TRUCK WAS BOUGHT USED AND DEALER MAINTAINED, IT SAT PARKED FOR 3 DAYS WITHOUT BEING TOUCHED DUE TO SON BEING IN A PICA CAST FROM CHEST TO FEET, AT APPROXIMATELY 2 AM THE LOCKED TRUCK HONKED AND WOKE ME UP, WHEN I WENT OUTSIDE I COULD SEE FLAMES IN THE PASSENGER SEAT SO GOT KIDS OUT OF THE HOUSE AS THERE WAS GAS LINE CLOSE AND CALLED THE FIRE DEPARTMENT WHICH WAS UNABLE TO SAVE THE VEHICLE, AS SOON AS THE DOOR OPENED IT EXPLODED INTO A BIG WHITE BALL NOT EVEN THE TIRES WERE ANY GOOD. FIRE DEPARTMENT SAID IT WAS THE COMPUTER THAT SHORTED OUT AND CAUGHT IT ON FIRE. CONTACTED DEALER AND WAS TOLD THERE WERE NO COMPLAINTS OF THIS HAPPENING BEFORE WITH THE COMPUTERS BUT THEY WOULD NOTATE IT. LOCATION OF OCCURANCE AND WAS RUPERT,IDAHO AND REPORTED TO FORD DEALER IN BURLEY,ID