Grand Cherokee 2WD L6-4.0L VIN S (1997)
Horn Switch: Testing and Inspection
WARNING: ON VEHICLES EQUIPPED WITH AIRBAGS, REFER TO AIR BAGS AND SEAT BELTS/AIR BAGS BEFORE
ATTEMPTING 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 lower steering column cover/knee blocker. Check for continuity between the metal
steering column jacket and a good ground. There should be continuity If OK, go to Step 2. If not OK, refer to Steering and check for proper
installation of the steering column ground clip.
2. Remove the driver side airbag module as described in Passive Restraint Systems. Unplug the two horn switch wire harness connectors from the
airbag module. Unplug the Body Control Module (BCM) wire harness connector B (white). Unplug the horn relay from the Power Distribution
Center (PDC). Check for continuity between the steering column half of the horn switch wire harness connector and a good ground. There should
be no continuity. If OK, go to Step 3. If not OK, repair the short circuit as required.
3. Check for continuity between the steering column half of the horn switch 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 4. If not OK, repair the open circuit as required.
4. Check for continuity between the two horn switch wire harness connectors on the airbag module. There should be no continuity If OK, go to Step
5. If not OK, replace the faulty horn switch.
5. Depress the center of the airbag module cover and check for continuity between the two horn switch wire harness connectors on the airbag module.
There should now be continuity If not OK, replace the faulty horn switch.
