Thanks for the update. Couple questions though. Did you install a rear camera as well? If so, are you able to view it even when not in reverse? I know the head unit has an allocated button for it but wanted to know if it's only functional in reverse.
My truck has the factory rear camera - which shows in a small screen in the rearview mirror when I put it into reverse.
At the moment - that setup is still working. What happens when I put the truck into reverse is that I get the cam view of the rear camera in the rearview mirror still - and - the Pioneer gets triggered that the truck is in reverse and shows up the backing "lineup" lines on the screen - but I get no visual.
I remember reading somewhere that the video feed for the rearview camera can be accessed behind the kick panel on the passenger side front footwell. So I think what I need to do - is get in there and extend the video feed over to the Pioneer - and then it will work.
I have a longer term plan though. I want to add a "trailer cam" -which will be a high mounted camera so I can watch any loads I'm carrying when I'm towing a trailer. I think what I want to do is surface that thru the video screen that's embedded into the rearview mirror. Then I'll surface the backup cam on the Pioneer screen - and I also want to add a front facing camera too - and surface that on the Pioneer screen.
That's the next phase of the project - for now I think I'm just going to leave the factory camera feeding the rearview mirror.