Lexus IS250 U Owner's Manual page 249

Obstacles not detected
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The sensor cannot detect plastic obstacles such as traffic cones. There may also be occa-
sions when the sensor cannot detect pedestrians, animals, bicycles, motorcycles, trees,
or snowdrifts.
Situations in which the pre-collision system does not function properly
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The system may not function effectively in situations such as the following:
On roads with sharp bends or uneven surfaces
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If a vehicle suddenly moves in front of your vehicle, such as at an intersection
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If a vehicle suddenly cuts in front of your vehicle, such as when overtaking
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In inclement weather such as heavy rain, fog, snow or sand storms
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If the vehicle is skidding when VSC is not operating
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When an extreme change in vehicle height occurs
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When only part of your vehicle' s front end collides with, or contacts, a vehicle or object
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in a frontal collision
When the radar sensor moves off position due to its surrounding area being subjected
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to a strong impact
Automatic cancelation of the pre-collision system
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When a malfunction occurs due to sensor contamination, etc. that results in the sensors
being unable to detect obstacles, the pre-collision system will be automatically disabled.
In this case, the system will not activate even if there is a collision possibility.
When there is a malfunction in the system
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The pre-collision system warning light will flash and warning messages will be displayed.
(P. 467, 476)
IS350/250_U (OM53C50U)
4-5. Using the driving support systems
249
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