61 13... Inline connectors, 15-pin, System D2.5
WARNING: This page is about a different car, the 2013 BMW 550i GT, 2012 BMW 550i GT, 2011 BMW 550i GT, and 2010 BMW 550i GT. 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.