Shift Interlock: Description and Operation

The Brake Transaxle Shift Interlock (BTSI) System is designed to keep the driver from moving the gear selector out of "PARK" without the brake pedal being depressed. Battery voltage is applied to the BTSI Solenoid with the Ignition Switch in "RUN," "BULB TEST" or "START" With the brake pedal released, the solenoid is not energized and impedes the gear selector from being moved from the"PARK" position. When the brake pedal is depressed, the solenoid is de-energized, allowing the gear selector to move freely from the "PARK" position.