do you hear any click or whirring when you press the switch?
If not, could be the switch, or a fuse. If you can pop the switch out you can temporarily by-pass it. If you can see under the seat from the rear floor area, perhaps you can find a plug in connector and wiggle that around.
If you DO hear a thunk or whirring sounds when you press the switch, you might have a malfunction in the mechanical part of the electric seat worm gear.
Since you have 3 motors and if none are working under there I think you have an electrical issue at the switch, especially if the other power seat works. Or a fuse issue, and also possibly a relay problem. Worth poking around in there.