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:
Dashboard Vent Removal/Installation
Side Vent
Click here for an interactive version of this procedure (driver's,
passenger's).
NOTE: Take care not to scratch the dashboard or its related parts.
Pull the upper portion ( ...
Navigation—Changing Route or Destination
You can alter your route by adding waypoints to visit, adding streets to
avoid, or changing your destination during route guidance. ...
Servo Body Disassembly, Inspection, and Reassembly (A/T)
Clean all parts thoroughly in solvent, and dry them with compressed air.
Blow out all passages.
Inspect the servo body for scoring and damage.
Check all valves for fre ...