Lexus GS430 User Manual page 426

STARTING AND DRIVING
G31009
" 1 Multi−information display
2 Master warning light
3 "CRUISE" indicator light
4 Distance switch
(for changing vehicle−to−vehicle distance)
5 Cruise control switch
402
Changing the dynamic radar cruise control
mode
G31010
" 1 Vehicle−to−vehicle distance control mode
2 Conventional (fixed speed) cruise control mode
The dynamic radar cruise control function has two cruise
control modes.
D Vehicle−to−vehicle distance control mode for maintaining
an appropriate distance between vehicles
D Conventional (fixed speed) cruise control mode for cruising
at preset speeds
You can change the mode by using the control lever.
The two cruise control modes function differently. If you use
dynamic radar cruise control, always confirm which mode is
selected.