Lexus GS450h Owner's Manual page 310

310
4-5. Using the driving support systems
Automatic cruise control cancelation
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Cruise control will stop maintaining the vehicle speed in any of the following situations.
Actual vehicle speed falls more than approximately 16 km/h (10 mph) below the preset
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vehicle speed.
At this time, the memorized set speed is not retained.
Actual vehicle speed is below approximately 40 km/h (25 mph).
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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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If the warning message for the cruise control is shown on the multi-information display
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Press the "ON/OFF" button once to deactivate the system, and then press the button
again to reactivate the system.
If the cruise control speed cannot be set or if the cruise control cancels immediately after
being activated, there may be a malfunction in the cruise control system. Have the vehi-
cle inspected by any authorized Lexus retailer or Lexus authorized repairer, or any reli-
able repairer.
WARNING
To avoid operating the cruise control by mistake
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Switch the cruise control off using the "ON/OFF" button when not in use.
Situations unsuitable for cruise control
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Do not use cruise control in any of the following situations.
Doing so may result in loss of control and could cause an accident resulting in death or
serious injury.
In heavy traffic
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On roads with sharp bends
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On winding roads
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On slippery roads, such as those covered with rain, ice or snow
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On steep hills
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Vehicle speed may exceed the set speed when driving down a steep hill.
When your vehicle is towing a trailer or during emergency towing
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