For 1990-2009 cars

The brake transmission shift interlock (BTSI) system prevents the driver from shifting out of the PARK position without simultaneously pressing the brake pedal. When energized, the BTSI solenoid locks the automatic transmission control lever.

When pressure is applied to the brake pedal, the following actions occur:

• | The BTSI solenoid is de-energized.

• | The BTSI releases the automatic transmission control lever.