Vehicle Theft Alarm: Description

The Vehicle Theft Alarm (VTA) is factory installed equipment on this vehicle. VTA provides perimeter vehicle protection by monitoring the vehicle doors, the ignition status, the decklid/liftgate, and the hood. The system also monitors interior intrusion, along with anti-tilt protection. If unauthorized vehicle access, intrusion or tampering is detected with either of these systems, either the vehicle horn or an alarm siren (if equipped) is pulsed as an audible deterrent and certain exterior lamps are flashed as a visual deterrent. The anti-tilt and interior intrusion features can be turned off by pressing the button located on the Ultrasonic and Anti-tilt Module (UAM).

The VTA includes the following major components, which are described in further detail elsewhere in this service information:

• Ajar Switches  - An ajar switch is integral to the latch mechanism of each front door, rear door and the decklid/liftgate. In vehicles manufactured for certain markets where it is required or equipped with the optional remote start system, a hood ajar switch is integral to the left hood latch mechanism.
• Alarm Siren Module  - An alarm siren module is located in the right rear wheel well area, behind the splash shield. Refer to SIREN, DESCRIPTION AND OPERATION .
• Body Control Module  - The Body Control Module (BCM) is concealed within the passenger side of the instrument panel. Refer to MODULE, BODY CONTROL (BCM), DESCRIPTION AND OPERATION .
• Radio Frequency Hub  - The Radio Frequency Hub (RFH) is located in the center of the instrument panel below the instrument panel pad and behind the radio display. Refer to MODULE, RADIO FREQUENCY (RF HUB), DESCRIPTION AND OPERATION .
• Security Indicator  - The security indicator is integral to the Instrument Panel Cluster (IPC) located in the instrument panel above the steering column and directly in front of the driver. Refer to DESCRIPTION AND OPERATION .
• Ultrasonic And Anti-tilt Module  - In vehicles equipped with the premium VTA, an UAM is integral to the roof lamp unit in the headliner near the center of the upper windshield opening header panel. Refer to MODULE, ULTRASONIC AND ANTI-TILT, DESCRIPTION AND OPERATION .

The BCM, the IPC and the RFH each contain a microcontroller and programming that allow them to communicate with each other and other electronic modules in the vehicle using the Controller Area Network (CAN) data bus. In addition, in vehicles so equipped the KIN, the RFH, the UAM, the alarm siren module and the BCM communicate with each other using a Local Interface Network (LIN) data bus. Refer to COMMUNICATION, DESCRIPTION AND OPERATION .