Lexus IS F 2012 Owner's Manual page 206

2-4. Using other driving systems
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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When passing through certain toll gates
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When driving on a bridge.
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When the system is activated in the situations described above there is also a possi-
bility that the seat belts will retract quickly and the brakes will be applied with a force
greater than normal. When the seat belt is locked in the retracted position, stop the
vehicle in a safe place, release the seat belt and refasten.
When there is a malfunction in the system
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Warning lights and/or warning messages will turn on or flash. (P. 463, 473)
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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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.
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