Find the pump in the drivers door, and check the rod coming off it moves when you lock/unlock the door. If it doesn't then thats the problem, try moving the rod by hand in this case and see if the CL pump springs to life.
If it does, then all you need to do is figure out why the rod isn't moving, normally the plastic lever on the lock snaps or the rod just pops off.
If the rods & pump all move as they should, then start looking at the wiring, especially where it runs thru the rubber door boots!