There is no default code, try the following.1. Look in glove box for small sticker with numbers, should be 5 digits with numbers no greater then 6.2. Pull out the ashtray and see if the sticker is on the back of there.(older models that have them)3. If you happen to have all the books from the dealer look in the 'HONDA SERVICE HISTORY' book, NOT the owners manual. It should be on the first page in the AUDIO CODE box.With the info you have you can call the dealer.