System Description
The horn system consists of the following components:
| • | Horn switch (The horn switch is part of the inflatable restraint
steering wheel module.) |
| • | Dash integration module (DIM) |
System Operation
The vehicle horn is horns are activated under the following conditions:
| • | The horn switch is depressed. |
| • | The dash integration module (DIM) commands the horns on. The DIM
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. |
| - | When the OnStar® system is used to sound the horns (if equipped.)
For further information refer to
OnStar Description and Operation
in Cellular Communications. |
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 DIM 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.
