IADutch

That worked, thanks.

Explain a little more please.

I added a backup camera recently. Multimeter shows connection to backup light has power. Plugged into Rearview camera in on the head unit. Problem: won't show the rear view when car is in reverse. After much searching, I found a box in the online manual that says to go into the settings and turn camera view on. When I try that, the settings button is gray. Only the AV and Audio buttons are colored. What do I do to get the settings button active? Thanks.