61 13 ... In-Line Plugs, 2-Pin, System MPQ 2.8
WARNING: This page is about a different car, the 2007 BMW 550i and 2006 BMW 550i. However, it is still accessible from the selected car via links, so may be relevant.
Press catch on outside in direction of arrow and remove towards top.
Press down arrester hook (1) with screwdriver and pull out cable and contact (2) towards rear.