Lexus ES 350 Owner's Manual page 162

2-4. Using other driving systems
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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Vehicle speed is above approximately 30 mph (50 km/h).
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Switching modes
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The mode cannot be switched to constant speed control mode if vehicle-to-vehicle
distance control mode has been used. The mode also cannot be switched from con-
stant speed control to vehicle-to-vehicle distance control mode. Turn the system off
be pressing the "ON-OFF" button, and turn it on again.
Accelerating
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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 following
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.
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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 10 mph (16 km/h) below the preset vehicle
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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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