Lexus IS 350C 2012 Manual page 233

CAUTION
Handling the radar sensor
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Observe the following to ensure the pre-collision 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 become inaccurate
or malfunction. If the sensor or surrounding area are subject to a strong impact,
always have the area inspected and adjusted by a Lexus dealer.
Do not disassemble the sensor.
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Do not attach accessories or stickers to the sensor, grille guard or surrounding
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area.
Do not modify or paint the sensor and grille.
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2-4. Using other driving systems
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