There are several methods you can use to change the route destination.
Main Valve Body Disassembly, Inspection, and Reassembly (A/T)
Clean all parts thoroughly in solvent, and dry them with compressed air.
Blow out all passages.
Do not use a magnet to remove the check balls, it may magnetize the check
balls. ...
Sunvisor Removal/Installation
'9-10 models
Click here for an interactive version of this procedure.
NOTE:
Put on gloves to protect your hands.
Take care not to damage the sunvisor or the headliner.
...
During Route Guidance
During route guidance, route information is displayed on the map/guidance
screen.
Press the MAP/GUIDE button to display the guidance screen. ...