2010 Lexus IS 250 Owners Manual - Page 295

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2-4. Using other driving systems

2

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The pre-collision system is operational when

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Pre-collision seat belt (linked to the radar sensor)

°

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-collision seat belts (linked to brake operation)

°

Vehicle speed exceeds 18 mph (30 km/h).

°

The system detects sudden braking or skidding.

°

The front occupants are wearing a seat belt.

●

Pre-collision brake Assist

°

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.

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Situations in which the pre-collision system does not function properly

The system may not function effectively in situations such as the following:

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On roads with sharp bends or uneven surfaces

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On slippery roads such as those covered with ice or snow

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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

●

In inclement weather such as heavy rain, fog, snow or sand storms

●

When your vehicle is skidding with the VSC system off

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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