Shift Interlock System

SHIFT INTERLOCK SYSTEM

DESCRIPTION
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.

Fig. 335 Ignition Key/Switch Positions:

Refer to the following chart that expected shifter response, depending on ignition key/switch (Fig. 335) and brake pedal positions.

OPERATION

Fig. 336 Ignition Key/Switch Positions:

The Brake Transmission Shifter/Ignition Interlock (BTSI) is engaged whenever the ignition switch is in the LOCK or ACC position (Fig. 336). An additional electrically activated feature will prevent shifting out of the PARK position unless the brake pedal is depressed at least one-half inch. A magnetic holding device integral to the interlock cable is energized when the ignition is in the ON position. When the key is in the ON position and the brake pedal is depressed, the shifter is unlocked and will move into any position. The interlock system also prevents the ignition switch from being turned to the LOCK position, unless the shifter is in the gated PARK position.

Shift Interlock System Operation Inspection:

The chart describes the normal operation of the Brake Transmission Shift Interlock (BTSI) system. If the expected response differs from the vehicle's response, then system repair and/or adjustment is necessary.