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 content theft deterrent system detects a vehicle intrusion. For further information refer to Content Theft Deterrent (CTD) Description and Operation in Theft Deterrent.
^ 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(R) system is used to sound the horns if equipped. For further information, refer to OnStar (R) Description and Operation in Cellular Phone.