I only have the seat-back tilt motor on my seats. Had an issue where the tilt function was binding and the tilt wasn't working properly. I opened the plastic cap on the outer lower side of the seat back. The end of the spline (rod) that is driven by the motor had slid toward the console and was no longer engaged on that side of the seat, causing the seat back to twist when I was trying to tilt in either direction.
Slid it back into place and the seat worked fine again. Sounds like your problem is likely related to the switch as Rick3000 suggested, but it might be worth a look. Good luck!
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'01 Boxster S (purchased new) triple black, litronics, cruise, heated seats,18's.
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