Locating trailer hot wire underhood source 2017 GM

my 2001 Suburban has at least 4 separate trailer wiring fuses and the labeling stinks. So I imagine your 2017 has at least that many. And all labeled in some strange language.

In the end I just went to the bumper and shorted the 12v power to ground and blew the fuse. Even then it took a while to find the blown fuse because it was a physically larger 30a fuse. And not one of the little mini fuses. Oh and it was under the hood in the fuse and relay box.