Lexus GS430 User Manual page 432

STARTING AND DRIVING
The multi−information display will return to the
vehicle−to−vehicle distance screen about 6 seconds after the
vehicle−to−vehicle distance screen has been changed to
another screen.
CAUTION
To avoid accidentally engaging the cruise control, keep
the "ON−OFF" button off when not using the dynamic
radar cruise control.
408
(c) Setting operation
G31014
"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.