I have been researching how to upgrade the visual quality of the rear camera on our 2013, and have confirmed with an engineer friend that's working on autonomous cars (by showing him the wiring diagram) that yes, these cameras are 6 volts for some reason. The rest of the connectivity is pretty basic though - there's a ground and the +6 volts, and then a composite video + and -. 4 connections total.
I did find someone is making an adapter harness that I believe sits between the head unit of other Toyota and Subaru (BRZ?) vehicles that both supplies 12v down the wire going to the camera, and then also facilitates connecting aftermarket cameras for use with the OEM head unit (assuming these are primarily used for cars with only a single, rear-facing camera, and those where a camera was an option.)
Does anyone have diagrams of the wiring/harnessses/connectors going to the rear of our head units?
The other option might be simply grabbing +12v from somewhere else on the rear of the car... But truth be told I'd like to modify exactly 0 actual harnesses inside the hatch if possible.
One more comment re: the 'lines' (which btw I find mostly useless): I'm pretty certain the lines themselves are overlaid onto the video display by the parking assist ECU; the camera itself doesn't have anything to do with the lines.
Here's a link to the wiring diagram showing all the connectivity on a 2013:
http://www.revbase.com/BBBMotor/Wd/DownloadPdf?id=998719
... so if you really want that, I wonder if you can replace your 2011's parking-ECU brain (assuming it has one - I haven't yet checked that site above to see what the differences are) with a newer unit. Stranger things have happened. Years ago I tinkered with replacing the TCU on my E55 to try and allow for a complete disabling of traction control, and the car didn't explode.
