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Listen to your warning chimes, if you dont have the uplevel stereo, then you probably DONT have the class 2 databus system. if you do the warning chimes will be coming thru the driver's side door speaker. if they are NOT coming thru the driver's side speaker just buy a cheap ass scosche wiring harness from walmart and call it a day. if the warning chimes ARE emanating from your driver's side door speaker then you DO have the class 2 databus and you WILL either need to relocate your factory headunit OR buy the GMRC01 wiring harness. youll keep your warning chimes and have no worries wiring the aftermarket headunit cuz the GMRC01 also has the power, ground and 12 volt constant lead. Alpine CD players are top notch stuff. i got my GMRC01 for $59.95 cuz i have a good friend at a stereo shop who ran me a dirty deal on that thing, its normally $99.95. just check for your warning chimes and youll find out what you need
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