Horn: Testing and Inspection

For complete circuit diagrams, 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 the wire harness connector(s) from the horn connector receptacle(s). Measure the resistance between the ground circuit cavity of the horn(s) wire harness connector(s) and a good ground. There should be no measurable resistance.
If OK, go to Step 2.
If not OK, repair the open ground circuit to ground as required.

2. Check for battery voltage at the horn relay output circuit cavity of the horn(s) wire harness connector(s). There should be zero volts.
If OK, go to Step 3.
If not OK, repair the shorted horn relay output circuit or replace the faulty horn relay as required.

3. Depress the horn switch. There should now be battery voltage at the horn relay output circuit cavity of the horn(s) wire harness connector(s).
If OK, replace the faulty horn(s).
If not OK, repair the open horn relay output circuit to the horn relay as required.