System Description
The horn system consists of the following components:
| • | The horn switch, the horn switch is part of the inflatable restraint steering
wheel module |
| • | The horn, vehicle may be equipped with a one or two horn system |
| • | The 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 horn on. The BCM commands the
horn 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 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 horn through the horn control circuit.
The horn sounds as long as ground is applied to the horn relay control circuit.
