Lexus IS F 2012 Owner's Manual page 186

2-4. Using other driving systems
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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Radar sensor and grille cover
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Always keep the sensor and grille cover clean to ensure that the vehicle-to-vehicle
distance control operates properly. (Some obstructions, such as snow, ice and plas-
tic objects, cannot be detected by the obstruction sensor.)
Dynamic radar cruise control is canceled if an obstruction is detected.
Warning lights, messages and buzzers for dynamic radar cruise control
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Warning lights, messages and buzzers are used to indicate a system malfunction or
to inform the driver of the need for caution while driving. (P. 473)
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Grille cover
Radar sensor