Regal V6-3.8L VIN K (1997)
Brake Transmission Shift Interlock: Description and Operation
The park lock solenoid prevents shifting out of the PARK position when the ignition switch is in LOCK. ACC or OFF. The BTSI is designed to prevent
shifting out of PARK when the ignition switch is in the RUN, BULB TEST, or START position, without pressing the brake pedal. The BTSI solenoid
and the park lock solenoid are energized when the ignition switch is in the RUN, BULB TEST, or START position. When the park lock solenoid and the
BTSI are energized, the mechanical lock connected to this park lock solenoid is pulled away from the shifter. The stop lamp switch receives ignition
voltage in the RUN, BULB TEST, or START position from the BTSI Fuse and is normally closed, providing voltage through circuit 1135 to the BTSI
solenoid, energizing the solenoid and mechanically locking the transmission shift lever whenever it is in PARK. When the brake pedal is depressed, the
stop lamp switch opens, removing voltage from circuit 1135 to the BTSI solenoid. The BTSI solenoid is de-energized and the mechanical lock
connected to the BTSI solenoid pulls back from the shifter allowing shifting.
COLUMN LOCK
On the Regal with the console shift, there is a lock on the ignition key cylinder, preventing the user from removing the key while in a non-PARK
position until the vehicle has returned to the PARK position.
