Toyota Prius 2011 Manual page 210

2-3. Operating the lights and windshield wipers
Turning on the high beam headlights
Daytime running light system (Canada only)
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To make your vehicle more visible to other drivers, the headlights turn on
automatically (at a reduced intensity) whenever the hybrid system is
started and the parking brake is released. Daytime running lights are not
designed for use at night.
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Compared to turning on the headlights, the daytime running light system
offers greater durability and consumes less electricity, so it can help
improve fuel economy.
Headlight control sensor (Canada only)
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210
With the headlights on, push
the lever forward to turn on the
high beams.
Pull the lever back to the center
position to turn the high beams
off.
Pull the lever toward you to
turn on the high beams.
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Release the lever to turn them off.
You can flash the high beams
with the headlights on or off.
The sensor may not function properly if
an object is placed on the sensor, or any-
thing that blocks the sensor is affixed to
the windshield. 
Doing so interferes with the sensor
detecting the level of ambient light and
may cause the automatic headlight con-
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trol system to malfunction.