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I would look for the wiring diagram for the factory unit. I bet there is one.
 

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This link should get you to electrical diagrams and descriptions for operation.

https://www.gmupfitter.com/pdflists/view/36

My understanding is these "upfitter" manuals are to allow aftermarket suppliers enough information to offer accessories, so it should be just what you need.
 

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I used the USB port on the center console, but since my amp has the auto turn on sensor thing, I was able to disconnect it.
 
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