Depending on the length of time the power was interrupted, your system may require GPS initialization.

If initialization is not necessary, the system proceeds directly to the Startup Confirmation screen.
If the system fails to locate a sufficient number of satellites to locate your position within 10 minutes, the following screen is displayed.

If you are experiencing GPS reception problems:
Parking
Always use the parking brake when you park your vehicle. Make sure the parking
brake is set firmly, or your vehicle may roll if it is parked on an incline.
If your vehicle has an automatic transmis ...
Audio Control Display
Press the AUDIO button to display the audio system on the
navigation screen.
...
Power Windows
Turn the ignition switch to the ON (II) position to raise or lower any window.
To open the window, push the switch down and hold it. Release the switch when you
want to stop the window. To close ...