61 13... Inline connectors, 6-, 8-pin, System MQS
WARNING: This page does not describe the selected car, but rather 27 other vehicles, including the 2017 BMW M6, 2017 BMW 650i xDrive, 2017 BMW 650i, 2017 BMW 640i xDrive, and 2017 BMW 640i. However, it is still accessible from the selected car via links, so may be relevant.
Press lock (1) in direction of arrow and slide connector forward.
Press locking hook (2) downward and slide lock (1) out.
Press down retaining hook (1) with screwdriver and pull out cable with contact towards rear.