If you have navigation on your FX, your passanger seat will only move forward and back, not up or down or recline. This is due to Nav Computer module that they put under the passenger side.
If you are not able to move the seat back and forth then you have something wrong with the actual seat motor that controls the movement of your seat or there might be something blocking the rail that your seat it on to help it move forward and back..
Depending on the miles of your car, you cold take it in and see if it is covered my the MNfg warranty