Originally Posted by BirchyBoy
Do you have a bundle of wires hanging down under the dashboard? There should be a microphone and also an additional USB connector.
I hope you resolved your issue. I don’t know that I’m much help, not knowing if I have the same Sony radio unit. I’ve had two different Sony units with CarPlay. One in a 2019 Minnie and one in my 2022 Winnebago class A which we presently own. . The CarPlay and microphone did not work because it wasn’t plugged in properly. I took it in twice, the dealer was no help, told me the unit was bad and they would order a new one. I’m handy , so I removed the dash bezel ,got the radio model and figured out the wiring diagram. The microphone was unplugged, which was an easy fix. There was a USB plug going into radio for the CarPlay port that was loose.
My Sony has different ports/plugs for the cameras and the phone input. It sounds like it’s not wired properly, but if your servicing dealer is clueless, maybe contacting Winnebago directly can get a dealer to help. Good luck.