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:
Brake Hose Replacement
notice
Do not spill brake fluid on the vehicle; it may damage the paint. If
brake fluid gets on the paint, wash it off immediately with water.
NOTE:
Bef ...
Devices that Emit Radio Waves
The following products and systems on your vehicle emit radio waves when in
operation.
Each of the above complies with the appropriate requirements or the required
standards of FCC (Federal Commu ...
Regulator Valve Body Disassembly, Inspection, and Reassembly (A/T)
Clean all parts thoroughly in solvent, and dry them with compressed air.
Blow out all passages except the air check valve filter.
Inspect the regulator valve body for scoring and ...