urn your ignition off to begin retrieving your radio code. Press and hold the "1" and "6" preset buttons on your radio. Turn your ignition on. Write down the code displayed on your radio. The display will flash with two numbers: one beginning with a "U" and one beginning with a "L." Write down both numbers (beginning with the "U" number), and then disregard the "U" and the "L." This number (eight digits) is your radio serial code. You'll need it to retrieve your radio anti-theft code. Contact Honda to retrieve your radio anti-theft code. You'll need your 17-digit VIN...Vehicle Identification Number, found beneath the driver's side of the windshield and your radio serial code. Honda's customer service number is (800) 999-1009. Provide the representative with the information to acquire your radio anti-theft code. You can also retrieve your radio anti-theft code online at https://radio-navicode.Honda.com/
then turn your ignition to "Acc" or "On" to power on your radio. Enter your radio anti-theft code using the preset buttons at the bottom of your radio. For example, if your anti-theft code is "55512," you would press the "5" button three times, then the "1" button, then the "2" button. This will unlock and reset your Honda radio.
you can try the above for your 2000..if you get two 4 numbers have someone write them down. then go to the web site above. you'll need the VIN too.
Unfortunately most of the time, owners of 2000 and older Honda vehicles need to physically remove the radio from the dashboard by using some automotive pry bar tools and locate the serial number sticker on the back of the unit.).
hope this helps a little