Lexus LS 600h L 2012 Owner's Manual page 238

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 25 mph (40 km/h).
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Accelerating after setting the vehicle speed
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The vehicle can be accelerated normally. After acceleration, the set speed
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resumes.
Even without canceling the cruise control, the set speed can be increased by
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first accelerating the vehicle to the desired speed and then pushing the lever
down to set the new speed.
Automatic cruise control cancelation
■
Cruise control will stop maintaining the vehicle speed in any of the following situa-
tions.
Actual vehicle speed falls more than approximately 10 mph (16 km/h) below the
●
preset vehicle speed.
At this time, the memorized set speed is not retained.
Actual vehicle speed is below approximately 25 mph (40km/h).
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VSC is activated.
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If the cruise control indicator light flashes
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Press the "ON-OFF" button once to deactivate the system, and then press the but-
ton 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 vehicle inspected by your Lexus dealer.
2-4. Using other driving systems
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