I just recently got an android head unit for my 2011 Fit GP1. I've got it plugged in and working, however I'm struggling to find some information on how to connect it to some of the extra interior features that aren't available in the installation videos, which tend to be GE/GG models to my knowledge.

1. Steering wheel controls - The main steering wheel controls for channel, volume and audio are connected automatically via the wiring harness. There's a loose wire in the back of the radio for the second set of SWC keys that handle handsfree calling, however I've got no idea which plug in the original radio connects to them. Does anybody know of a wiring diagram or pinout which will have this information in it?

2. Integrated backup camera - The radio I bought includes a camera, however my Fit already has one connected to the factory radio which I'd prefer to use to avoid having to remove it and run wires for the new camera all the way through the car. I'm not sure how the stock camera connects to the original radio, but it's definitely not the way the aftermarket ones do it by tapping into one of the reverse lights to detect when the car is reversing. Is there any information available on how the existing camera can be accessed and connected to a new radio?

Thanks in advance.