I checked the circuit continuity and it is fine. I checked all the bulbs and only one is out. Replaced the bulb but the rest of the lights should stay on, they are not serially connected. All four tail lights and license plate light are out. I narrow it down to the rear light relay but I can't locate where it is.If all the light's are out it's possible the plug harness has come undone. Should be on the drivers side behind the light itself. May have to pull the trunk liner away to see it. I'd check that first.
I can check in posting some diagrams but it will have to wait till I go home again. Which may be a while.