How do you adjust a driver's seat on a Saturn?

If the adjuster handle under the front of the seat isn't working, get a flashlight and check that the cable that runs across between the tracks is connected to both sides of the seat adjuster. You should be able to see it as a small wire with hooks on either ends and small springs used to hold the hooks in place. Also, while you're under the seat, check to see if any coins are stuck in the seat tracks. They sometimes cause the seat to get stuck... Sometimes the "cable" described in the first answer above stretches and will not pull the latch on the side opposite the handle all the way. In this case you can check to make sure the hooks on each end are secured by the little springs, and check to make sure the plastic tubing goes through the holes in the latches that the hooks go through, and if all else fails, try replacing the wire. You could also try using pliers to put a kink in the wire (it's stiff) to try to shorten it up a bit. But wrap the plier jaws with tape first to avoid nicking the wire.