Toyota HILUX Owner's Manual page 172

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Headlight control sensor (if equipped)
The sensor may not function properly if an
object is placed on the sensor, or anything
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 sys-
tem to malfunction.
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Light reminder buzzer
A buzzer sounds when the key is removed and the driver's door is opened
while the lights are turned on.
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Customization that can be configured by your Toyota dealer (vehicles
with headlight control sensor)
Setting of the light sensor sensitivity can be changed.
NOTICE
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To prevent battery discharge
Do not leave the lights on longer than necessary when the engine is not
running.
4-3. Operating the lights and wipers
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