Lexus RX 450h 2010 Owner's Manual page 204

STEP 2
Daytime running light system
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To make your vehicle more visible to other drivers, the daytime running lights
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turn on automatically whenever the hybrid system is started and the parking
brake is released. Daytime running lights are not designed for use at night.
For the U.S.A.: Daytime running lights can be turned off by operating the switch.
Compared to turning on the headlights, the daytime running light system offers
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greater durability and consumes less electricity, so it can help improve fuel
economy.
Headlight control sensor
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2-3. Operating the lights and windshield wipers
Press the "ENTER" switch to
change to "OFF".
The "AFS OFF" indicator will be
displayed.
Each pressing of the switch turns
"AFS" on and off.
Press the menu switch to change
to the normal display.
The sensor may not function properly if an
object is placed on the sensor, or anything
that blocks the sensor is affixed to the wind-
shield.
Doing so interferes with the sensor detecting
the level of ambient light and may cause the
automatic headlight system to malfunction.
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