Toyota Lexusc Owner's Handbook Manual page 501

STARTING AND DRIVING
(a) Turning the system on
To operate conventional cruise control mode, press the
"ON-OFF" button. This turns the system on. The "CRUISE"
and "READY" indicator lights in the instrument cluster comes
on. Push the lever in the "MODE" direction for longer than 1
second to change to conventional cruise control mode. The
indicator in the instrument cluster is as shown. You can now
set your desired cruising speed. Pressing the "ON-OFF"
button again will turn the system completely off.
However, once the vehicle-to-vehicle distance control mode
activates and is used, it cannot be changed to the conventional
cruise control mode using the above operation. To change the
mode, press the "ON-OFF" button to turn the system off and
then press it again to turn it on. Next push the lever in the
"MODE" direction for longer than about 1 second.
To change to the vehicle-to-vehicle distance control mode
from the conventional cruise control mode, push the lever in
the "MODE" direction for longer than about 1 second.
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CAUTION
To avoid accidentally engaging cruise control, keep the
"ON-OFF" button off when not using dynamic laser
cruise control.