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 energized and impedes the gear selector from being moved from the PARK position. When the Brake Pedal is depressed, battery voltage is no longer applied to the BTSI solenoid. The solenoid is de-energized, allowing the gear selector to move freely from the PARK position.

With a center console, the Automatic Transaxle Control impedes the gear selector from being removed from PARK when the Ignition Switch is in the OFF position. Battery voltage is applied through the Transaxle Range Switch to the Automatic Transaxle Control (ATC) when the Ignition Switch is in RUN, BULB TEST or START. This energizes the ATC solenoid and allows the gear selector to be removed from PARK once the above conditions for the BTSI Solenoid have also been met. The ATC energizes the Ignition Lock Solenoid, and it is de-energized. When the solenoid is de-energized, the Ignition Lock Solenoid inhibits the Ignition Switch from being rotated to the OFF position. With the gear selector in PARK, the ATC supples voltage to the Ignition Lock Solenoid causing the Ignition Lock Solenoid to be energized. This allows the Ignition Switch to be rotated to the LOCK position for key removal.

NOTE: The Automatic Transaxle Control can be overridden manually with the use of an access hole in the right side of the center console. This is done by depressing the white tab on the ATC with the Ignition Switch in the OFF position or with the brake pedal depressed. The Ignition Lock Solenoid can be overridden with the use of an access hole in the bottom side of the lower steering cover.