I am having a similar issue, I have power going to the switch which I thought was the issue so I replaced it and come to find out it was not the problem.
I looked at my fuses and I think my trucks fuses are labeled wrong because I pulled the fuse that says goes to the rear window but it still shows power going to the switch when the fuse is out. I included a picture with an arrow showing the fuse I took out on the passenger side door fuse block. Can you tell me is that the correct fuse anyone else has tried or is there another fuse or is there maybe a relay that went bad? I have pulled the rear seat and tried testing the plug going into the motor and it has no power because that was what I was going to replace next or should I try the wiring harness first?
Was the wiring harness hard and expensive to replace?
if anyone can help me with this I would really appreciate it.