even a vehicle unequipped with onstar still needs it. from a mobile technician i know he said that it will communicate with the security system on the radio system. check it out look at back of package and make sure compliant with your vehicle.. and if it doesnt work... you can return anything to walmart ha

Scosche GM2000 2003-up GM Radio Wiring Harness Interface

check out this site for a view of what im talking about. your vehicle is included

you dont need that. the majority of it is the chimes. all you need is the rap power like i posted, everything else works with the old style connector adapter

Hmm, that is odd, the switched power is supposed to come from one of the pins of the 10 pin, I am not sure how the factory unit turns on without that 10 pin being connected.

Does the stock unit actually work without the 10 pin, or does it just illuminate the display?

I am looking over the info from that PDF I linked you to, and I see there is one wire of the 24 pin connector mentioned that is not used for the aftermarket radio, the Orange wire, I wonder if that provides turn on power for the stock unit, if it does I cannot see why there would be another one as a part of the 10 pin.

If you have a multimeter you could set it to 12v, and ground the ground lead, then look for any red, orange, or yellow wires coming from the 10 pin connector, turn the car to ACC, or ON, then test the wires till you find the one that have 12v, once you find it try turning the key to off, then opening the doors, when you find the one with 12v that cuts off when you do this, then that is the wire you want to use for you aftermarket stereo'* switched power wire.
Once you find it I am not sure of a great way to tap into it, they make t-taps that you can use to keep from needing to cut the wire, but I am not a fan of the t-taps.
I'd just use the ATC type tap that Justin linked you to, and run a wire from the switched power at the fuse box.

Welp, I went to walmart and picked up the harness with the interface. Got it in yesterday without a hitch, and it'* working perfectly! Thanks man! I appreciate your help.

That was probably the easiest way to do it, glad it is working for you now.

no problem! i was pissed off for 3 days before i went searching for one! easiest install ever!

I just went to best buy today and they told me it'* a class two radio....no matter what u do with that clip u cannot get power to your radio...its not "smart" enough he said cuz they need the motherboard. .best buy has a clip that is 100$ and it will turn it on because your car computer doesn't want to supply power to it....but he told me to either pay 100$ or I could take the power wire and wire it to the ignition switch...on one wire that is on when the key is on, and off when the key is off. Hope I helped....btw, he said it could cause the airbags to not deploy and seatbelts to not tension up during an accident and he said it would be illegal.....but then again. They want that 100$, so who knows how truthful it was.

Please start your OWN thread rather than digging up one from 4 years ago.