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I noticed that the plugs went from green to black (red lock tab on the main interface) on the 2019 1SS non bose. However they still mated with the Sub thump T harness for the 2016-2018 and the signal routing was the same. It does sound like Chevy switched over to an ethernet based communication for the 2019 Model year so it seems like the only option for adding an amp on the 2019s is to tap off of the speaker outputs.
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