How to Install Android Head Unit + Wireless Reverse Camera

[JonathanLondon]

For the reverse camera receiver you’ve just going to want to splice the red and black power and ground cables onto the small wiring loom that you’ve connected to the back of the had unit and you’re done! There is a blue cable marked “back” or something like that but you don’t need it. Just again tuck this out of the way somewhere.

Can I just check on the blue wire.

My understanding is that this is a input to the head unit.  It expects 12 volts when reverse gear is engaged, which forces the head unit to turn on, and select the reverse camera input.

I can see that the head unit might notice video arriving on the reverse camera input and select that, without the blue wire being necessary.  But does this happen if the head unit is turned off and you engage reverse?

Thanks
Jonathan.