Interesting. I have 2006 GMC Sierra with same system. I will give this a try. Like you have been trying to figure out why heat works, but not air. I did have truck sit for a while and had to change battery and then sat more and had to jump battery.

Thanks!

Thanks … same truck

I tried but couldn’t push the buttons at same moment

So this only for a dorman control?

Where do I find the list of setting numbers?

Worth a try but didn’t help. Thanks anyways