If your camera leads aren't long enough then you need to make them longer by adding more wire. The red wire should go a switchable power source (one that turns on with acc/on). I tapped mine into the red wire on the harness.
I still needed to tap into pin 6 & 16 to get the signal from the steering wheel. The 3.5 is used to get that signal into the head unit to make the function work.
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