Automatic Transmission Shift Lock Control Description for Pontiac Grand Prix 1998

The Brake Transaxle Shift Interlock (BTSI) system prevents the driver from shifting out of PARK without simultaneously pressing the brake pedal. The energized BTSI solenoid locks the automatic transaxle control lever.

The de-energized BTSI solenoid releases the automatic transaxle control lever when pressure is applied to the brake pedal.