Lexus IS300H 2017 Manual page 234

234
4-2. Driving procedures
Turn signals can be operated when
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The power switch is in ON mode.
If the indicator flashes faster than usual
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Check that a light bulb in the front or rear turn signal lights has not burned out.
If the turn signals stop flashing before a lane change has been performed
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Operate the lever again.
Customization
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The number of times the turn signals flash during a lane change can be changed.
(Customizable feature P. 657)