Principles of Operation

Principles of Operation - Automatic Parking Brake Release
The automatic parking brake release consists of these components:
^ Release actuator
^ Electromechanical solenoid
^ Gearshift lever position switch
^ Parking brake warning indicator switch
^ Wiring harnesses connecting the various components

When the parking brake is set and the transmission is shifted into REVERSE or DRIVE, the gearshift lever position switch closes. The instrument cluster module energizes the electronic parking brake release motor. Once the parking brake is released, the parking brake warning indicator switch opens and releases the actuator. The solenoid is energized only when both the parking brake warning indicator switch and the gearshift lever position switch are closed with the brake pedal applied.