2012 Lexus IS 250 User Guide - Page 223

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2-4. Using other driving systems

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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

appears to be directly in the vehicle’s line of travel.

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When an overhead billboard or other metallic structure appears to be in the

vehicle’s direct line of travel due to driving on a hill.

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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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When passing through certain toll gates

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When driving on a bridge.

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.

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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 automati-

cally disabled. In this case, the system will not activate even if there is a collision pos-

sibility.

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When there is a malfunction in the system

Warning lights and/or warning messages will turn on or flash. (

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P. 495, 504)