Best bet on that one is the switch(es) are on their way out. Those things are known for failing after a while. The contacts arc when you use the switch and it causes a carbon buildup which stops the thing from working. You have two options, buy new switches (not too expensive except for driver door which is over 100 bucks) or fix the old ones. I suggest trying to fix the old ones first then buying new ones if that doesn't work just for the money savings, especially with the driver switch. You will notice a small rounded rectangle in the hand grabs on each door. pry that off and you will see a Torx screw, pull that out. Next you will need a trim panel remover(looks like a big flat fork). A screwdriver will work but could easily damage the panel. Stick that under the bottom edge and pull away from the door. Move around the outer edge doing the same. Then pull the bottom towards you and lift up to get the top edge free of the window lip (roll down the window to make this easier. You will be able to pop the switch out from underneath at this point real easy. To fix the switches, pull the top of the switch off (lock tabs are on the bottom) then pull off the next layer (again, lock tabs) a small screwdriver works well here. Be careful not to break any of the locking tabs or you will have to get a new switch. Once those two layers are off you'll see the guts of the switch. Their are four contacts for each window the switch controls. Pull them all up gently (dont bend them) and use a screwdriver/small knife/sandpaper/whatever, to clean off the carbon. Before you put it back together put a small dab of dielectric compound on each one to stop this from happening again. That should do it, just put everything back the way you found it and your set. If it didn't work, you have a bigger problem then bad switches. Good luck.