61 13... Circular connector, 20-pin, system D2.5
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2013 BMW 335is, 2013 BMW 335i, 2012 BMW 335is, 2012 BMW 335i, and 2011 BMW 335is. However, it is still accessible from the selected car via links, so may be relevant.
Carefully press back retaining tabs (1) of internal connector (2).
Turn internal connector (2) until retaining lugs (1) snap into release groove (3).
With special tool 61 0 303 press down retaining hook (4) of corresponding contact and pull out cable.