Sometimes the car window will not roll up or down. Sometimes the car door handle will not open the door. Then you know it is time to take the inside door panel off.
Open the door.
If the lock sticks out of the top of the inner panel, remove it–usually by unscrewing it.
Locate the inside door lever that opens the door. Pull on it so that you can see if there is a screw underneath the lever. Remove the screw and remove the hard plastic casing around the door lever.
Look underneath the armrest. You will find screws that hold the armrest to the door. (Sometimes these screws are under plastic covers that have to be popped out with a flat screwdriver.) Remove the screws. Remove the armrest. If your windows are electric, remove the wires attached to the armrest by squeezing the plastic sides of the plug-ins.
Remove the window crank (if your windows are not electric). Sometimes there is a screw in the center of the crank underneath a decorative cover (old VW Beetle). Pry off the cover and unscrew. Sometimes there is a circlip around the base of the crank. Pry the circlip away from the window crank with a flat screwdriver.
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Use a wide flat putty knife to pry the bottom of the panel away from the metal part of the door. The panel is held to the metal part of the door by means of several plastic grommets, attached to the back of the cardboard panel that fit into holes. Gently pop the grommets out of their holes, trying not to rip them out of the cardboard panel.
Check to see if there are any screws up near the rear-view mirror or on each side of the windowsill (Audi). Remove screws if there are any.
Lift the sill up out of its slot by the window and pull the panel away from the door.
Carefully pull the plastic away from the door so you can see what needs repair.