Lexus 2003 LS Owner's Manual page 267

The dynamic laser cruise control function has 2 cruise control
modes: vehicle–to–vehicle distance control mode for
maintaining an appropriate distance between vehicles, and a
conventional (fixed speed) cruise control mode for cruising at
preset speeds.
CAUTION
Always drive carefully and attentively when using either
cruise control mode. Read and understand the Owner's
Manual thoroughly before using the cruise control. To
avoid serious injury or death, do not rely on to prevent
accidents or to control the vehicle's speed in
emergency situations. Do not use cruise control except
in appropriate road and traffic conditions.
STARTING AND DRIVING
Changing the dynamic laser cruise control
mode
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1 Vehicle–to–vehicle distance control mode
2 Conventional (fixed speed) cruise control mode
When you push the main switch, the vehicle–to–vehicle
distance mode is activated. To change to the conventional
(fixed speed) cruise control mode, push the lever in the
"MODE" direction for longer than about 1 second.
However, once the vehicle–to–vehicle distance control mode
activates and is used, it cannot be changed to the conventional
(fixed speed) cruise control mode using the above operation.
To change the mode, turn the main switch off and then on. Next
push the lever in the "MODE" direction for longer than about 1
second.
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