good luck, my 550i is at the shop right now getting checked out for the battery drain issue. this is the first time i have ever witnessed the issue, and the SA confirmed that there is a DRAW happening while the car is supposed to be in Sleep mode. I will keep ya posted when they find the bug.

 

Same thing happening to my 07 550i, have appt with the dealer in a few days.

 

Seems that the IBS issue and failed rear door handle comfort access failures are the most common problems with high batterty drain and associated electrical fault messages, including active steering faults and others that occur if the battery drain continues long enough to damage the battery. I had a similar problem, 4 return visits, 2 Comfort access control module replacements (one was faulty) and a replacement battery before they could correctly diagnose the rear door handle unit as the culprit. All on warrantee with no problems since. My dealership treated me well and provided reasonable courtesy vehicles while they fought it out to get to the correct diagnosis. It all worked out in the end