The Pre-Collision System Is Operational When - Lexus IS250 2009 Service Manual

The pre-collision system is operational when

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Pre-crash seat belt (linked to the radar sensor)
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• Vehicle speed is above 3 mph (5 km/h).
• The speed at which your vehicle is approaching the obstacle or oncoming
vehicle exceeds 18 to 24 mph (30 to 40 km/h).
• The front occupants are wearing a seat belt.
Pre-crash seat belts (linked to brake operation)
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• Vehicle speed exceeds 18 mph (30 km/h).
• The system detects sudden braking or skidding.
• The front occupants are wearing a seat belt.
Pre-crash brake Assist
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• Vehicle speed is above 18 mph (30 km/h).
• The speed at which your vehicle is approaching the obstacle or the vehicle is
greater than 18 to 24 mph (30 to 40 km/h).
• The brake pedal is depressed.
Conditions that may trigger the system even if there is no danger 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 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. 383, 392)
2-4. Using other driving systems
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