Vehicle Theft Alarm: Notes

WARNING: This page is about a different car, the 2020 Chrysler 300 and 2019 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.

The Body Control Module (BCM) and the Radio Frequency Hub (RF-Hub) are used on 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, the decklid ajar switch and the power lock switches. In vehicles built for certain export markets where it is required, the hood ajar switch and the Intrusion Transceiver Module (ITM) also provide inputs to the BCM.

The BCM processes the information from all of these inputs and sends the appropriate electronic messages to other Electronic Control Units (ECUs) over the Controller Area Network (CAN) data bus. The BCM internally controls the output to the hazard warning lamps and sends a control output to energize or de-energize the horn relay. The RF-Hub relays the status of the ignition and all RF commands received from the Remote Keyless Entry (RKE) buttons of the FOB with Integrated Key (FOBIK) to other electronic modules over the CAN data bus.

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.