Automatically Cancelling Constant Speed Control; Vehicle-To-Vehicle Distance Settings; Radar Sensor And Grille Cover - Lexus IS250 2009 Service Manual

2-4. Using other driving systems

Automatically cancelling constant speed control

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The set speed is automatically canceled in the following situations.
Actual vehicle speed is more than 10 mph (16 km/h) below the preset vehicle
l
speed
At this time, the memorized set speed is not retained.
Vehicle speed falls below 25 mph (40 km/h)
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VSC is activated
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Vehicle-to-vehicle distance settings

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Select a distance from the table below. Note that the distances shown correspond
to a vehicle speed of 50 mph (80 km/h). Vehicle-to-vehicle distance increases/
decreases in accordance with vehicle speed.
Distance options
Medium

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 or plastic
objects, cannot be detected by the obstruction sensor.)
Dynamic radar cruise control is canceled if an obstruction is detected.
176
Long
Short
Vehicle-to-vehicle distance
Approximately 210 ft. (65 m)
Approximately 150 ft. (45 m)
Approximately 100 ft. (30 m)
Grille cover
Radar sensor