Operation is identical to:
WARNING: This page is about a different car, the 2002 BMW M Roadster, 2002 BMW M Coupe, 2001 BMW M Roadster, and 2001 BMW M Coupe. However, it is still accessible from the selected car via links, so may be relevant.
Removing and installing door trim panel, refer to 51 41 000 REMOVING AND INSTALLING FRONT LEFT OR RIGHT DOOR TRIM PANEL (Z3 ROADSTER, M ROADSTER, Z3 COUPE, M COUPE)