Lexus GS450h Owner's Manual page 305

Dynamic radar cruise control with full-speed range can be set when
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The shift lever is in D or range 4 or higher of S has been selected.
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Range 4 or higher of D has been selected by using the paddle shift switch.
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Vehicle speed is above approximately 50 km/h (30 mph).
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However, when a preceding vehicle is detected, the dynamic radar cruise control with
full-speed range can be set even if the vehicle speed is at or below approximately
50 km/h (30 mph).
Accelerating after setting the vehicle speed
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The vehicle can accelerate by operating the accelerator pedal. After accelerating, the
set speed resumes. However, during vehicle-to-vehicle distance control mode, the vehi-
cle speed may decrease below the set speed in order to maintain the distance to the pre-
ceding vehicle.
Automatic cancelation of vehicle-to-vehicle distance control mode
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Vehicle-to-vehicle distance control mode is automatically canceled in the following situ-
ations.
Actual vehicle speed falls below approximately 40 km/h (25 mph) when there are no
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vehicles ahead.
The preceding vehicle leaves the lane when your vehicle is following at a vehicle speed
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below approximately 40 km/h (25 mph). Otherwise, the sensor can not properly
detect the vehicle.
VSC is activated.
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TRC is activated for a period of time.
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When the VSC or TRC system is turned off by pressing the VSC OFF switch.
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When snow mode is set.
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The sensor cannot detect correctly because it is covered in some way.
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Pre-crash braking is activated.
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The parking brake is operated.
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The vehicle is stopped by system control on a steep incline.
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The following are detected when the vehicle has been stopped by system control:
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• The driver is not wearing a seat belt.
• The driver's door is opened.
• The vehicle has been stopped for about 3 minutes
If vehicle-to-vehicle distance control mode is automatically canceled for any other rea-
son, there may be a malfunction in the system. Contact any authorized Lexus retailer or
Lexus authorized repairer, or any reliable repairer.
GS450h_300h_OM_OM30F92E_(EE)
4-5. Using the driving support systems
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