: Open the door and check the wiring harness inside the rubber boot (the "accordion" tube) between the door and the frame. Broken wires here are a common Ford issue due to constant opening and closing.

The prefix "B" targets the body electronics network, which encompasses power windows, door locks, lighting, and side mirrors.

Yes, the fundamental definition remains the same for all Ford, Lincoln, and Mercury vehicles that use the PDM/DDM architecture. However, the specific wiring colors, connector pinouts, and module locations can vary significantly between different models, such as a Ford Focus, Ford F-150, or Ford Kuga. Always use a model-specific wiring diagram for testing.

PDM (Passenger Door Module / Passenger Door Control Unit). Description: Heated Mirror Circuit Open.

The code remains stored in the PDM or DDM, visible only when running a specialized diagnostic test.

: Using a multimeter, check the resistance (Ohms) of the heating element on the back of the mirror glass. A reading of "OL" (open link) or extremely high resistance confirms the glass needs replacement.

: The right turn signal or brake light on a connected trailer may not illuminate.