Lexus RX 450h 2012 Owner's Manual page 252

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Automatic cancelation of constant speed control
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
set vehicle speed.
At this time, the memorized set speed is not retained.
Vehicle speed falls below approximately 25 mph (40 km/h).
VSC is activated.
Radar sensor and grille cover
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
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. 614)
2-4. Using other driving systems
Grille cover
Radar sensor
2
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