Normal Operation
WARNING: This page is about a different car, the 2009 Mercury Milan, 2009 Lincoln MKZ, and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
When the brake pedal is applied, the stoplamp switch routes voltage to the smart junction box (SJB) and the PCM through circuit CCB08 (VT/WH).