This worked perfectly!! Thanks so much, I was tearing my hair out!Some Toyota models require the seat to be "initialized." I don't recall the 100 being one of them, but it's worth a shot. Slide the seat all the way forward , seat back all the way forward. Then go all the way back with the seat bottom (with one push). Then All the way back with the seat back. Then try setting seat memory.
If doesn't work, I'd check fuse and wiring. Could be a bad seat memory switch assembly. Mine sets fine when battery is disconnected