1996 Toyota RAV4 Electrical System

I GOT THE CAR OFF OF MY BROTHER FOR $4,000.00, IT LOOKS GREAT, NEVER EVER BEEN WRECKED, PAINT GREAT, BRAND NEW TIRES, NEW EXHAUST, NEW BRAKES, ETC. I WAS WAITING ON HIM TO GET THE TITLE NOTARIZED AND HE BROUGHT IT OVER TODAY, BUT THIS MORNING WHEN I SHUT THE DOOR IN THE DRIVEWAY, THE FUSE BOX BURST INTO FLAMES, BOTH WINDOWS CAME DOWN AND LUCKILY I HAD A LARGE FIRE EXTINGUISH IN MY HOUSE AND WAS ABLE TO PUT THE FIRE OUT, OTHERWISE IT WAS PARKED BETWEEN 3 BUILDINGS WORTH 1/2 MILLION $$$ AND SURELY WOULD HAVE BURNED ALL 3 DOWN IF I HAD NOT HAD THE ABILITY TO PUT THE FIRE OUT. THE FLAMES WERE AS HIGH AS THE WINDOW AND THE CAR A TOTAL LOSS AS ALL THE WIRING BURNED UP IN LESS THAN 2 MINUTES IN THE FUSE BOX AREA. IF THIS HAD HAPPENED ON THE HIGHWAY, I AM SURE IT WOULD HAVE BEEN DISASTROUS AND AT THE VERY LEAST THE ENTIRE CAR WOULD HAVE BURNED UP. I AM 55 YEARS OLD AND THIS IS THE VERY FIRST CAR I HAVE EVER OWNED THAT CAUGHT FIRE. *TR

AIR BAG HORN BUTTON FAILED.