Remove the top left and right B-pillar trim panels partially

NOTE: Description is for left component only. Procedure on the right side is identical.

Remove the top B-pillar trim panel partially

Release the B-pillar trim panel (1) from the clips (2) and remove downwards out of the roofliner.
The B-pillar trim panel (1) remains in the vehicle.

Courtesy of BMW OF NORTH AMERICA, INC.