61 13... In-line connectors, 30-pin, System D2.5
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.
Special tools required:
Carefully pull external connector (1) in area of retaining lugs (2) apart slightly.
Pull internal connector (3) until limit position in direction of arrow.
With special tool 61 0 303 press back retaining hook(4) of corresponding contact and pull out cable with contact.