Necessary preliminary tasks

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 BMW 328xi, 2012 BMW 328i, 2011 BMW 328xi, 2011 BMW 328i, and 2010 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

Remove HOUSING ON EXTERIOR MIRROR
Remove DRIVE for electrically adjustable exterior mirror

Release screws (1) on retaining ring (2).

Fig 1: Identifying Screws On Retaining Ring

Courtesy of BMW OF NORTH AMERICA, INC.

Starting at bottom, unclip catches (1) all round from retaining ring (2) with special tool 00 9 317 .

Remove retaining ring (2).

Fig 2: Identifying Retaining Ring And Catches

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Catches (1) must not be damaged.

Locators (2) for multitooth catches must not be damaged.

Fig 3: Identifying Catches And Multitooth Catch Locators

Courtesy of BMW OF NORTH AMERICA, INC.