The rear view always on is an internal setting on both the three way box and the radio.
You'll see in past posts many axxera folk had to set theirs up to do what yours is doing.
I don't precisely remember the setting on the three way box but it's a switch or a cable position designating the default camera.
Post 695 in my signature thread has all the secret Eonon settings to accomplish what you want to do.
I had to collect those from many places but I'm sure someone on the net has a list like this for almost any radio on the market.
Camera delay and screen choice is likely a standard setting on any modern radio head but it might be a few layers deep.
And
I'm about to pull my radio head out entirely and give it away.
Local radio has no value to us.
Thousands of stations broadcsst over the web.
Our head unit is used solely for apps and maps, no radio.
We're going to use the double din spot as a cubby and use a 10 inch android tablet.(which can be used in the stick house as a live radar display...or a tablet.)
In this day and age a radio head has almost zero value except to hear local advertisements.
We get far better cell coverage than we ever get local radio coverage.
Local radio, typewriter, 3 year old paper map, cassette music tapes, noaa...not entirely useless but not a first choice.
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