Using Windshield Glass Knife

WARNING: This page is about a different car, the 2014 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the ground cable from battery. (Models with wiper deicer)
Remove the trim panel - front pillar UPR. < Ref. to REMOVAL , Upper Inner Trim. >
Remove the cowl panel assembly. < Ref. to REMOVAL , Cowl Panel. >
Disconnect the wiper deicer connector. (Models with wiper deicer)
Remove the stereo camera cover and stereo camera. (Models with EyeSight) < Ref. to REMOVAL , Stereo Camera. >
Remove the molding - front window from the glass - front window, and attach protective tape on the body side of the circumference of the glass - front window.

Fig 1: Identifying Molding, Body Panel, Adhesive, Glass And Protective Tape
Courtesy of SUBARU OF AMERICA, INC.
Remove the glass - front window.
1. Apply sufficient amount of soapy water to the adhesive part and insert the windshield glass knife.
2. While holding the edges of the knife and the glass - front window at a right angle, move the windshield glass knife parallel to the edge of the glass - front window, and cut the adhesive along the surface and the edge of the glass - front window.
  CAUTION:
  - Cutting of adhesive part should be started from an area with wider gap between the glass - front window and the body.
  - Never twist the windshield glass knife.
  Fig 2: Removing Front Window Glass
  Courtesy of SUBARU OF AMERICA, INC.
3. Disconnect the locating pin - front window, and remove the glass - front window.
  NOTE: The locating pin - front window are bonded to the corners of the glass - front window. Use piano wire to disconnect the pins.
  
  Fig 3: Identifying Front Window Pin, Body Panel And Front Window Glass
  Courtesy of SUBARU OF AMERICA, INC.