Toyota 2012 Prius Owner's Manual page 367

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Obstacles not detected
The sensor cannot detect plastic obstacles such as traffic cones. There may
also be occasions when the sensor cannot detect pedestrians, animals,
bicycles, motorcycles, trees, or snowdrifts.
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Situations in which the pre-collision 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 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
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.
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When there is a malfunction in the system
Warning lights and/or warning messages will turn on or flash. (→P. 536, 548)
PRIUS PHV_OM_OM47818U_(U)
2-4. Using other driving systems
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