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:
Changing a Flat Tire
If a tire goes flat while driving, grasp the steering wheel firmly, and brake
gradually
to reduce speed. Then, stop in a safe place. Replace the flat tire with a
compact
spare tire. Go to a deal ...
ODS Unit Replacement
Removal
Do the battery terminal disconnection procedure,
then wait at least 3 minutes before starting work.
Disconnect the passenger's side airbag harness 2P connector. ...
Reporting Safety Defects
In the U.S.
If you believe that your vehicle has a defect which could cause a crash or
could cause injury or death, you
should immediately inform the National Highway Traffic Safety Administration ...