Yes, yes, yes and I'm not sure. First things first... Do you use Onstar? If not, things get a lot simpler and less costly. The OnStar module does control your chimes and turn signal clicks in addition to OnStar. I have not missed either of these things. If you're not interested in using OS, there is no need for the retention module which is going to be an additional $175. If you choose not to use OS, there is a bundle of blunt cut wires below and to the left of the HU. A little bit of a chore to get to, but not too bad. All the 12v, acc, and ground wires you'll need are here. Tape the unused o