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:
Flywheel Replacement
Install the ring gear holder.
Loosen the flywheel mounting bolts in a crisscross pattern in several
steps. Remove the bolts, then remove the flywheel and the ring gear holder. ...
How to Set Readiness Codes
Malfunction Indicator Lamp (MIL) Indication (In relation to Readiness
Codes)
The vehicle has certain readiness codes that are part of the on-board
diagnostics for the emissions systems. If the ve ...
System Controls
...