Rear fuse #27, insanely labeled by the designers "OH BATT/ONSTAR", "OH" presumably meaning "Overhead".
I would not give those designers an ounce of water if I came upon them in the desert, and they admitted they were the electrical team for the GMT360 platform. So simple to make it easier for the owners, but they failed. Didn't even try hard. Idiots. :hissy: