Lexus GS450h Owner's Manual page 263

Selecting conventional constant speed control mode
When constant speed control mode is selected, your vehicle will maintain
a set speed without controlling the vehicle-to-vehicle distance. Select this
mode only when vehicle-to-vehicle distance control mode does not func-
tion correctly due to dirt etc.
Press the "ON/OFF" button to
1
activate the cruise control.
Press the button again to deactivate
the cruise control.
Switch to constant speed control
2
mode.
(Push the lever forward and hold
for approximately 1 second.)
Cruise control indicator will come on.
When in constant speed control
mode, to return to vehicle-to-vehicle
distance control mode, push the lever
forward again and hold for approxi-
mately 1 second.
After the desired speed has been set,
it is not possible to return to vehicle-
to-vehicle distance control mode.
If the power switch is turned off and
then turned to ON mode again, the
vehicle will automatically return to
vehicle-to-vehicle distance control
mode.
Adjusting the speed setting:P. 257
Canceling and resuming the speed
setting: P. 260
GS450h_OM_OM30E26U_(U)
4-5. Using the driving support systems
263
4