Brake Shift Interlock System
WARNING: This page is about a different car, the 2009 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
The brake shift interlock system prevents the shifting from PARK unless the brake pedal is applied. The brake shift interlock system consists of a Brake Shift Interlock Actuator (BSIA) mounted at the base of the steering column tube. If the ignition switch is in the RUN position, the BSIA is continually on unless the brake pedal is applied.