I have a 2004 Rainier that is having a unusual issue. the power mirrors will not adjust and they attempt to when the curb assist is on. but the **** will not effect them at all I was going to look for the fuse but when I turned on the curb assist they moved when I put them in reverse.
there wouldn't be a fuse for the switch or would it be the switch itself?

This is an odd one.

I'd look for broken wires in the boot between the front doors and the body.