Shift Interlock: Description and Operation

A brake/shifter interlock system consists of the following:
^ ignition switch
^ brake pedal stoplight switch
^ brake shift interlock module
^ brake shift interlock solenoid assembly (attached to key interlock assembly)
^ necessary wiring

On floor-shift vehicles, the ignition/shifter interlock cable:
^ locks the floor shift transaxle range selector lever in the PARK position when the ignition switch is in the LOCK position.
^ requires the floor shift transaxle range selector lever to be in the PARK position to turn the ignition switch to the LOCK position.

Shift Interlock Switch
The shift interlock mechanism is to prevent shifting the transaxle out of the PARK position unless the brake pedal is applied. The shift interlock system consists of the following components:
- An actuator assembly attached to the ignition switch.
- Necessary wiring.

The actuator is energized when the ignition switch is turned to the RUN position. This locks the floor shifter in the PARK position.

When the brake pedal is applied and the stoplight switch is activated, the shift lock actuator is deactivated and the floor shifter can be moved out of the PARK position.

The ignition / shifter interlock cable locks the floor shift lever in the PARK position when the ignition switch is in the LOCK position. It also requires the floor shift lever to be in the PARK position to turn the ignition switch to the LOCK position.