I was working on a '95 Contour yesterday and today for the power lock switch on the driver's door not working, but the passenger door switch was fine. The problem was corrosion inside the terminals of the twist lock connector in the driver's door jamb, as Terry mentioned. I had to replace several pins and do some wire splicing to get the problem repaired. Look in the female end of the connector and see if there is green corrosion in it. If so, that's what the problem is.
