System Description
The horn system consists of the following components:
| • | Body control module (BCM) |
System Operation
The vehicle horn system is activated under the following conditions:
| • | The horn switch is depressed. |
| • | The body control module (BCM) commands the horns on. The BCM commands the horns on under any of the following conditions: |
| - | When the keyless entry system is used to lock the vehicle, a horn chirp may sound to notify the driver that the vehicle has been locked. The notification feature may be enabled or disabled through personalization. For further information refer to
Keyless Entry System Description and Operation. |
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 through the switch contacts and the horn relay control circuit to the coil side of the relay, energizing the relay.
Battery voltage is then applied through the switch side of the relay, the horn fuse, and the horn control circuit to the horns. The BCM may also apply ground to the horn relay control circuit as described above. The horns sound as long as ground
is applied to the horn relay control circuit.
