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:
Horn Test/Replacement
'09-11 models
Remove the front grille cover.
Disconnect the 1P connector (A) from the horn (B).
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Front Seat-Back Cover/Pad Replacement (Part - 2)
Release airbag attachment wire A and airbag attachment wire B from the
seat-back frame (C).
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Tire Pressure Sensor Replacement (USA models)
Removal
notice
Each tire pressure sensor contains a lithium anode battery that is
not removable. The complete tire pressure sensor should be disposed of
according t ...