Lexus SC 430 2004 Manual page 228

Turning the system on
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To operate the cruise control, push the main switch. This turns
the system on. The indicator light in the instrument cluster
shows that you can now set your desired cruising speed.
Another push on the switch will turn the system completely off.
When the ignition switch is turned off, the main switch is also
automatically turned off. To use the cruise control again, push
the main switch again to turn it on.
CAUTION
To avoid accidental cruise control engagement, keep
the main switch off when not using the cruise control.
STARTING AND DRIVING
Setting operation
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" Each function is described below.
1 Setting at a desired speed.
The transmission must be in "D" or "4" before you set the cruise
control speed.
Bring 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. 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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