2004 e53 X5 4.4i Rear Wiper Relay Loc
 

I've searched Google, images etc., but cannot find an image showing a definitive location of the rear wiper relay. I purchased a wiper motor (used) and it was working then quit working. The ebay vendor suggested I check the relay but I have no clue. The closed I can surmise is behind one of the rear access panels from the "luggage" area. Any help to nail this down would be greatly appreciated.

Thanks!