If the other windows work from the driver's switch assembly, you know the wiring is okay. That leaves the switch and the motor as suspects. There are four sets of contacts in each switch, and if any one of them is burned or pitted, the window will not move in one direction. If the window is all the way up already, watch the dome light when you try to run it up more. If it dims a little, that means the motor is trying to run so you know it's good. That leaves the switch as the problem. On the other hand, if the dome light dims too when trying to run it down, something is stuck in the motor or regulator.
The next step is to remove the door panel and measure the voltages on the two wires to the motor. Take four readings, measure on both wires while pressing the "up" button, and two readings while pressing the "down" button.
Thursday, May 12th, 2011 AT 1:05 AM