where is the navigator serial number?

The serial number is on the back of the unit under the passenger seat. It's not that easy to get to though. I usually have to use a flashlight and a mirror to get it. There are several numbers on the navigation unit and one of them will be the serial number.

You should be able to get this off of the information screen, is the screen operating properly?

its actually under the unit.you can see it with a mirror and a flashlight.call the dealer,give them the serial # and they will give you the unlock code.or it might be on a small card with your manuals or on a sticker in the c\glove box or on the first page of the maintenance manual.

it should be in the honda book in i guess your glove compartment.