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 lock button on the keyless entry transmitter is pressed
twice within 5 seconds, a horn chirp will sound to notify the driver
that the vehicle has been locked. 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 horns sound
as long as ground is applied to the horn relay control circuit.