My unit will not find chicago, illinois

This is what I would try:

• Download and install Garmin Express on a computer

http://software.garmin.com/en-US/express...

• Connect your Nuvi to it. Make sure all updates have been downloaded and installed.

• Gamin may have a couple options where you were able to select which state maps were loaded on your system. If Illinois was not loaded, make sure it is.

• If there is no such option, there is another option in Garmin Express that lets you download a complete fresh updated copy of your maps.

Hopefully then you will be able to search the address you need.