Removing both C-pillar trim panels

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

Removing C-pillar trim panel

NOTE: Schematic diagram is for example purposes. Some parts may differ in certain details

Unclip the clamp (4)
Unclip clips (3)
Guide out the C-pillar trim panel (2) from the guides to the front
Feed the C-pillar trim panel (2) out of the lip of edge protection (1)

Courtesy of BMW OF NORTH AMERICA, INC.
If applicable, remove the clips (1) and the clamp (2) and insert on the trim panel

Courtesy of BMW OF NORTH AMERICA, INC.