WHILE TRAVELING AT 20 MPH PASSENGER'S SIDE SEATBELT DID NOT HOLD PASSENGER WHEN VEHICLE REAR ENDED ANOTHER VEHICLE. PASSENGER SIDE SEAT BELT SPRING INSIDE OF THE MECHANISM BROKE, THIS SPRING STOPPED SEATBELT FROM COMING OUT OF SEATBELT RETRACTOR IN COLLISION. PASSENGER WAS THROWN AGAINST WINDSHIELD, AND INJURED NECK AND HEAD. CONSUMER HAS CONTACTED DEALER. *AK