How to Diagnose Chevrolet Tahoe Window Regulator
If you are having problems with your Chevrolet Tahoe window regulator, chances are, your windows will either not move or move slowly. Here are the actions you need to take:
Windows are not moving at all
There are three possible reasons why windows don't move: fuse, relay, and switch or wiring. Take note that each part presents a slightly unique problem. A blown fuse will disable all the windows. So if the problem is on a particular side, the fuse is okay. A bad relay will also disable all the windows. So if all the windows are not working, but the fuse is good, check the relay. Remove the relay from its socket and use a short piece of wire to connect the two points in the socket where the relay makes contact. If the windows work, your relay is bad and there's no other way, but to replace it.
Windows move slowly
Since the windows are still moving, the problem is definitely not the relay, switch, or fuse. It could be the window motor or that window the mechanism is dragging. First check the voltage of the power window motor plug located inside the door panel. (Refer to your repair manual for instructions on how to remove the door panel. Or, you can simply locate and remove all the screws to remove the door panel.) If there's not enough voltage, change the motor. If the voltage is okay, check the window mechanism. In most cases, window mechanism needs lubrication.
Window is working on one side
If any of your window is not working, the problem could be bad wiring, bad switch, or bad motor. Check the switches first. Each window has its own switch. The best and easiest way to check one of the switches is bad is by using the good switch and test it to the side that's not working. If it works, then you need to replace the switch. If the switch is good, check the wiring. If the wiring is good, check the motor. Refer to the instructions above (windows move slowly).