WAS DRIVING VEHICLE AND WAS INVOLVED IN A CRASH. UPON IMPACT, MIDDLE ROW PASSENGER'S SEAT BELT FAILED TO LOCK UP , AND THREW PASSENGER ON FLOOR. SEAT BELT REMAINED BUCKLED , AND WAS STILL AROUND PASSENGER. THIRD ROW PASSENGER HAD ALSO EXPERIENCED SAME PROBLEM WITH THE SEAT BEL, FAILED TO LOCK UP. DRIVER'S SEAT BELT WORKED. *AK