Lexus IS250 U Owner's Manual page 248

248
4-5. Using the driving support systems
The pre-collision system is operational when
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The PCS OFF switch is not pressed and the following conditions are met:
Pre-collision warning:
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• Vehicle speed is greater than about 10 mph (15 km/h).
• The speed at which your vehicle is approaching the obstacle or the vehicle running
ahead of you is greater than about 10 mph (15 km/h).
Pre-collision brake assist:
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• The VSC OFF switch is not pressed.
• Vehicle speed is greater than about 19 mph (30 km/h).
• The speed at which your vehicle is approaching the obstacle or the vehicle running
ahead of you is greater than about 19 mph (30 km/h).
• The brake pedal is depressed.
Pre-collision braking:
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• The VSC OFF switch is not pressed.
• Vehicle speed is greater than about 10 mph (15 km/h).
• The speed at which your vehicle is approaching the obstacle or the vehicle running
ahead of you is greater than about 10 mph (15 km/h).
Suspension control (vehicles with Adaptive Variable Suspension System):
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• Vehicle speed is greater than about 4 mph (5 km/h).
• The speed at which your vehicle is approaching the obstacle or the vehicle running
ahead of you is greater than about 19 mph (30 km/h).
Conditions that may trigger the system even if there is no danger of a 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
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directly in the vehicle' s line of travel
When there is a metal plate in the road in front of the vehicle on a downhill slope
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When climbing a steep hill causes an overhead billboard or other metallic structure to
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appear directly in the vehicle' s line of travel
When driving under an overpass
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When an extreme change in vehicle height occurs
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When passing through certain toll gates
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When passing through a tunnel
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When the radar sensor moves off position due to its surrounding area being subjected
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to a strong impact
When the system is activated in the situations described above, there is also a possibility
that the brakes will be applied with a force greater than normal.
IS350/250_U (OM53C50U)