GMC Troubleshooting Questions? Ask a Mechanic for Answers
To manually raise the window, we would need to remove the rear gate trim and unplug the motor, then remotely power and ground the motor from a battery. If I can get your year model I can post some diagrams to help?
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Use the diagrams below. Tell me if your model has the motor design that you can not get to the 2 motor wires by themselves.
Use the 2 links below.
Power the orange wire
Ground the black wire pin 8
Power the tan, and ground the gray wire to move it up.
I am not going to be able to keep up with the flow of the post with 3 week delays, I help to many customers and need things to stay fresh on my mind to perform my best. I will opt out and see if another can try.