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:
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 ...
Immobilizer System
The immobilizer system protects your vehicle from theft. If an improperly-coded
key (or other device) is used, the engine’s fuel system is disabled.
When you turn the ignition switch to the ON (I ...
Drive Belt Auto-Tensioner Inspection
Turn the ignition switch to ON (II), and make sure to turn the A/C switch
OFF, then turn the ignition switch to LOCK (0).
Check the position of the auto-tensioner indicator (A). S ...