Lexus LS460 2011 Owner's Manual page 256

2-4. Using other driving systems

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 16 km/h (10 mph)
below the set vehicle speed.
At this time, the memorized set speed is not retained.

Actual vehicle speed falls below approximately 40 km/h (25 mph).

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 plastic 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 mal-
function or to inform the driver of the need for caution while driving. (P.
687, 696)
240
LS460_EE
Grille cover
Radar sensor