DRIVER'S SEAT BROKE WHILE I WAS DRIVING THE VEHICLE. A BOLT SNAPPED OFF UNDER THE SEAT FOR THE MECHANISM THAT CONTROLS THE UP AND DOWN HEIGHT ADJUSTMENT. THE SEAT WAS IN THE HIGHEST POSITION POSSIBLE WHEN IT HAPPENED AND AS A RESULT, THE SEAT DROPPED ABOUT 7-8 INCHES TO THE FLOOR, CAUSING A BACK INJURY FOR ME. WHEN THIS HAPPENED, THE DRIVER'S SEAT GEOMETRY WAS OFF SO SIGNIFICANTLY THAT THE BACKREST WAS RECLINED TOO FAR AND I COULDN'T SEE OUT THE WINDSHIELD OR REACH THE PEDALS. I AM DISABLED AND IT IS A MIRACLE THAT I WAS' IN AN ACCIDENT AS A RESULT OF THIS. I CONTACTED TOYOTA AND THERE HAD BEEN A SERVICE BULLETIN TO REPAIR THE DRIVER'S SEAT IN MY VEHICLE, BUT THE DEALERSHIP NEVER INFORMED ME OF IT, EVEN THOUGH I HAD COMPLAINED SEVERAL TIMES ABOUT THE SEAT LOSING ITS HEIGHT SETTING. NOW TOYOTA WILL NOT REPAIR THE SEAT BECAUSE IT IS OUT OF WARRANTY. I AM THE ORIGINAL OWNER OF THE CAR AND IT HAS 111,000 MILES ON IT. THE SEAT MECHANISMS BROKE WHILE I WAS DRIVING OVER A ROUGH SECTION O CITY STREET IN SAN DIEGO, CALIFORNIA AT ABOUT 12 MPH. I WAS DRIVING IN A STRAIGHT LINE AND SLOWING DOWN TO STOP AT A RED LIGHT WHEN IT HAPPENED. I CAN'T DRIVE THE CAR FOR MORE THAN A FEW MINUTES AT A TIME WITH THE BROKEN SEAT BECAUSE IT IS TOO PAINFUL FOR MY BACK INJURY.