first check for broken wires in the rubber boot that goes between the door and shell. if all seems ok remove the switch from the door (just pop the handle off) and clean the terminals on the switch, i've had just the same problems recently but 3 windows didn't work, 2 were down to broken wires, 1 side had 4 wires either broken or split and the other was a dodgy switch. another quick test i found to see if it is something other than wiring is test to see if the window will go up and down using the closure feature on the door lock, mine would move doing this, so sort of proved it was eithe