Normal Operation
WARNING: This page is about a different car, the 2005 Mercury Montego, 2005 Ford Freestyle, and 2005 Ford Five Hundred. However, it is still accessible from the selected car via links, so may be relevant.
The smart junction box (SJB) supplies voltage to the stoplamp switch through circuit 1140 (VT), when the ignition switch is in the RUN/START position. When the brake pedal is applied, voltage is routed to circuit 810 (RD/LG) to the anti-lock brake system (ABS) module.