61 13... Inline plugs, 2-pin, System MPQ 2.8
WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 2015 BMW Alpina B7L xDrive, 2015 BMW Alpina B7 xDrive, 2015 BMW 750i xDrive, 2015 BMW 750Li xDrive, and 2015 BMW 740Li xDrive. 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 retaining hook (1) with screwdriver and pull out cable and contact (2) towards rear.