Shift Interlock System
WARNING: This page is about a different car, the 2005 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
The shift interlock system prevents the shifting from PARK unless the brake pedal is depressed. The shift interlock system consists of a shift lock actuator mounted either on the base of the steering column tube or the floor shifter. If the ignition switch is in the RUN position, the shift lock actuator is continually on unless the brake pedal is depressed.