OK, so for those of us with stock base model 2005 Cobalts the Metra 70-2202 Harness does NOT connect to your wiring harness. I had to get the 70-2103 harness instead and hook up the red to my accessory in the ignition, But alas i now have a new headunit in mah car! next is subs! then ill get ya guys some pics!
(btw) if your goin to go the 2103 way, i believe the Accessory connector is green, and Use the Brown wire going into the connector. and splice it. Took me forever to figure out which wire was which.
Oh, and another thing, I literally DROVE without my stereo connected, To car toys, and i had Blinker chimes, Door chimes the whole nine yards... so i dont know why everyone is talking about loosing Door chimes and such... might only be on the Pre-amp'd Cars... not sure. And i still have Door chimes, and blinker indicators and all that even with the new 30 dollar metra harness installed.