You want to view the backup camera on your Axxera AV614BH while listening to music or whatever, just push the mode button for more then two seconds.
The unit will automatically select camera mode when the reverse gear is selected.
To enable camera mode at any other time, press and hold MODE on the
faceplate for more than two seconds.
Press and hold MODE for more than two seconds to go back to the previous
It works I tried it.
Thanks to aa9zz for getting us the manual with this info in it. See post 12 in the following link to download the manual.