Horns Inoperative

Horns Inoperative

Test Description

Step 1 - Step 12:

Step 13 - Step 24:

The numbers below refer to the step numbers on the diagnostic table.
4. This step verifies that the body control module (BCM) is providing ground to the horn relay.
5. This step tests for voltage at the battery positive voltage terminal of the horn relay coil.
7. This step tests for voltage at the battery positive voltage terminal of the horn relay switch. The HORN fuse supplies power to the battery positive voltage terminal of the horn relay switch.
15. The horns need maximum current flow to operate properly. A high resistance, greater than 0.5 ohms, in the horn control circuit or the horn ground circuit could cause operating problems with the horns. Inspect the circuits for faults that would restrict current flow.
17. The horn control circuit includes the horn slip ring and the horn switch. The horn slip ring and the horn switch must be tested for a high resistance, an open, or a short to voltage when testing the relay control circuit.