Brake Transmission Shift Interlock (BTSI)

The Brake Transmission Shift Interlock (BTSI) system prevents the automatic transaxle from being shifted out of Park unless the brake pedal is depressed. When the brake pedal is depressed, the BTSI solenoid releases a magnetic lock, enabling the shift cable to move and the shift lever to operate. When service requires it, the BTSI system can be overridden by turning the ignition lock to "OFF". This removes battery voltage from the solenoid and leaves it de-energized.