I'm just posting this as information for anyone else that might need it, because I couldn't find any mention of it in all the searches I did here. I recently bought my 2002 TL-S and wanted to reset the PIN for the personal address feature in the navigation, but couldn't find any information on how to go about that. I called a couple Acura dealers here, and they wanted to charge an hour labor to reset it. Well I discovered on my own that if you go into diagnostic mode, and then clear the RAM, it resets the PIN number. Then if you go into setup, then "Other", then "Personal Pin", instead of asking you to enter the old PIN, as it did before, it asks you to enter the new PIN. And that's it.

A lot better than $125!