61 13... Inline connectors, 15-pin, System D2.5
WARNING: This page is about a different car, the 2011 BMW 750xi, 2011 BMW 750Lxi, 2010 BMW 750xi, and 2010 BMW 750Lxi. However, it is still accessible from the selected car via links, so may be relevant.
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.