Lexus IS 350C 2012 Manual page 207

Dynamic radar 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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(vehicles with an automatic transmission)
Vehicle speed is above approximately 30 mph (50 km/h).
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Accelerating after setting the vehicle speed
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The vehicle can accelerate normally. After acceleration, the set speed resumes.
However, during vehicle-to-vehicle distance control mode, the vehicle speed may
decrease below the set speed in order to maintain the distance to the vehicle
ahead.
Automatic cancelation of vehicle-to-vehicle distance control
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Vehicle-to-vehicle distance control driving is automatically canceled in the follow-
ing situations:
Actual vehicle speed falls below approximately 25 mph (40 km/h).
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VSC is activated.
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The sensor cannot operate correctly because it is covered in some way.
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The windshield wipers are operating at high speed (when the wiper switch is set
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to the "AUTO" mode or the high speed wiper operation position).
When snow mode is set.
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If vehicle-to-vehicle distance control driving is automatically canceled for any other
reason, there may be a malfunction in the system. Contact your Lexus dealer.
Automatic cancelation of constant speed control
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The cruise control will stop maintaining the vehicle speed in the following situations:
Actual vehicle speed is more than approximately 10 mph (16 km/h) below the
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set vehicle speed.
At this time, the memorized set speed is not retained.
Vehicle speed falls below approximately 25 mph (40 km/h).
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VSC is activated.
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2-4. Using other driving systems
Adjusting the speed setting:
P. 201
Canceling and resuming the speed
setting: P. 203
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