Circuit Operation

The horn system originates at the HORN fuse. The horn circuit extends from the fuse block to the horn relay, where the circuit splits into two branches. One branch goes through the relay coil to the horn switch in the steering column, and the Other branch goes through the relay contacts to the horn.

When the horn switch is closed, the horn relay coil grounds. The current flows through the coil, the relay contacts close, and the horns sound.

The horn relay is located in the convenience center, under the instrument panel to the left of the steering column.

Battery positive voltage is applied at all times to the horn relay coil and the horn relay switch. Pressing the horn switch applies ground to the horn relay control circuit. The BCM may also apply ground to the horn relay control circuit as described above. When the horn relay control circuit is grounded, the horn relay is energized and battery positive voltage is applied to the horns through the horn control circuit. The horns sound as long as ground is applied to the horn relay control circuit.