Lexus RC350 Owner's Manual page 247

Cruise control can be set when
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The shift lever is in D.
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Range 4 or higher of D has been selected by using the paddle shift.
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Vehicle speed is above approximately 25 mph (40 km/h).
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Accelerating after setting the vehicle speed
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The vehicle can be accelerated by operating accelerator pedal. After accelerating, the
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set speed resumes.
Even without canceling the cruise control, the set speed can be increased by first accel-
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erating the vehicle to the desired speed and then pushing the lever down to set the new
speed.
Automatic cruise control cancelation
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Cruise control is automatically canceled in any of the following situations.
Actual vehicle speed falls more than approximately 10 mph (16 km/h) below the set
●
speed.
Actual vehicle speed is below approximately 25 mph (40 km/h).
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VSC is activated.
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TRAC is activated for a period of time.
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When the VSC or TRAC 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 your Lexus dealer.
4-5. Using the driving support systems
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