Lexus IS 350C 2012 Manual page 229

The pre-collision system is operational when
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Pre-collision seat belt (type A)
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• Vehicle speed is above 4 mph (5 km/h).
• The speed at which your vehicle is approaching the obstacle or oncoming
vehicle exceeds 19 to 25 mph (30 to 40 km/h).
• The front occupants are wearing a seat belt.
Pre-collision seat belts (type B)
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• Vehicle speed exceeds 19 mph (30 km/h).
• The system detects sudden braking or skidding.
• The front occupants are wearing a seat belt.
Pre-collision brake Assist
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• Vehicle speed is above 19 mph (30 km/h).
• The speed at which your vehicle is approaching the obstacle or the vehicle is
greater than 19 to 25 mph (30 to 40 km/h).
• The brake pedal is depressed.
Pre-collision braking:
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• The pre-collision braking function is activated.
• Vehicle speed is above 10 mph (1 5 km/h).
• The relative speed difference between your vehicle and another vehicle that
is forward of your vehicle, or the speed at which your vehicle is approaching
an obstacle is greater than 10 mph (1 5 km/h).
Situations in which the pre-collision system does not function properly
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The system may not function effectively in situations such as the following:
On roads with sharp bends or uneven surfaces
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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
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In inclement weather such as heavy rain, fog, snow or sand storms
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When your vehicle is skidding with the VSC system off
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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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2-4. Using other driving systems
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