Call you Honda dealer for code - I see to recall you need a code from the radio or owners manual. They give you a 5 or 6 digit code that resets your radio. Keep the code - you'll need it every time the battery is dead or disconnected.
I have Honda Odyssey radio and stereo it says on Audio power off asking for the code when I put code it’s not accepted I press 1-6 and press 2 comes on 3 minutes and goes back off is anybody know ?