For 1990-2009 cars

The Brake Transmission Shift Interlock (BTSI) is designed to prevent shifting the transaxle out of PARK without pressing the brake pedal. The shift lock control module controls the shift lock solenoid and the ignition key lock solenoid based on inputs from the CIG and ECU-IG fuses, the stoplamp switch and the shift lock control switch. The shift lock solenoid is provided battery voltage when the ignition switch is in ON or START and the shift lock control switch is in the P position. The stoplamp switch is provided battery voltage from the STOP fuse. When the brake pedal is depressed, a brake signal is sent to the module and the solenoid is energized allowing the transaxle to be shifted out of the PARK position. When the transaxle is shifted to the PARK position, a signal is sent to the module through the control switch and the solenoid becomes de-energized.