Intermittently the power windows fail to raise or lower. It can be any of the windows. As I activate the switches on the drivers door I hear the click of the switch and the relay(s). But the windows do not move. All the windows fail to operate at the same time. After trying various windows, they all start working again. Any ideas what is in common with all the windows other than the door switches?

 

Does anyone have the schematic for the power window wiring on a 2002 Grand Marquis LSE?