Yesterday on a similar thread someone is having the same basic dead battery problem and one of the replies brought up something entitled "Rapid Response Transmittal Service Action #05-027" for the Jeep Grand Cherokee involving something called the WCM (wireless control module). The subject was indicated as "SUNROOF WILL NOT CLOSE". The condition indicated is that the "(WCM) may enter a mode that causes the vehicle communications bus to remain awake until the battery in completely discharged." The repair "Requires the dealer to Flash WCM (Wireless Control Module)", which apparently "involves selectively erasing and reprogramming the (WCM) with new software."
Like HEMEEE, I research the service manual for the 300 Series and Magnum and could find no mention of such a module. It may exist in a Jeep!?
Let's keep our collective ears to the rail. Something may eventually come our way.