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google.com . . . .  or look in google 'groups' to find the answer
already explained.

'Curly'

Bruce Johnson <bjrea@earthlink.net> wrote in rec.autos.makers.honda:

Huh?  The codes are required for sound system components installed in
vehicles.  It's for your protection.  If anyone steals the components,
theyy care useless to them unless they have the code.  Once the unit is
disconnected from the battery, it requires a code to be enetered in
order for it to function.  It's a good thing, and Hinda allows you to
register your vehicle on the its web site and put your code there in
case you happen to misplaced the card that comes with coded systems.

The anti-thieft components blink with a red light to alert thieves that
they aren't of any use to them if they steal it.  They move on to
something else.  After I had my pull-out stereo stolen when I didn't
pull it out for just a five minute stop, I relaized the brilliance of
these systems.  On the down side, my trainer bought a used truck with a
coded system, and after he had an accident, he couldn't use it because
the previous owner didn't transfer the ifnormation.  His insurance
covered the replacement of the stereo, thank goodness, but that's the
breaks.  If you want security, that's the way to go.

Show the receipt indicating you own the unit to any dealer and they'll provide
you the code.