Lexus IS 250C 2014 Manual page 225

Conditions that may trigger the system even if there is no possibility of collision
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When there is an object by the roadside at the entrance to a curve
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When passing an oncoming vehicle on a curve
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When driving over a narrow iron bridge
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When there is a metal object on the road surface
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When driving on an uneven road surface
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When passing an oncoming vehicle on a left-turn
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When your vehicle rapidly closes on the vehicle in front
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When a grade separation/interchange, sign, billboard, or other structure
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appears to be directly in the vehicle' s line of travel.
When an overhead billboard or other metallic structure appears to be in the
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vehicle' s direct line of travel due to driving on a hill.
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.
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.
When there is a malfunction in the system
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Warning lights and/or warning messages will turn on or flash. (P. 491, 500)
2-4. Using other driving systems
2
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