Honda 2009 Pilot Owner's Manual page 515

Except Touring models
If your vehicle's battery is
disconnected, or goes dead, the time
setting will be reset to 1:00. To set
the time again, follow the setting
procedure (see page 312 ).
On Touring models
The navigation system will also
disable itself. The next time you turn
on the ignition switch, the system
will require you to enter a PIN
before it can be used. Refer to the
navigation system manual.
Checking the Battery
509