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:
Sunvisor Removal/Installation
'9-10 models
Click here for an interactive version of this procedure.
NOTE:
Put on gloves to protect your hands.
Take care not to damage the sunvisor or the headliner.
...
Driving
This chapter discusses driving, refueling, and information on items such as
accessories. ...
Secondary Shaft Disassembly, Inspection, and Reassembly (A/T)
Inspect the thrust needle bearings and the needle bearings for galling
and rough movement.
Inspect the splines for excessive wear and damage.
Check the shaft bearing s ...