Ok so I picked up the LR3 to day with the unit installed. Works great for the backup camera and if my ipod cable actually would work, since its brand new, I'd have that working too. The unit is setup with AV1 being the backup cam, AV2 is for the ipod or anyother rca input I want to use and then AV3 is tucked away until I decide to put in a drop down or something. The backup cam works when I put it in Reverse and also I can turn it on anytime by pressing the left button under the nav screen. Pressing it a 2nd time brings up AV2's screen and again the nav. I can add the 3rd AV later to be able to press it again. The only problem there was, was the instructions for the install were for a Discovery 2 and we had to call to make sure they were the same for the LR3, which they were.
from you last post you said the left button under the nav screen. do you mean the factory buttons that display on/off road navigation. i assume that each time you press it, you change the input and eventually back to the nav?
do you have any pics of your rear camera?
Correct each time its pressed it goes to AV1(cam), AV2(ipod/etc), Nav....
They couldn't get the unit I wanted for the cam, so they drilled one above the license plate in the gray handle thing, lol. Pics tomorrow...