I recently did some work on the door of my 2003. When the door lock switch is unplugged, the door will not lock. Your fob seems to be working correctly, and the problem is likely in your door. Does the electric door switch work correctly? Perhaps there's a wire loose or corroded. Lock is different from unlock. If the key is in the car, it will complain and prevent the driver from locking the key in the car with the button.