Check with your local library, the usually have repair manuals like Chilton. You most likely have a switch or actuator problem. When you activate the switch, check for a noise or see/feel if one of the activators tries to jump or move. If it tries to move and will not, the actuator is bad. If it does nothing the switch is probably bad.
The switch should not be hard to replace. The actuator is more difficult, the seat must be removed. Locate the proper actuator, the seat track assy. may have to be removed from the seat frame. A basic set of hand tools is all required, give yourself a Saturday to complete the repair.
