MY WIFE WAS DRIVING A 98 TOYOTA SIENNA WITH KIDS ON THE FREEWAY IN A COMUTER LANE. ALL OF A SUDDEN THE STEERING WHEEL STARTED VIBRATING AND LOCKED IN LEFT POSITION. AS A RESULT THEY ENDED UP CRASHING IN THE MIDDLE DIVIDER HEAD ON. THE VAN TOOK A 180 DEGREE SPIN AND HIT FROM THE BACK. WE HAVE DONE 99000 MILES ON THIS VAN IN LAST 5 YEARS. THIS IS TOTALLY A MALFUNCTION OR MECHANICAL FAILURE OF STEERING WHEEL. WE HAVE DONE LONG TRIPS WITH OUR VAN IN THE PAST 5 YEARS AND NEVER HAD PROBLEM. ALSO THE AIR BAGS DID NOT OPEN UP EVEN THOUGH THE IMPACT WAS SO SEVERE.