RAM 3500 Van V8-5.9L VIN Z LDC (1998)
Horn Switch: Testing and Inspection
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO AIRBAGS 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. Remove the steering column opening cover and knee blocker from the instrument panel.
2. Check for continuity between the metal steering column jacket and a good ground. There should be continuity. If OK, go to Step 4. If not OK,
refer to Steering and Suspension/Steering Column.
3. Remove the driver side airbag module from the steering wheel. Refer to Airbag Module in Air Bags and Seat Belts/Air Bags for the procedures.
Unplug the horn switch wire harness connector from the air-bag module.
4. Unplug the horn relay from the junction block. Check for continuity between the steering column half of the horn switch feed wire harness
connector and a good ground. There should be no continuity If OK, go to Step 6. If not OK, see Horn Contact in the Diagnosis and Testing.
5. Check for continuity between the steering column half of the horn switch feed wire harness connector and the horn relay control circuit cavity for
the horn relay in the PDC. There should be continuity If OK, go to Step 7. If not OK, see Horn Tower in the Diagnosis and Testing.
6. Check for continuity between the horn switch feed wire and the horn switch ground wire on the airbag module. There should be no continuity. If
OK, go to Step 8. If not OK, replace the faulty horn switch.
7. Depress the center of the airbag module trim cover and check for continuity between the horn switch feed wire and the horn switch ground wire on
the airbag module. There should now be continuity If not OK, replace the faulty horn switch.
