I spotted this post from SPOOK who advises that:"On the circuit board, there is a relay. It is marked, Matsua JV1aPF-12v. This relay fails. When it fails, no power passes from the circuit board, on which the seat control switches are sited - to the seat motors. The seat will not move."
You have several options:
(a) go to salvage yard. There is no guarantee that relay will be any better.
(b) if you're handy with a soldering iron, remove the relay from the board, and bridge it out, with two short wires
(c) buy a new switch.