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:
TPMS (Tire Pressure Monitoring System)
U.S. models only
Monitors the tire pressure while you are
driving. If your vehicle’s tire pressure becomes
significantly low, the low tire pressure
indicator comes on.
Conditions such as low ...
Tires
To safely operate your vehicle, your tires must be the proper type and size,
in good condition with adequate tread, and correctly inflated.
The following pages give more detailed information on how ...
Horn Test/Replacement
'09-11 models
Remove the front grille cover.
Disconnect the 1P connector (A) from the horn (B).
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"Honda_SymbolMark ...