Lexus GS450h Owner's Manual page 289

Hands off steering wheel alert
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For Israel: When the system determines that the driver has removed the hands from the
steering wheel while the steering assist function or lane centering function is operating, a
warning message is displayed on the multi-information display and the buzzer sounds.
Except for Israel: When the system determines that the driver has removed the hands
from the steering wheel while the steering assist function or lane centering function is
operating, a warning message is displayed on the multi-information display.
If the driver continues to keep the hands off of the steering wheel, the buzzer sounds, a
warning message is displayed and the function is temporarily canceled. This alert also
operates in the same way when the vehicle is driven with the steering wheel lightly
gripped. However, depending on the road conditions, etc., the function may not cancel.
White (yellow) lines are only on one side of road
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The LKA system will not operate for the side on which white (yellow) lines could not be
recognized.
Conditions in which functions may not operate properly
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In the following situations, the camera sensor may not detect white (yellow) lines and var-
ious functions may not operate normally.
There are shadows on the road that run parallel with, or cover, the white (yellow) lines.
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The vehicle is driven in an area without white (yellow) lines, such as in front of a tollgate
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or checkpoint, or at an intersection, etc.
The white (yellow) lines are cracked, "Raised pavement marker" or stones are present.
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The white (yellow) lines cannot be seen or are difficult to see due to sand, etc.
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The vehicle is driven on a road surface that is wet due to rain, puddles, etc.
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The traffic lines are yellow (which may be more difficult to recognize than lines that are
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white).
The white (yellow) lines cross over a curb, etc.
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The vehicle is driven on a bright surface, such as concrete.
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The vehicle is driven on a surface that is bright due to reflected light, etc.
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The vehicle is driven in an area where the brightness changes suddenly, such as at the
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entrances and exits of tunnels, etc.
Light from the headlights of an oncoming vehicle, the sun, etc. enters the camera.
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The vehicle is driven where the road diverges, merges, etc.
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The vehicle is driven on a slope.
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GS450h_300h_OM_OM30F92E_(EE)
4-5. Using the driving support systems
289
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