Hi
I do not have a Honda navigation system, and cannot think of what it may look like
I guess it's a 2 din as per the way I changed the radio on our si
I think the simplest way would be see if you have an AVIN option on the screen display
I also think most would be RCA connections, and a good tip (came from TG) if you have a rear cam input, you most likely would have a lead called back at the back of the 2 din, which you connect the command wire to, so it auto switches to rear camera on reverse gear selector
You are correct, power to the rear camera is usually from the reverse light
There are a few posts on the forum for changing radio
I'm sorry if I'm wrong and good luck
Many thanks
John