WARNING: This page is about a different car, the 2010 BMW 650i, 2009 BMW 650i, and 2008 BMW 650i. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Cable Cabinet (000180)
Courtesy of BMW OF NORTH AMERICA, INC.
NOTE:
(Cable cabinet II, complete) For extended accommodation of adapter cables, measuring equipment and testers