There are several methods you can use to change the route destination.
MAF Sensor/IAT Sensor Replacement
Disconnect the MAF sensor/IAT sensor connector (A).
Remove the screws (B).
Remove the MAF sensor/IAT sensor (C).
Install the parts in the reverse order of removal ...
iPod®
...
Calculating the Route on the Destination Map
Calculate the route from the map of the destination address.
Select Calculate the Route.
► The system calculates and displays
the route line on the map screen.
“Display Destination Mapâ ...