Lexus GS430 User Manual page 435

STARTING AND DRIVING
When the engine switch is turned off, the system is also
automatically turned off. To use the dynamic radar cruise
control again, push the "ON−OFF" button again to turn it on.
CAUTION
To avoid accidentally engaging cruise control , keep the
"ON−OFF" button off when not using dynamic radar
cruise control.
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(b) Setting operation
g31002
"Each function is described below.
1 Setting the desired speed
The transmission must be in "D", "6" (sixth range), "5" (fifth
range) or "4" (fourth range) before you set the cruise control
speed in the conventional cruise control mode of the dynamic
radar cruise control.
After bringing 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 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.