Well I know this is a very old thread but jrdm01's posts did indeed help me diagnose the exact same problem that he had. My drivers side front seat won't go forward or back but does everything else. I too hear a click under the seat when I press the appropriate button so it must be the relay. Luckly my seat isn't all the way back and I can tilt the seat and the backrest forward to expose the back bolts. I just applied some liquid wrench on one of them as it is pretty rusty so we'll see what happens when I get the seat out. Hopefully I'll be able to find a cheap used relay to replace the one that is there.

I just wonder if it's still possible it could be the wiring going from the relay to the motor since I hear a click, but then jrdm01 heard a click to and the relay had to be replaced. I am not even sure how to test the wire going from the relay to the motor.

Any thoughts anyone?