Lexus 2003 LS Owner's Manual page 286

STARTING AND DRIVING
CAUTION
To avoid accidentally engaging cruise control , keep the
main switch off when not using dynamic laser cruise
control.
272
Setting operation
31L167c

Each function is described below.
1
Setting the desired speed
The transmission must be in "D" or "4" before you set the cruise
control speed in the conventional cruise control mode of the
dynamic laser cruise control.
After bringing the vehicle to the desired speed, press the
control lever downward in the "SET/COAST" direction and
release it. This sets the vehicle at that speed and the
multi–information display shows the preset speed. At this time,
you may take your foot off the accelerator pedal. If you need
to accelerate – for example, when passing – depress the
accelerator pedal enough for the vehicle to exceed the preset
speed. When you release the accelerator pedal, the vehicle
will return to the speed set prior to acceleration.