Lexus IS300H 2017 Manual page 285

Temporary cancellation of functions
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When operation conditions are no longer met, a function may be temporarily canceled.
However, when the operation conditions are met again, operation of the function is auto-
matically restored. (P. 284)
Steering control function
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Depending on the vehicle speed, lane departure situation, road conditions, etc., the
driver may not feel the function is operating or the function may not operate at all.
Lane departure alert function
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The warning buzzer may be difficult to hear due to external noise, audio playback, etc.
Also, it may be difficult to feel steering wheel vibrations due to the road conditions, etc.
Hands off steering wheel alert
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Except for Israel: When the system determines that the driver has removed the hands
from the steering wheel while the steering control function is operating, a warning mes-
sage 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.
For Israel: When the system determines that the driver has removed the hands from the
steering wheel while the steering control function is operating, a warning message is dis-
played on the multi-information display and the buzzer sounds.
White (yellow) lines are only on one side of road
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The LDA system will not operate for the side on which white (yellow) lines could not be
recognized.
4-5. Using the driving support systems
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