TL*THE CONTACT OWNS A 2009 GMC ACADIA. WHILE THE VEHICLE WAS PARKED AN OCCUPANT WAS STANDING UNDERNEATH THE LIFT GATE AND THE DOOR SUDDENLY BEGAN TO CLOSE ON ITS OWN. THE OCCUPANT SUSTAINED SCRATCHES TO HER HAND AND WAS ABLE TO AVOID BEING STRUCK. THE CONTACT STATED THERE WAS A SAFETY FEATURE FOR THE LIFT GATE TO OPEN AUTOMATICALLY IF SOMETHING WAS UNDERNEATH IT WHILE IT WAS CLOSING BUT IT DID NOT FUNCTION. THE CONTACT ALSO STATED WHEN THE LIFT GATE OPENED HALFWAY IT AUTOMATICALLY BEGAN TO CLOSE. THE FAILURE OCCURRED CONSTANTLY. THE VEHICLE WAS NOT TAKEN TO A DEALER FOR DIAGNOSTIC TESTING. THE APPROXIMATE FAILURE MILEAGE WAS 30,894.