My 2016 ACE with the Axxera radio does not do this. If you look at the manual you will see there are two video-in connections: one by itself and one with a companion audio connection. The cameras are connected to the video-in without audio which is designed for a back-up camera.
If they were connected to the other video-in then the sound would be expected to come from the companion audio-in, so no sound.
Maybe the newer radios don't have a "backup camera" video-in or maybe they are connected to a video-in with a companion audio-in or maybe there is a way to setup the AV in to not use the audio?
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Ted & Melinda
2016 ACE 27.1
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