I just had this problem on my 2014 Denali. Mirrors were folded while parked, when got back in they wouldn’t return. And realized Power driver seat wouldn’t work and settings in menu were missing. Checked a bunch of fuses, all good. Thankfully found your post before taking it to the shop…disconnected battery for 30 min and all is back to normal. Many thanks to JimCost2014 you saved me a bunch of money!