If either of your car's windows are cracked or broken, you will need to install new glass. The window glass is contained within a regulator inside of the door that controls the window as it moves up and down. You will need to get inside of the door in order to remove the old glass and install the new, which means disconnecting and removing the door's inner trim panel.
Removing the Trim Panel
Before disconnecting the door's inner trim panel, make sure that the window is all the way down. Disconnect the negative battery cable, especially if you have power doors and windows. If the door has manual windows, remove the window crank; insert a hooked tool or rub the edge of a cloth behind it to disconnect the retaining clip. For a door with power controls, pry off the control panel bezel with a trim removal tool and disconnect the electrical connectors. Locate and remove all of the mounting screws to the panel; some may be concealed by small trim plates, while some are within the door handle. Lift the panel upward to disengage all of its retaining clips, pulling it away from the door and disconnecting any other electrical connectors.
Removing Old Glass
The inside of the door is protected by a water shield that you must peel away to reach the window. You will also need to pull off the weather stripping at the bottom edge of the window frame, and you might have to disconnect the speaker from the door by removing the mounting screws to reach the window. Disconnect the bolts attaching the window glass to the regulator, then push the glass up through the door until you can pull it the rest of the way out. Use extreme caution if the glass is cracked or broken.
Installing New Glass
Insert the window glass down into the door frame until it is seated within the regulator. In some vehicles, it may be easier to push the glass upward through the window frame's bottom edge and back down through the door. Once you know that the glass is properly in place within the regulator, attach the mounting bolts. Reattach all components, like the speaker and the weather stripping, then put the water shield back in place. Reconnect the inner trim panel to the door in the reverse order of removal.
