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:
Throttle Body Disassembly/Reassembly
...
Setting the Clock
Clock
Models without navigation system
You can adjust the time in the clock display, using the CLOCK button with the
ignition switch in ACCESSORY or ON
.
Models without navigation system
Press ...
Drive Belt Inspection
Inspect the belt for cracks or damage. If the belt is cracked or damaged,
replace it.
Check that the position of the auto-tensioner indicator (A) is within the
standard range ( ...