Lexus 2013 IS250 Owner's Manual page 280

278
4-5. Using the driving support systems

The pre-crash safety system is operational when
The PCS OFF switch is not pressed and the following conditions are met:

Pre-crash warning:
• Vehicle speed is greater than about 15 km/h (10 mph).
• The speed at which your vehicle is approaching the obstacle or the vehicle
running ahead of you is greater than about 15 km/h (10 mph).

Pre-crash brake assist:
• The VSC OFF switch is not pressed.
• Vehicle speed is greater than about 30 km/h (19 mph).
• The speed at which your vehicle is approaching the obstacle or the vehicle
running ahead of you is greater than about 30 km/h (19 mph).
• The brake pedal is depressed.

Pre-crash braking:
• The VSC OFF switch is not pressed.
• Vehicle speed is greater than about 15 km/h (10 mph).
• The speed at which your vehicle is approaching the obstacle or the vehicle
running ahead of you is greater than about 15 km/h (10 mph).

Conditions that may trigger the system even if there is no danger of a collision

When there is an object by the roadside at the entrance to a curve

When passing an oncoming vehicle on a curve

When driving over a narrow iron bridge

When there is a metal object on the road surface

When driving on an uneven road surface

When passing an oncoming vehicle on a left-turn (left-hand drive vehicles) or
right-turn (right-hand drive vehicles)

When your vehicle rapidly closes on the vehicle in front

When a grade separation/interchange, sign, billboard, or other structure appears
to be 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

When climbing a steep hill causes an overhead billboard or other metallic struc-
ture to appear directly in the vehicle's line of travel

When driving under an overpass

When an extreme change in vehicle height occurs

When passing through certain toll gates

When passing through a tunnel

When the radar sensor moves off position due to its surrounding area being sub-
jected 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.
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