Shift Interlock: Description and Operation

A/T Shift Lock System: System Description
^ The selector lever cannot be shifted from "P" (Park) unless the brake pedal is applied and the ignition switch is in the "ON" position.
^ Battery voltage is supplied to the shift lock solenoid by the stop lamp switch.
^ Ground is supplied to the shift lock solenoid by the park position switch (shift selector).
^ With the ignition switch "ON", brake pedal applied and the A/T shift selector in "P" (Park), the shift lock solenoid is energized, allowing the selector lever to be shifted from Park.