CONSUMER WAS DRIVING AT APPROX 20 MPH HIT ANOTHER VEHICLE HEAD ON.SEAT BELT DID NOT HOLD, LOCKED UP. DUE TO THIS DEFECT, IT CAUSED THE CONSUMER TO HIT WINDSHIELD ,SHATTERED GLASS. ALSO CAUSED NECK INJURIES. TOYOTA CLAIMS CANNOT FIND PROBLEM, AND CLAIMS AIR BAG SHOULD NOT HAVE DEPLOYED. *AK