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:
Drive Belt Inspection
Inspect the belt for cracks or damage. If the belt is cracked or damaged,
replace it.
Check that the position of the auto-tensioner indicator (A) is within the
standard range ( ...
Wiper/Washer Switch Test/Replacement
Remove the steering column covers.
Disconnect the dashboard wire harness 8P connector (A) from the wiper/washer
switch (B).
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Audio Control Display
Press the AUDIO button to display the audio system on the
navigation screen.
...