2013 Civic "Premium Audio System" Navigation Stereo Upgrade

[webby]

My 2012 civic ex has nav radio only and no amplifier. I'm guessing that premium refers to radios with amp.

That is correct. So your wiring diagram would be this:
https://9thcivic.com/forum/threads/...uts-for-factory-radio.5916/page-6#post-418712

I see your unit claims to come with a steering wheel control harness, but the reviews on Amazon say it doesn’t work (unless that’s your review).

opened up the steering column and see bunch of wires off 3 diff connectors (air bag, cruise control, audio controls). ANY ONE know which wire may be bcan-l and bcan-h at steering column?

I don’t know if @Janz3n has the ability to see the wiring at the steering wheel?

I probably should ask to make sure, but are you in the US, because wiring is different based on country.