Toyota Lexusc Owner's Handbook Manual page 481

STARTING AND DRIVING
(b) Setting operation
" Each function is described below.
1 Setting at a desired speed.
The transmission must be in the "D" position or the shift range
position must be "4" (fourth range) or "5" (fifth range) in "S"
mode (with multi-mode type) before you set the cruise control
speed.
Bring the vehicle to the desired speed, press the control lever
downward in the "- SET" direction and release it. This sets the
vehicle at that speed. Now you may take your foot off the
accelerator pedal. If you need acceleration — for example,
when passing — depress the accelerator pedal enough for the
vehicle to exceed the set speed. When you release the
accelerator pedal, the vehicle will return to the speed set prior
to the acceleration.
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2 Cancelling the preset speed
You can cancel the preset speed by either of the following:
a. Pulling the control lever in the "CANCEL" direction.
b. Depressing the brake pedal.
If the vehicle speed falls below about 40 km/h (25 mph), the
preset speed will be automatically cancelled.
If the vehicle speed drops 16 km/h (10 mph) below the preset
speed, the preset speed will also automatically be cancelled.
If the preset speed automatically cancels for reasons other
than the above, there is no problem to continue driving.
However, please contact your Lexus dealer.
3 Resetting to a faster speed
Press the control lever upward in the "+ RES" direction and
hold it. Release the lever when the desired speed is attained.
While the lever is held upward, the vehicle will gradually gain
speed.
When the difference between the actual vehicle speed and the
set speed is less than 5 km/h (3 mph), the set speed can be
increased 1.6 km/h (1 mph) each time by pressing the control
lever upward in the "+ RES" direction quickly.
However, a quicker way to reset is to accelerate the vehicle and
then press the control lever downward in the "- SET" direction.