I originally had the 04 Audiophile system. Now I have aftermarket speakers, amps, and sub, but with OEM Adrenalin head unit. I also have an aftermarket alarm but I do not have the auto start kit installed. I have no other electronic items.
I found this connection unplugged and had no problems. Now that I've reconnected it, I don't see anything different.
Ey, you guys that guessed illumination were right. Early this morning I dimmed the interior lights and lo and behold, the entire center stack (radio and HVAC) dimmed as well. Never noticed it before, I guess this thing's been unplugged a really long time. Thanks!