Horn Test

1. Measure the resistance between the horn mounting bracket and a good ground. There should be no measurable resistance. If OK, go to Step 2. If not OK, clean and tighten the horn mounting hardware as required.
2. Disconnect the headlamp and dash wire harness connector for the horn from the horn connector receptacle. Check for battery voltage at the horn relay output circuit cavity of the headlamp and dash wire harness connector for the horn. There should be zero volts. If OK, go to Step 3. If not OK, refer to horn relay and horn relay circuit for the proper diagnosis and testing procedures.
3. Depress the horn switch. There should now be battery voltage at the horn relay output circuit cavity of the headlamp and dash wire harness connector for the horn. If OK, but the horn does not sound, replace the faulty horn. If not OK, refer to horn relay and horn relay circuit for the proper diagnosis and testing procedures.