Circuit Operation
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 body control module 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
horn(s) through the horn control circuit. The horn(s) sound as long as ground is applied to the horn relay control circuit.