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:
A/C System Charging (With A/C)
caution
Air conditioning refrigerant or lubricant vapor can irritate your
eyes, nose, or throat.
Be careful when connecting service equipment.
...
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.
...
Rear Door Latch Replacement
NOTE:
Put on gloves to protect your hands.
Take care not to scratch the door or related parts.
Raise the glass fully.
Remove the door panel.
Disco ...