TL* THE CONTACT OWNS A 2012 TOYOTA RAV4. THE CONTACT STATED THAT THE REAR PASSENGER SIDE SEAT BELT PRETENSIONER TIGHTENED INDEPENDENTLY. THE FAILURE OCCURRED WITHOUT WARNING. THE CONTACT STATED THAT THE SEAT BELT HAD TO BE CUT BY ANOTHER DRIVER. THE SEAT WAS REPLACED BY THE CONTACT'S HUSBAND. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. A TOYOTA TECHNICIAN INSPECTED THE VEHICLE AND DETERMINED THAT THE VEHICLE HAD PERFORMED ACCORDING TO FEDERAL MOTOR SAFETY STANDARDS. THE CONTACT'S SUFFERED BRUISING FROM THE SEAT BELT, WHICH DID NOT REQUIRE MEDICAL ATTENTION. THE FAILURE MILEAGE WAS APPROXIMATELY 49,000.