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:
Map, Voice, Entering Destinations
...
CD Player
If a disc error occurs, you may see the following error messages.
...
Fuel and Emissions System Description - Catalytic Converter System
Catalytic Converter System
Warm Up Three Way Catalytic Converter (WU-TWC) and
Under-floor Three Way Catalytic Converter (Under-floor TWC)
The WU-TWC and the under-flo ...