There are two options, if the motors work and the seat is not stuck you can stick two wires from a portable booster pack direct to the motor and move it back and forth, if the rails are stuck I am afraid you have to get creative , if you can squeeze the hand between the seat and the firewall then you can remove the actual seat from the frame and then that gives you much better access to everything. You can also remove the motors and stick the shafts into a power drill and move the rails each side bit by bit that way but if they are real stuck that might not work.