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:
Driveshaft Removal
Special Tools Required
Ball Joint Remover, 28 mm 07MAC-SL0A202
Ball Joint Thread Protector, 14 mm 071AF-S3VA000
Raise and support the vehicle.
Remove the front wheel.
...
Customer Service Information
Honda dealership personnel are trained professionals.
They should be able to answer all your questions. If you encounter a problem
that
your dealership does not solve to your satisfaction, pleas ...
Receiver/Dryer Desiccant Replacement (With A/C)
NOTE: Install the receiver/dryer as quickly as possible to prevent the system
from absorbing moisture from the air.
Remove the A/C condenser.
Remove the bolts from the A/C cond ...