61 13... In-line plugs, 2-pin, System MDK 3 plus 2.8
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2016 BMW 328i xDrive, 2016 BMW 328d xDrive, 2015 BMW 328i xDrive, 2015 BMW 328d xDrive, and 2014 BMW 328i xDrive. However, it is still accessible from the selected car via links, so may be relevant.
Special tools required:
Unlock lock (1) on outside at retaining hook and slide out lock (1) to side.
With special tool 61 0 316 (61 1 136), unlock contact and pull out cable with contact (1) towards rear.