RAM 2500 Truck 2WD L6-5.9L DSL Turbo VIN 7 (2001)
Seat Belt Buckle Switch: Testing and Inspection
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 ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
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 located near the floor panel 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 pigtail wire 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 body wire harness connector for the 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 (G301 - standard cab, or G300 - club/quad cab) as required.
3. Remove the instrument cluster from the instrument panel. Check for continuity between the seat belt switch sense circuit cavity in the instrument
panel wire harness connector (Connector C2) for the instrument cluster 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 in the body wire harness connector for the seat belt switch and the
instrument panel wire harness connector (Connector C2) for the instrument cluster. There should be continuity. If OK, proceed to the diagnosis for
the instrument cluster. (Refer to INSTRUMENT CLUSTER - DIAGNOSIS AND TESTING). If not OK, repair the open seat belt switch sense
circuit between the seat belt switch and the instrument cluster as required.
