Honda 2010 Accord Sedan Owner's Manual page 73

Turn Signals and Headlights
EX-L and EX-L V6
AUTO − The automatic lighting
feature turns on the headlights and
all other exterior lights, when it
senses low ambient light.
To turn on automatic lighting, turn
the light switch to AUTO. The lights
will come on automatically when the
outside light level becomes low (at
dusk, for example). The lights on
indicator comes on as a reminder.
The lights and indicator will turn off
automatically when the system
senses high ambient light.
The lights will remain on when you
turn off the ignition switch. They will
turn off automatically when you
remove the key and open the driver's
door. To turn them on again, either
turn the ignition switch to the ON
(II) position or turn the light switch
to the position.
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Even with the automatic lighting
feature turned on, we recommend
that you turn on the lights manually
when driving at night or in a dense
fog, or when you enter dark areas
such as long tunnels or parking
facilities.
Do not leave the light switch in
AUTO if you will not be driving the
vehicle for an extended period (a
week or more). You should also turn
off the lights if you plan to leave the
engine idling or off for a long time.
2010 Accord Sedan
LIGHT SENSOR
The automatic lighting feature is
controlled by a sensor located on top
of the dashboard. Do not cover this
sensor or spill liquids on it.