If you have the Axxerra AV614 the volume for the rear mic is controlled by the volume know when the rear camera is on and the transmission is in reverse.
If you have the Axxerra AV615 I don't have a clue. My 614 was just replaced with a 615 and the mic is always on and the volume cannot be controlled when the rear camera is being viewed. I am still trying to figure this one out. My coach was in for annual service and inspection and the dealer replaced the radio, for the third time, under my extended warranty/service. They couldn't get another 614 so they had to install a 615 this time.
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Dave
US Army (Ret)
2020 Entegra Accolade 37TS
2019 Jeep Grand Cherokee Trailhawk (Toad)
FMCA - F432054
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