Brake Shift Interlock System
WARNING: This page is about a different car, the 2009 Ford Mustang. However, it is still accessible from the selected car via links, so may be relevant.
The brake shift interlock mechanism is used on vehicles equipped with an automatic transmission. This system is used to prevent shifting from PARK unless the brake pedal is depressed. The brake shift interlock system consists of an actuator attached to the key interlock assembly and necessary wiring. The brake shift interlock actuator (BSIA) is de-energized, locking the floor mounted selector lever in the PARK position. When the brake pedal is depressed, the BSIA is reactivated and the floor mounted selector lever can be moved out of the PARK position.