Since direct connect works, the issue is within the fiver wiring itself.. Often a failing connector,or a loose connection, or a cable not hooked up. Since nothing working out of the convenience center, recommend you start there. In our 2015, same as you described. Pulled out the backside of the center, several cables and splitter, couple of them loose and one not connected to anything.
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Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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