The back of my unit had holes for both of the factory antenna wires. Left side (close to the steering wheel), towards the bottom. No idea if they work as I haven't used the radio since I got the LX, all sound through CarPlay.
For routing the wire:
For backup cam wiring, using their camera—the wire for mine routes behind the glovebox, then drops underneath through the floor grommet on the RHS and is zip-tied to the rear AC lines. I have additional wires running through that location, so it made sense for mine. I also have rear drawers installed and would almost rather have a root canal than take those out, so an interior run was out of the question.
Before you assume that will work for you: tape or tie the wire down loosely, and check for length. My camera is mounted on a dual-swingout bumper, very far to the right side. I have a little bit of length to spare, but not enough to mount the camera in the stock license plate location.
View attachment 3030295
It covers the TA in UTAH. Far from optimal location, but it's the best I could do.
Electrical connections:
I found a few references in other forums that you might could skip the yellow wire, since the "active" state should just read off the CANBUS anyway. I chose to just wire it as the diagram specified. There are a few inputs on the back of the head unit—you want the one labeled "CAMERA". IDK why, but others online reference the other input (four letters, something like CRMT?) as providing crap quality if you use it.
Teyes diagram:
TEYES CC3 - https://cc3.teyes.ru/en/map.html
On the head unit side, you have to tap into G3 and G5. On my harness, that's the red and brown on the power connector.
View attachment 3030298
Ignore the third tap in the middle, that's me fixing a screwup with what I had on hand.
At the rear (I don't have pictures of that, sorry), I ran two wires from the factory reverse light. One power, one ground—you just have to get enough length to match up with your camera location. If you plan to mount near the factory location, then you won't need additional wiring.
Power goes to the yellow wire attached to the RCA video cable supplied. Ground goes to the black on the power wires supplied. And for whatever reason, the reds get connected together.
So far (one whole day lol), it's working well. Apologies for taking so long to get it done and get back to you, just a way busier week than I'd hoped for.