Lexus LS460 2008 Owner's Manual page 216

2-4. Using other driving systems
The pre-collision system is operational when
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Pre-collision seat belt:
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• Vehicle speed is above 3 mph (5 km/h).
• The relative speed difference between your vehicle and another vehicle that
is forward of your vehicle, or the speed at your vehicle is approaching an
obstacle is greater than 18 mph (30 km/h).
• The front occupants are wearing a seat belt.
Pre-collision brake assist:
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• Vehicle speed is above 18 mph (30 km/h).
• The relative speed difference between your vehicle and another vehicle that
is forward of your vehicle, or the speed at your vehicle is approaching an
obstacle is greater than 18 mph (30 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. 630, 639)
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