Shift Interlock: Description and Operation

When the ignition switch is in the RUN position or when Retained Accessory Power (RAP) is active, the shift interlock system prevents the driver from shifting the vehicle from park until the brake pedal is depressed. Pressing the brake pedal de-energizes the shift interlock solenoid. The restrictor arm moves clear of the shift lever arm, allowing the gear selector to operate normally.
To override the shift interlock system and shift the vehicle, turn the ignition switch to the OFF position. This removes battery voltage at the shift interlock solenoid, leaving the solenoid de-energized.