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You say you believe the relay is good. Just a thought, I have had a couple cars where the same relay was used for several things. If you have the same relay for something else maybe you can swap them to see if it works. I did this by putting the A/C relay in place of the fuel pump relay and found the fuel pump relay was bad. If you do this and the car will not run long you know the relay is bad.
Do you have control voltage, usually 24 volts to the relay or relays? If so the relay does not respond it is bad. If not you need to find out why by working backwards thought your control voltage system's wiring to find cause. I hope that gives you a place to start.
your window power relay is either bad,or the switch is not supplying power to the relay to energize the contacts that feed the window motor power,if you can find the relay, push switch and you should hear a click from relay that switch is supplying power to the relay