Removal Procedure

Perform the following steps in order to inspect the window latch assembly for proper adjustment:
1. 1.1
  
  Hold the outside window handle.
2. 1.2
  
  Try to move the window in and out.
  If the latch is misaligned to the striker, a rattle condition will exist.
3. 1.3
  
  Inspect the window for a snug fit against the top and the sides of the body opening.
If the latch is misaligned and/or the window is not snug against the weatherstrip, adjust the latch using the following procedure.

Fig 1: Locating Window Latch Assembly
Courtesy of GENERAL MOTORS CORP.
Remove the endgate or the liftgate trim panel. Refer to TRIM PANEL REPLACEMENT - END GATE or TRIM PANEL REPLACEMENT - LIFT GATE
Remove the endgate cover. Refer to END GATE COVER REPLACEMENT .
Use a screwdriver in order to carefully pry the window latch forward and backward.
This will help to loosen the window latch nut.
Adjust the latch assembly location.