remove the door handle, then the interior door panel. Get the window up and down switch and then begin testing it to see if you are getting current to the switch, and from the switch to the electric motor that drives the window up and down. If you can bypass the switch and jump 12 volts past the switch, and the morot works and the window moves, then it's the switch. If you bypass the switch and the motor does not operate the window, then the motor is probably bad. More than likey it is the switch........but these are ways to tell. You will need a multimeter to check voltage levels and a jumper wire to bypass the switch. You should buy a door panel removal tool too. It will save you money before you bust the door panel trying to pull it off. It slips behind the door panel and pops the plastic screws that hold the door panel in place. And mkae sure you look all around the door panel for hidden screws. Designers spend hours trying to hide them from sight.