Shift Interlock: Description and Operation

CIRCUIT OPERATION:
Shift interlock prevents the driver from shifting vehicle out of park unless the brake pedal is depressed with the ignition switch in RUN. Once the brake pedal is depressed. the solenoid Is de-energized. The restrictor arm moves clear of the shift lever arm in the steering column, allowing the gear selector to operate normally.

The shift interlock system can be overridden and the vehicle can be shifted by turning the ignition switch to OFF (and opening a door with retained accessory power). This removes battery voltage at the solenoid, leaving it de-energized.