61 13... Inline plugs, 3-, 6-pin, System Elo-Power 2.8
WARNING: This page is about a different car, the 2013 BMW X5, 2012 BMW X5, and 2011 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.
Press locking hook (1) in direction of arrow and disengage. Then unlock locking hook (2) and remove lock.
Press down retaining hook with screwdriver (1) and pull out cable with contact towards rear.