Power seat

I'd get at the seat motor, horizontal, forward and backward. Take wire connector loose from proper seat motor. Use jumper wires from battery for voltage and ground to the motor, do use inline fuse just in case. See if the motor will move forward and backward, properly. It's a reversing motor, to get it to move the other way, reverse the wire leads. If it works properly with the jumpers but won't otherwise, I suspect the control switch. If it only moves one way with the jumpers, I suspect the seat motor is faulty and you need to replace it. You could look at it, see if anything mechanically wrong instead of electrical. I can't see much from here.

You may need a new motor for this function.

Thanka, all of the above answers are helpful.