Try looking inside the glove box and there should be a sticker with the serial number and a 5 to 6 digit number. That 5 to 6 digit number is the unlock code. If you cant find it call Honda give them the serial number located on the back of the radio itself, and they should be able to give you the code. Acually getting the serial number may require you to pull on the about the whole dash, but its cheaper than having to pay for it.