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I tried to replace the stock radio with an aftermarket one. Here is what I found out. If your vehicle has OnStar, then the wires in the connector to the radio are not audio wires. They are DATA wires. There is an amp/processor in the rear of the car that delievers a signal to the radio. This is how the OnStar and audible car chimes work through the stereo system.
I talked to a couple different installers about how to do it and they said that you'll need to run new wires from the speakers to the new radio. Best Buy wanted over $150 to install it.
AnswerI have an aftermarket Pioneer CD player in my 2003 Trailblazer, the wire harness for the install is $70-$150 depending on where you go. I suggest having a professional install, it will save you a lot of time, money, and scratched knuckles. my Pioneer deck cost me $300, and the $150 it cost @ circuit city to have it installed was well worth the money in my opinion. They should warranty against theft for a pro-install. They will leave your RCA Preouts in the floorboard so you can run your amp if you supply the RCA cables and request them to do so. Mine had the Bose package so I stuck with my component speakers. Never let anyone tell you that you HAVE to replace the wiring, IF they do they couldn't find their @$$ with both hands and a map. If that offends you then sorry, but the truth hurts. OEM wiring is good enough for Bose so I say it's good enough for me.
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