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:
EVAP Canister Replacement
Raise the vehicle on a lift.
Except LX (A/T model): Remove the fuel tank cover (A)
LX (A/T model): Remove the floor under cover assembly (A).
Remo ...
Gauge Control Module Replacement
NOTE: Before replacing the gauge control module,
retrieve the ODO value and the maintenance minder information from
the gauge control module with the HDS.
Remove the instrument panel.
...
Radio Theft Protection
Your vehicle’s audio system will disable itself if it is disconnected from electrical
power for any reason.
To make it work again, you must enter a specific five-digit code in the preset
button ...