No! you can't manually operate the seat functions. A very likely cause of such a problem might be just the switch, and can be cured with a spray of contact cleaner! But if that doesn't fix it quick and dirty you'll need to dig deeper. You will need to determine if the functional problem is control malfunction or mechanical malfunction. The easiest way definatively determine that is to move the seat forwards and upwards as far as possible. From the rear you will be able to look underneath the seat bottom see the square black 4 pin connectors for the five individual electric motors. You can fabricate a pair of wire leads with female connectors on the ends and then one by one disconnect the individual connectors and plug the wire leads onto the large male pins. Then connect the other end of the wire leads to a 12 DC Volt source, that particular seat function will operate. Do this to each connector until you either find the one that operates the seat forward/back function or find all the other operating function and via the process of elimination determine the the forward/back function is actually mechanically inoperable. If you determine that the forward/back function does operate when connected directly to a power source you will likely need to start investigating, the switch operation first, then the wiring, then lastly the memory control unit under the seat.

If you determine that the forward/back function does not operate when connected directly you have an issue with either the electric motor operation or the mechanical gear drive of that function. This situation would likely require a removal of the seat and a closer examination to determine whether the motor or the mechanism is at fault and in need of repair or replacement.

If only this one function will not work and you can get by with only the occasional operation make up and connect a set of leads that you can use by connecting to a cigarette lighter pigtail. Plug the pigtail into the lighter, connect the leads and move the seat in the direction you need, reverse the pole connections to move it in the opposite direction. Coil up the leads and place them out of the way under the seat and keep the lighter pigtail in the glovebox. When you construct the pigtail make it so one wire is six inches longer than the other that way there will be less likelyhood of shorting the two together and blowing that fuse! Good luck!