Brake Lamps

WARNING: This page is about a different car, the 2014 Dodge Journey. However, it is still accessible from the selected car via links, so may be relevant.

The brake (or stop) lamps and the Center High Mounted Stop Lamp (CHMSL) each have a path to ground at all times through a takeout and eyelet terminal of the body wire harness that is secured by a ground screw to the body sheet metal within the passenger compartment. The Controller Antilock Brake (CAB) (also known as the Antilock Brake Module/ABM) monitors a hard wired input from the brake pedal position sensor, which is actuated by movement of the brake pedal arm. When the CAB receives an input from the brake pedal position sensor indicating movement of the brake pedal arm it responds by sending the appropriate electronic brake lamp switch status message to the BCM over the CAN data bus. The BCM then controls brake lamp and CHMSL illumination through High Side Drivers (HSD) on the left and right stop lamp control circuits. The brake lamp function of the trailer tow wiring is also controlled by an output from the BCM based upon the electronic brake lamp switch status messages received from the CAB.