I'm not sure how the accord and the TSX navi system differs, but here are a couple of thoughts/ideas

Check out the first picture here: http://tsx.acurazine.com/forums/show...=backup+camera

And check out post #16 and # 17 here (ie: using the navitodvd converter to connect a device to your navi): http://tsx.acurazine.com/forums/show...2A+camera+navi

I also remember someone stating that the TSX navi has a port or pin or something for the backup camera, but I don't remember if it was confirmed