Theory Of Operation
WARNING: This page is about a different car, the 2024 RAM ProMaster EV. However, it is still accessible from the selected car via links, so may be relevant.
The Keyless Ignition Switch sends a LIN bus signal to the Radio Frequency (RF) Hub. The RF Hub sends a Controller Area Network (CAN) message to the Body Control Module (BCM) which in turn activates the Run/Start relay that provides a 12 volt signal to the Anti-lock Brake System (ABS) Module.