Brake Shift Interlock System

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