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:
Voice Help
This navigation system comes with voice help information, which tells you how
to use the voice command functions.
Go to Voice Info for tips when using the voice command functions. ...
Tailgate Handle Replacement
NOTE:
Put on gloves to protect your hands.
Take care not to scratch the tailgate or the related parts.
Remove these items:
Tailgate lower trim panel
...
Dashboard/Steering Hanger Beam Disassembly/Reassembly (Page-1)
Special Tools Required
KTC Trim Tool Set SOJATP2014
*Available through the Honda Tool and Equipment Program; call 888-424-6857
NOTE:
Put on gloves to protect your hands.
...