Shift Interlock System
| 1 - LOCK |
| 2 - ACC |
| 3 - ON |
| 4 - START |
The Brake Transmission Shifter/Ignition Interlock (BTSI) is a cable and solenoid operated system that prevents the transmission gear shifter from being moved out of PARK without a driver in place.
Refer to the following chart that expected shifter response, depending on ignition key/switch and brake pedal positions. See Fig 1.