Socket housing
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.
Raise lock (1) on housing (2).
Push contact carrier (3) out of housing (2).
NOTE:
Pushing out the contact carrier releases the secondary locks of the socket contacts.
Hold down retaining hook (1) of socket contact in opening of contact carrier with a small screwdriver.
Pull wire with socket contact in direction of arrow as far as secondary lock (2).
Hold down retaining hook in secondary lock (1) again and pull cable with socket contact (2) completely out of contact carrier (3).