If for whatever reason the anti-theft radio got reset and need the code and you don't have the code ,,try this procedure ,, it works on ACCORDS 2001-2202 ex, it might work on other years as well ,, you can try it
Once you ge the serial #, call the dealer and they should be able to give you the radio code , You might have to show proof of ownership....


Displaying the Anti-Theft
Radio Serial Number

On 01-02 Accord EXs, follow these steps if you need to display
the anti-theft radio serial number:
1. Turn on the radio, and turn the ignition switch
to ON (II). The display must read COdE to get
the serial number.

2. Turn off the radio.

3. Press and hold the #1 and #6 radio preset
buttons, then turn on the radio. The radio will
display a U and four digits (for example,
U1004); these are the first four digits of the
serial number. Then the radio will display an L
and four digits (for example L8564); these are
the last four digits of the serial number. Record
all eight digits, then go to step 4.

4. Once you get the serial # , call the dealer and get the code


5. Enter the anti-theft code into the radio.