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Total guess here as I've never seen a trailer with two different head units installed, but I would suspect that both head units shared the same radio antenna which is usually installed on the roof of the RV (often a single wire whip antenna).
If this sounds correct, I would pop the inside head unit out, and follow the antenna wire to see how/where it splits. It is possible that there is a small amplifier/splitter that may be require power from the inside HU, or that the antenna wire somehow feeds through the inside HU.
Overall that is a complete guess. but looking at the controls on your outside HU it certainly has an internal radio tuner, so I can only guess that it is no longer getting a signal from the antenna.
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2011 Jayco X19H (purchased 2015)
2008 Jayco 1007 PUP (purchased new, traded for the X19)
2018 Nissan Titan Midnight Ed.
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