Lexus IS300H 2017 Manual page 303

Automatic cancelation of constant speed control mode
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Constant speed control mode is automatically canceled in the following situations:
Actual vehicle speed is more than approximately 16 km/h (10 mph) below the set vehi-
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cle speed.
Actual vehicle speed falls 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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Pre-collision braking is activated.
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If constant speed control mode is automatically canceled for any other reason, there may
be a malfunction in the system. Contact any authorized Lexus retailer or Lexus autho-
rized repairer, or any reliable repairer.
Warning messages and buzzers for dynamic radar cruise control
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Warning messages and buzzers are used to indicate a system malfunction or to inform
the driver of the need for caution while driving. If a warning message is shown on the
multi-information display, read the message and follow the instructions.
When the sensor may not be correctly detecting the vehicle ahead
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In the case of the following and depending on the conditions, operate the brake pedal
when deceleration of the system is insufficient or operate the accelerator pedal when
acceleration is required.
As the sensor may not be able to correctly detect these types of vehicles, the approach
warning (P. 300) may not be activated.
Vehicles that cut in suddenly
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Vehicles traveling at low speeds
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Vehicles that are not moving in the same lane
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Vehicles with small rear ends (trailers with no load on board, etc.)
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Motorcycles traveling in the same lane
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When water or snow thrown up by the surrounding vehicles hinders the detecting of
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the sensor
4-5. Using the driving support systems
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