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2nd Row Screen won't turn on when vehicle is running


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I have a 2017 Yukon XL Denali, the 2nd row screen works when the vehicle is on but not running. When I start the engine, the screen turns off. The front and 3rd row displays still work fine. I just got the vehicle so I am not sure when it stopped working. I saw a similar post with a fix for the display not working at all but that isn't the issue I am having. Any suggestions? 

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