I have a 2002 Chevy Silverado 1500 and all the sudden the window on the passenger side stopped working. Neither the driver or passenger side door switch will make it go down. I tried replacing the passenger side switch but it didn't help. When you press down on the driver side switch you can hear a clicking in the passenger door. Any ideas? Driver switch or window motor?

 

You will need to open up the door ( remove the door panel) to do some troubleshooting... check for the voltages at the motor when the switch is operated...
Check for binding, the motor may be binding up, clean and lube the window rack assembly....
You might also try removing the motor from the window actuator and see if it works, the motor could still be weak or bad, but it will at least confirm wiring is okay if it does try to move in any direction...