Brake Shift Interlock Operation

The BSIA inhibits the selector lever movement from the PARK position by mechanically blocking the detent pawl of the selector lever mechanism. When the brake pedal is pressed (Brake Pedal Position (BPP) switch closed) with the ignition key in the RUN/START position and the transmission in PARK, the BSIA is energized by the BCM, this allows the selector lever to be moved out of the PARK position.