Hey mtbadbob,
So I've also changed out the fuse, I've sprayed the PB blaster like crazy on all the joints. They do have voltage because they move a bit. like the want to come out. My next step I thing is to take them down and take them apart, lube them up real good and see how that goes. I'm out of ideas.
Greetings all,
I have a 2016 high country with the same issue. I've replaced both motors and both switches with no difference. I'm in about 1200-1300 now. unable to find anyone with a solution. I've gone to a Chevy dealership and was told they couldn't help me with motor replacement and to just get rid of these steps. If anyone has any info I'm all ears.