Adjust tension of rear side window - AR67.30-P-4200-03SC

Checking 

1. Move rear side window (1) and window (2) of front door to upper end positions and close front door.
2. Check transition between rear side window (1) and window (2).

   Rear side window (1) must be flush with window (2).

   Fig 1: Identifying Rear Side Window And Driver Window

   Courtesy of MERCEDES-BENZ USA

   Adjust 

   Expose power window of rear side window (1) in lower area to adjust the pretension of the rear side window (1). It is not necessary to remove rear side window sealing rail (1) or rear sidebag unit and it is only necessary to detach the damping material in the lower area of the inner panel.

3. Loosen nut (3) on rear side power window (1) and turn adjustment bolt (4) correspondingly.
   Fig 2: Identifying Nut On Rear Side Power Window

   Courtesy of MERCEDES-BENZ USA
4. Close front door, check again transition between rear side window (1) and window (2); if necessary, repeat adjustment.
5. Open front door and tighten nuts (3).