I never heard of it on this car (yet...). I had a similar problem with the drivers headrest not working. In that case it was another case of failed solder joint on single-sided circuit board. But this time it was right at the motor for the headrest which is in the seat back. I am not sure of the location of the motor for the seat back, but could be in the set back also, otherwise it would be under the seat. The back trim panel of the seat is pretty easy to remove. There are two torx screws on the bottom. If you search for my head rest thread then I tell the size of the torx there. You would then put a volt meter on the motor connections or wire to it and see how far the voltage is getting.

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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