Necessary preliminary tasks

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Open rear side window

Detach rubber seal (1) and rubber guide (2) from trim.

Fig 1: Disconnecting Rubber Seal And Rubber Guide From Trim

Courtesy of BMW OF NORTH AMERICA, INC.

Release screws (1).

Carefully detach trim (2) towards front/top.

Installation:

Fitted foam pieces must not be damaged when trim (2) is pushed in.

Fig 2: Removing Trim On Window Frame

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

If necessary, replace faulty plastic nuts (1).

Fig 3: Identifying Plastic Nuts

Courtesy of BMW OF NORTH AMERICA, INC.