I've been trying to get the sound system working on my Denali, it has an aftermarket head unit installed by the PO but has not worked since I bought it. I took the head unit out and noticed that the factory pink wire was not hooked up to the remote power feed off the head unit. I hooked it up and still no sound to the speakers whatsoever. Battery feed at the amp exists, all fuses good. I did notice that the rear factory amp under the seat is gone, as well as the rear audio controller aft of the console, will this cause the front factory amp and sub in the console to be inoperative? If this is the case, I will bypass the factory amp in the console but would like to use the Bose sub in there, is this doable with the head unit speaker outputs or do I need a dedicated amp to run this sub? Holler...