 There were no fault codes because we always start with codes, right? We always start with heart rate and blood pressure. We look at the basics. We look at the vitals. And there was nothing there. And then I read a wiring diagram. And the wiring diagram pointed towards that on low beam, there is something called a headlamp driver module, which is nothing more than an integrated circuit board fancy relay that GM plugs in under the hood in position number 46 in the underhood fuse box.