Speak to a Honda service rep if you no longer have the code sticker on the glove box. To make it easier for you if you have an older model vehicle; hold down the 1 and 6 radio preset buttons and hit the power on while holding them. The radio's serial number should show on the screen where the station numbers are usually shown. Take that to the rep to make it faster. If you have a newer model it should say to push and hold the power button for a few seconds to unlock the radio. If you have a radio other than the one that came with the car check it's user manual or call the maker of that radio for help.
Mr. Grant has it right
See your on sales rap or contact customer service
Open the glove box. In the glove box there should be a white sticker. On the sticker is your radio code
Call any Honda Dealership
Call them.
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