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Cant tell you where the chimes are coming from on your car but you can replace your HU without having to get any of those chime module wiring harnesses because its a '99. I believe GM switched to the Class 2 databus system (where the chimes come from the radio on the '01 and up) to save on wiring. I may be wrong but search for the GM Class 2 databus system on the internet and youll find out everything you want to know.
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