I have a 1998 Ford Explorer. The driver's side power door lock switch will only close all locks. It will not open any of the doors locks, with the engine on or off. However, if the engine is off, the remote will open all of the locks. Passenger side switch works fine, with engine on and off. I have changed the driver's side switch, and the same problem exits. I don't think it's the actuator, since it works fine, with the remote and the engine off. Any Suggestions ?