I tried this install over the weekend in a 2022 Chevy 2500. Everything went according to the instructions.
The aux buttons light up when the headlights are on and then when each button is turned on, the small yellow bar is lights up.
However, I don't have any power coming to the 4 wire bundle. I first used a volt meter and got nothing. I thought maybe I had a grounding issue so I tried a simple circuit tester with a long ground wire running all the way to the battery and nothing there either (I tested the ground wire and the tester at the battery and the ground wire was good).
If panel with the 4 aux lights lights up, it seems to me I have power. However, I'm at a loss for what to do next.
Any ideas?