Theory Of Operation
WARNING: This page is about a different car, the 2022 Chrysler Voyager and 2022 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.
The Body Control Module (BCM) receives the input from the Headlamp Switch requesting Rear Fog Lamp illumination. The BCM provides a Pulse Width Modulated (PWM) voltage output through the Rear Fog Lamp Feed circuit, which connects to the Rear Fog Lamps. A ground path for the lamps is present through the harness to the body sheet metal.