Test A: The Parking Brake Will Not Release

PINPOINT TEST A: THE PARKING BRAKE WILL NOT RELEASE

Normal Operation
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.

Possible Causes
^ Vacuum hose(s)
^ Vacuum reservoir
^ Parking brake vacuum release switch
^ Parking brake vacuum release motor
^ Parking brake control

A1-A3:

A4: