I would have thought it would be a simple plug and play. I haven’t removed the lamp assembly and looked, but I figured that there’s already a wiring harness there. I couldn’t see it being anything difficult since it’s only a $250 factory option. Cheap options usually mean fast and easy. If it was $1,000 option, I’d believe there was much more to it than just a simple harness plug in.
I guess I will call GMC and see what info I can find out.