Thank you so much for this information! It’s exactly what happened to me, instead of running in circles I bought the fuse relay box and replaced just like in this video and it worked! I have a 2015 Chevy LTZ Duramax so I hope it helps someone else with this problem as well! Thanks again for the video!
That is a strong possibility. It could be a stuck relay. There are relays built into the fuse block that are non-serviceable. Another possibility would be a bad switch but usually the switches work or they don't.
