Lexus RX 450h 2010 Owner's Manual page 236

CAUTION
Conditions under which the vehicle-to-vehicle distance control may not function
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correctly
Apply the brakes as necessary in the following conditions as the radar sensor may
not be able to correctly detect vehicles ahead, and an accident may result:
When water or snow thrown up by the surrounding vehicles hinders the function-
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ing of the radar sensor
When your vehicle is pointing upwards (caused by a heavy load in the luggage
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compartment etc.)
When the road curves or when the lanes are narrow
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When steering wheel operation or your position in the lane is unstable
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When the vehicle ahead of you decelerates suddenly
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To ensure the radar sensor functions correctly
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Do not do the following to the sensor or grille as doing so may cause the sensor not
to function correctly and could result in an accident:
Sticking or attaching anything to them
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Leaving them dirty
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Disassembling or subjecting them to strong shocks
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Modifying or painting them
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Replacing them with non-genuine parts
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Handling the radar sensor
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Observe the following to ensure the cruise control system can function effectively:
Keep the sensor and front grille clean at all times.
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Clean the sensor and front grille with a soft cloth so you do not mark or damage
them.
Do not subject the sensor or surrounding area to a strong impact.
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If the sensor moves even slightly off position, the system may malfunction. If the
sensor or surrounding area is subject to a strong impact, always have the area
inspected and adjusted by your Lexus dealer.
Do not disassemble the sensor.
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Do not attach accessories or stickers to the sensor, grille or surrounding area.
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Do not modify or paint the sensor and grille.
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2-4. Using other driving systems
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