Vehicle Theft Alarm: Notes

WARNING: This page is about a different car, the 2016 Dodge Durango. However, it is still accessible from the selected car via links, so may be relevant.

The Body Control Module (BCM) is used in this vehicle to control and integrate many of the functions and features included in the Vehicle Theft Alarm (VTA). In the VTA system, the BCM receives inputs indicating the status of the door ajar switches, the ignition switch (Keyless Ignition Node/KIN), the liftgate ajar switch and the power lock switches. In vehicles built for certain export markets where it is required, the hood ajar switch also provides a hard wired input to the BCM.

The Radio Frequency Hub Module (RFHM) provides electronic message inputs to the BCM over the Controller Area Network (CAN) data bus. The BCM will process the information from all of these inputs and sends electronic messages to the Instrument Panel Cluster (IPC) over the CAN data bus to control the security indicator as appropriate. The BCM sends hard wired control outputs to the Power Distribution Center (PDC) to control the hazard warning lamps and to energize or de-energize the horn relay as appropriate.

The hard wired circuits between components related to the VTA system may be diagnosed using conventional diagnostic tools and procedures. Refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin out information and location views for the various wire harness connectors, splices and grounds.

However, conventional diagnostic methods will not prove conclusive in the diagnosis of the VTA system or the electronic controls and communication between modules and devices that provide some features of the VTA system. The most reliable, efficient and accurate means to diagnose the VTA system or the electronic controls and communication related to VTA system operation requires the use of a diagnostic scan tool.

Following are paragraphs that briefly describe the operation of each of the VTA features. See the owner's manual in the vehicle glove box for arming and disarming procedures, use and operation of the VTA.