1/ Check the owners manual, there should be a card with the code for the radio there. Make sure to keep it.

2/ If you don't have that, your best bet is Honda, they can get it for you from the serial number.

3/ Code for each car is different, you can not count on the code being the same for each each.

When you get it, make sure to save it somewhere and to share it with a new owner if you sell the car. You will need it every time the battery is disconnected (Anti-theft feature)

Hope this helps.

A