Lexus CT200h Owner's Manual page 271

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 vehicle, such as at an intersection
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If a vehicle suddenly cuts in front of 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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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 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 automati-
cally disabled. In this case, the system will not activate even if there is a collision pos-
sibility.
CT200h_U (OM76040U)
2-4. Using other driving systems
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