2000 GMC Sierra Power mirrors do not work

Question edited for clarity.

This is a job for an auto-electrician unless you can read wiring diagrams.

Yukon
https://www.google.com/search?q=1994+GMC+Yukon+power+mirror+wiring+diagram

Sierra
https://www.google.com/search?q=2000+gmc+sierra+power+mirror+wiring+diagram

..

I had this happen on my 2004 also. I have the climate zone control module that allows for adjustment for driver or passenger temps. I had to cycle between hot and cold on the passenger side and switch it between defrost and feet, then power off everything for a long period of time using the power button on the control, this finally got the solenoid to become unstuck. If that doesn't work then you have to get into the heater/air ducts under passenger side, which is difficult, to manually unstick or replace the locked solenoid.

I would raise the hood and check the powerwindow fuse..

The power window switch is actually a drivers door module. They are common for going bad. You have a bad one.

FUSE AND MAYBE LOOSE WIRE CONNECTION

go to a glass shop they will replace just the glass I just had mine done

Will probablly require new motor in mirror, or contacts in switch have failed.

the main switch is wore out, Had the same problem the dealer install new switch 100 dollars for the part 125 for labor good luck

I had the same problem in my wife's 2003 Yukon Denali. The power seats and passengers side window wouldn't work. Turned out to be a blown Buss Type fuse in the Underhood Fuse Block. It is the one marked MBEC 1 50amp. Hard to tell if the are blown so look very carefully. Should look like a hoop with two shiny solderlooking bubbles on either side. On my blown fuse, it caught my attention because it looked like the solder was missing and I had to look very closely to see the bottom of the "hoop" was open. They are very hard to remove and must be pulled straight up.
This type of fuse looks like a red square with a clear plastic top showing the fuse link under the plastic. On my vehicle it is on the top row second one from the left.