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
in Keyless Entry. |
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 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
horn sounds as long as ground is applied to the horn relay control circuit.
