2002 BMW 540IA Electrical System Problems

I WENT OUT TO MY BMW 540I AND FOUND THE DRIVER'S POWER SEAT ALL THE WAY BACK IN THE HORIZONTAL POSITION. I DID NOT LEAVE IT THIS WAY, SO THIS WAS CONFUSING TO ME. WHEN I ATTEMPTED TO MOVE IT BACK UPRIGHT INTO A COMFORTABLE DRIVING POSITION, IT DID NOT RESPOND- THE SEAT WAS DEAD. I COULD NOT MOVE IT MANUALLY, EITHER. I WAS FORCED TO DRIVE THE CAR A SHORT DISTANCE TO DROP MY SON OFF AT AN ACTIVITY, SO I DECIDED TO DRIVE IT AND LEAN FORWARD WHILE DRIVING. MY PLAN WAS TO TAKE THE CAR TO MY LOCAL BMW MECHANIC LATER THAT NIGHT AND DROP IT OFF TO BE REPAIRED. MY SON AND I WERE ONLY TWO MINUTES INTO OUR DRIVE, I WAS LEANING FORWARD, AND HE SAID "DO YOU SMELL SMOKE?" I DID SMELL IT, AND WAS LOOKING AROUND TO SEE WHAT WAS WRONG. THEN MY...