System Description
The horn system consists of the following components:
• | Body Control Module (BCM) |
System Operation
The vehicle horn is activated under the following conditions:
• | Either of the horn switches is depressed. |
• | The body control module 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
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 either of the horn switches 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.