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:
MTF Inspection and Replacement (M/T)
Park the vehicle on level ground, and turn the engine off.
Raise the vehicle on a lift, and make sure it is securely supported.
Remove the splash shield.
...
Bluetooth® HandsFreeLink®
This section describes how to operate Bluetooth® HandsFreeLink®. You
can place and receive phone calls using your vehicle’s audio system
without handling your cell phone.
PHONE button
Select ...
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.
...