M.B. Doc is likely correct. The seat problem everybody has and it is the relay. The window problem is less common, but I had the same problem in a rear door. That is caused by a CAN control module (computer module). If M.B. Doc says it controls the mirror also then it probably does. I don't know why they go bad. I got one from a junk yard and it is going fine for 2 years now. They guaranteed it would work which was nice.

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra