. Check for continuity between the seat belt switch sense circuit cavities of the instrument panel wire harness connector (Connector C2) for the instrument cluster and the body wire harness connector for the seat belt switch. There should be continuity.
If OK, proceed to the diagnosis for the instrument cluster.
If not OK, repair the open seat belt switch sense circuit between the seat belt switch and the instrument cluster as required.