[xxxscimitarxxx]

maybe an old thread but i have some of exactly the same symptoms with my 92....both seats lost all function (infact still havent fixed as car has been 12mths off road for brake reasons)

that fuse/relay in the passenger side fuse comp fizzes and gets damn hot without the seats doing anything.

the only issue l have tied it to was the recline swith on base of seat under your right thigh....mine went up in smoke!....seats worked for a while then both suddenly stopped altogether

so seems from your issue that it could simply be burned out wiring that has shorted ....now lve got something to go look for