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 Passenger's Tray Lid Removal/Installation
NOTE: Take care not to scratch the dashboard or its related parts.
Open the lid.
Remove the screws, then remove the passenger's upper tray lid (A).
...
Controls
This chapter explains how to operate the various controls necessary for
driving. ...
Torque Converter Housing Selector Control Shaft Oil Seal Replacement (A/T)
Special Tools Required
Driver Handle, 15 x 135L 07749-0010000
Oil Seal Driver Attachment 07947-ZV00100
Remove the oil seal from the torque converter housing.
Install the n ...