Theory Of Operation
WARNING: This page is about a different car, the 2020 Jeep Renegade. However, it is still accessible from the selected car via links, so may be relevant.
The Body Control Module (BCM) provides a voltage output through the Left and Right High Beam Driver circuits to the Front or Tail Lamp Assemblies. A ground path for the Front and Tail Lamp Assemblies is present through the harness to the body sheet metal.