Toyota Land Cruiser Prado Owner's Manual page 292

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Situations in which the pre-crash safety system does not function
properly
The system may not function effectively in situations such as the following:
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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 inter-
section
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If a vehicle suddenly cuts in front of your vehicle, such as when overtak-
ing
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In inclement weather such as heavy rain, fog, snow or sand storms
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When your vehicle is skidding with the VSC system off
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When an extreme change in vehicle height occurs
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When the axis of the radar is out of adjustment
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Automatic cancelation of Pre-crash safety system
When a malfunction occurs due to sensor contaminations, etc. that results in
the sensors being unable to detect obstacles, the pre-crash safety system
will be automatically disabled. In this case, the system will not activate even
if there is a collision possibility.
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Obstacles not detected
The sensor cannot detect plastic obstacles such as traffic cones. There may
also be occasions when the radar sensor cannot detect pedestrians, ani-
mals, bicycles, motorcycles, trees, or snowdrifts.
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When there is a malfunction in the system
Warning lights and/or warning messages will turn on or flash. (→P. 553)
2-4. Using other driving systems
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