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Head unit upgrade without losing rear audio controls possible???

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I just baught a 2500 Sierra CCSB with Bose. Im looking at double din, middle to high end head units. I know about the axxess wiring harness to maintain door chime and Onstar which mine doesnt have. But im wanting to know if you can keep the rear audio stuff functional too after a change? I doubt it will be used much but I would like to know before i start.

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