51 34... Removing and installing/replacing window guide rail of rear door, rear left or right

Version with roller sun blind:

Remove roller sun blind on fixed door window. Refer to 51 16 400 REMOVING AND INSTALLING OR REPLACING SUN BLIND AT FIXED SIDE WINDOW OF LEFT OR RIGHT REAR DOOR .

Version without roller sun blind only:

Remove cover (anti-trap protection) on door window frame. Refer to 51 34 160 REMOVING AND INSTALLING/REPLACING COVER (ANTI-TRAPPING PROTECTION) ON DOOR WINDOW FRAME (REAR DOOR), INSIDE LEFT OR RIGHT .

Release screw (1).

Version with roller sun blind:

Installation: 

Holder (2) on door trim panel must not be damaged.

Release screws (1).

Version with roller sun blind:

Installation: 

Remove holder (2) for roller sun blind.

Pull rubber guide (1) out of window guide rail (2).

Slide window guide rail (1) downwards until guide (3) is free and then pull out towards top.

Installation: 

1. Threads (1) and guide (2) of window guide rail (3) must not be damaged.
   Fig 4: Identifying Threads And Guide Of Window Guide Rail

   Courtesy of BMW OF NORTH AMERICA, INC.