Horn: Testing and Inspection

For additional testing and inspection information please refer to Powertrain Management/Computers and Control Systems/ Body Control Module

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