Lexus 2003 LS Owner's Manual page 265

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 slip indicator light blinks and a warning tone sounds, the
preset speed will be automatically cancelled.
If the preset speed automatically cancels out for other than
these reasons, do not operate the cruise control. Although it
is no problem to continue driving, have your vehicle checked
by your Lexus dealer at the earliest opportunity.
3 Resetting to a faster speed
Press the control lever upward in the "RES/ACC" 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/ACC" direction quickly within 0.6
seconds.
However, a quicker way to reset is to accelerate the vehicle
and then press the control lever downward in the
"SET/COAST" direction.
STARTING AND DRIVING
4 Resetting to a slower speed
Press the control lever downward in the "SET/COAST"
direction and hold it. Release the lever when the desired
speed is attained. While the lever is held downward, the
vehicle speed will gradually decrease.
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
lowered 1.6 km/h (1 mph) each time by pressing the control
lever downward in the "SET/COAST" direction quickly within
0.6 seconds.
However, a quicker way to reset is to depress the brake pedal
and then press the control lever downward in the
"SET/COAST" direction.
Even if you downshift the transmission from the "D" position to
"4" with the cruise control on, engine braking will not be applied
because the cruise control is not cancelled. To decrease the
vehicle speed, reset to a slower speed with the cruise control
lever or depress the brake pedal. If you use the brake pedal,
cruise control is cancelled.
5 Resuming the preset speed
If the preset speed is cancelled by pulling the control lever, by
depressing the brake pedal or vehicle skid control activation,
pushing the lever up in the "RES/ACC" direction will restore the
speed set prior to cancellation. However, once the vehicle
speed falls below about 40 km/h (25 mph), the preset speed
will not be resumed.
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