Originally Posted by CdnoilRAM
You might check to make sure the harness that runs between the door and body is properly connected. You need to pinch both the front and back to remove it, check for corrosion, clean as required, add some dielectic grease for better connections, then plug it back in. Cheapes thing to try.
also you can check the voltage from the back side of the connector and the front side of the connector to make sure that you are getting a signal and they are the same... it may appear to be connected well but may be loose or corroded inside of the connector