System Description
The horn system consists of the following components:
| • | Horn switch, part of the steering wheel control pad |
| • | Instrument panel module (IPM) |
System Operation
The vehicle horn system is activated under the following conditions:
| • | The horn switch is depressed. |
| • | The IPM 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 to the horn relay control circuit. The IPM 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.
