61 13... Inline connectors, 6-, 8-pin, System MQS
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.
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.