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:
Troubleshooting
Why does the vehicle position icon on the map “lag” a
short distance behind my actual position, especially at
intersections?
This is normal. The navigation system is unaware of the
width o ...
Radio Commands
Radio*
Radio on
Radio off
Radio select FM1
Radio select FM2
Radio select AM
Radio tune to # FM (#: frequency,
e.g., 95.5)
Radio tune to # AM (#: frequency,
e.g., 1020)
Radio seek up
Radio s ...
Coolant Replacement
Wait until the engine is cool, then carefully remove the radiator cap.
Remove the splash shield.
Loosen the drain plug (A), and drain the coolant.
Rem ...