You nailed it Johnbigdog! Took the bumper cover off today and discovered the connector that supplies voltage to the harness was filled with dirt/rocks/mud. Have never seen one that dirty. This harness supplies power to the rear park aid sensors (4 each), the license plate lights, the trunk pop...
Thank for the ADD, been lurking but this is my first post. Using FORScan I discovered several Diagnostic Trouble Codes (DTC's) in my Parking Aid Module (PAM) and i get a "Check rear park aid" in reverse. Rear left inner/outer and right rear outer sensors have a "short circuit to ground or open"...