A bit of cleaning before we sell it??? I think you can get the sat nav to reset by removing the battery, sure i saw something about it in the wiki. I was most amused when I got my Civic to find Spearmint Rhino in the sat nav favourites!
Well done, allan! I remember now- disconnecting the battery was something to do with clear the sat nav version so you could install older versions of the software. Why you'd want to do that is beyond me, unless you had a serious problem with a recent update.
The unlock code is initially set by the person who first puts the code in (you may have a glitch in the system!).
Subsequent changes to the code can only be done by confirming the current code followed by the new code.
If you don't know the originally entered code then you cannot access the system and you can only get it cancelled by the dealer.
PS: You would have to be in the 'Security' settings and said "Set Password" then spoke and was mis-heard by the girl in the glovebox. She repeated what she thought she heard but you would still have had to confirm "Yes" before the number was set. Sounds like you have a gremlin in there if you didn't do any of that.
This happened about 2 weeks after I bought the car last September and the Dealer reset it. On the off chance, thought one of you boffins may have sussed it out, to save me a 40 mile round trip.
Never mind, it's a Honda, - The Power Of Screams.