Vehicle Theft Alarm - Description

VEHICLE THEFT ALARM

The Vehicle Theft Alarm (VTA) is factory-installed optional equipment on this model. This system provides perimeter vehicle protection by monitoring the vehicle doors and the status of the ignition switch. If unauthorized vehicle use or tampering is detected, the system responds by pulsing the vehicle horn as an audible deterrent and flashing certain exterior lamps as a visual deterrent.

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

- Door Ajar Switches - A door ajar switch is integral to the door latch mechanism of each front and rear door. Door Ajar Switch - Description.

- Body Control Module- The Body Control Module (BCM) (also known as the Common Body Controller/CBC) is located on the upper left corner of the dash panel within the passenger compartment, where it is concealed behind the instrument panel to the left of the steering column and pedal support bracket. Body Control Module - Description.

- Keyless Ignition Node - The Keyless Ignition Node (KIN) (also known as the IGnition Node Module/IGNM) is located in the instrument panel just inboard of the upper steering column opening. Keyless Ignition Node Receiver - Description.

- Radio Frequency Hub Module - The Radio Frequency Hub Module (RFHM) (also known as the RF Hub) is located on the cab back panel within the passenger compartment beneath the back glass opening and concealed behind the cab back trim. Radio Frequency Module (RF Hub) - Description.

- Security Indicator - The security indicator is integral to the Instrument Cluster (IC) (also known as the Common Instrument Cluster/CIC) located in the instrument panel above the steering column opening, directly in front of the driver. Instrument Cluster - Description.

The BCM and the RFHM 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 the KIN and the RFHM communicate with each other using a dedicated Local Interface Network data bus. Communication - Description.

Hard wired circuitry connects the various VTA system components to each other through the electrical system of the vehicle. These hard wired circuits are integral to several wire harnesses, which are routed throughout the vehicle and retained by many different methods. These circuits may be connected to each other and to the vehicle electrical system through the use of a combination of soldered splices, splice block connectors and many different types of wire harness terminal connectors and insulators. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, further details on wire harness routing and retention as well as pin out and location views for the various wire harness connectors, splices and grounds.