Toyota Prius 2011 Manual page 211

Automatic light off system
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When the headlights are on: The headlights and tail lights turn off 30 sec-
onds after a door is opened and closed if the "POWER" switch has been
switched to ACCESSORY mode or OFF.
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When only the tail lights are on: The tail lights turn off automatically if the
"POWER" switch is switched to ACCESSORY mode or OFF and driver's
door is opened.
To turn the lights on again, turn the "POWER" switch to ON mode, or turn the
light switch off once and then back to the
Automatic headlight leveling system (vehicles with LED headlights)
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The level of the headlights is automatically adjusted according to the number
of passengers and the loading condition of the vehicle to ensure that the
headlights do not interfere with other road users.
If the indicator flashes... (vehicles with LED headlights)
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It may indicate a malfunction in the system. Contact your Toyota dealer.
Customization that can be configured at Toyota dealer
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Settings (e.g. light sensor sensitivity) can be changed. 
(Customizable featuresP. 596)
NOTICE
To prevent 12 volt battery discharge
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Do not leave the lights on longer than necessary if the hybrid system is not
operating.
2-3. Operating the lights and windshield wipers
or position.
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