Lexus IS 250C 2014 Manual page 192

2-4. Using other driving systems
Cruise control can be set when
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The shift lever is in the D or range 4 or higher of S has been selected.
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Range 4 or higher has been selected by using the paddle shift.
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Vehicle speed is above approximately 25 mph (40 km/h).
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Accelerating after setting the vehicle speed
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The vehicle can be accelerated normally. After acceleration, the set speed
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resumes.
Even without canceling the cruise control, the set speed can be increased by
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first accelerating the vehicle to the desired speed and then pushing the lever
down to set the new speed.
Automatic cruise control cancelation
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Cruise control will stop maintaining the vehicle speed in any of the following situa-
tions.
Actual vehicle speed falls more than approximately 10 mph (16 km/h) below the
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preset vehicle speed.
At this time, the memorized set speed is not retained.
Actual vehicle speed is below approximately 25 mph (40 km/h).
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VSC is activated.
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If the cruise control indicator light flashes
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Press the "ON-OFF" button once to deactivate the system, and then press the but-
ton again to reactivate the system.
If the cruise control speed cannot be set or if the cruise control cancels immediately
after being activated, there may be a malfunction in the cruise control system. Have
the vehicle inspected by your Lexus dealer.
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