System Operation

WARNING: This page is about a different car, the 2003 Pontiac Sunfire and 2003 Chevrolet Cavalier. However, it is still accessible from the selected car via links, so may be relevant.

The vehicle horn is activated under the following conditions:

The horn switch is depressed.
The body control module (BCM) commands the horn on, if equipped with keyless entry (AUO). The BCM commands the horn 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 panic button is depressed on the remote control door lock transmitter. For further information Refer to KEYLESS ENTRY SYSTEM DESCRIPTION AND OPERATION in Keyless Entry.
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.