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 Body Control Module (BCM) monitors door lock and unlock inputs from the Remote Keyless Entry FOBIK, Passive Entry, the Center Switch Bank lock switch. and the Driver door lock switch. When the BCM receives a door lock or unlock message, the BCM activates the integral lock or unlock relays, to the bidirectional Driver, Passenger, and Rear Door Lock Motors (integral to the Door Latches) for 370 milliseconds, before returning to the neutral position.

Door Lock: When the Body Control Module (BCM) receives a request to lock all Doors, the BCM provides a voltage signal to the Door Lock Relay Control circuit and a ground signal to the Front Driver Door Unlock circuit and the Passenger Doors Unlock Relay Control circuit, to actuate the Driver, Passenger, and Rear Door Lock Motors to the lock position.

Driver Door Unlock: When the Body Control Module (BCM) receives a request to unlock the Driver Door only, the BCM provides a ground signal to the Door Lock Relay Control circuit and a voltage signal to the Front Driver Door Unlock circuit, to actuate the Driver and Passenger Front Door Lock Motor to the unlock position.

All Doors Unlock: When the Body Control Module (BCM) receives a request to unlock all Doors, the BCM provides a ground signal to the Door Lock Relay Control circuit and a voltage signal to the Front Driver Door Unlock circuit and the Passenger Doors Unlock Relay Control circuit, to actuate the Driver, Passenger, and Rear Door Lock Motors to the unlock position.