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ok ill answer this one as i have a 01 alero GL coupe wtih the sun and sound package and full aftermarket gear. #1. stick your key in the ignition. #2. open your driver's side door. #3. listen to where the warning chime is coming from. if the chime is coming from the dash behind the head unit then you do NOT have the class 2 system and the factory head unit is nothing but a worthless POS that you can take out and replace with only a basic scosche wiring harness. if the chime is emanating from the driver's side door speaker then you have the class 2 system and to keep all your warning chimes you need to EITHER: A. Relocate the stock HU, or B. buy a GMRC01 which will reroute all your warning chimes thru that little test speaker they give you with the GMRC01 package for $99.95. find the place where the warning chimes emanate before doing anything. kevin
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