Diagnosis And Testing - Horn
WARNING: This page is about a different variant/trim than selected.
WARNING:
On vehicles equipped with the high voltage system, disconnecting the 12-volt battery negative cable alone will not power down the 12-volt system. You must perform the 12-volt Power Down procedure before proceeding. Failure to follow these instructions may result in possible serious or fatal injury.
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.
- Disconnect the wire harness connector from the horn. Check for continuity between the horn ground circuit cavity of the harness connector and a good ground. There should be continuity. If OK, go to Step 2. If not OK, repair the open ground circuit to ground as required.
- Check for battery voltage at the horn input circuit cavity of the harness connector. There should be zero volts. If OK, go to Step 3. If not OK, repair the shorted horn output circuit between the horn and the horn relay in the Power Distribution Center (PDC) as required.
- Depress the horn switch. There should now be battery voltage at the horn input circuit cavity of the harness connector for the horn. If OK, replace the ineffective horn. If not OK, perform further diagnosis of the horn switch, the clockspring and the horn switch input to the horn relay in the PDC as required.