Toyota Lexusc Owner's Handbook Manual page 491

STARTING AND DRIVING
(b) Turning the system on
To operate dynamic laser cruise control, press the "ON-OFF"
button. This turns the system on. When the "CRUISE" and
"READY" indicator lights in the instrument cluster come on, you
can now set your desired
vehicle-to-vehicle distance. Pressing the "ON-OFF" button
again will turn the system completely off.
When the ignition is turned off, the system is also automatically
turned off. To use dynamic laser cruise control again, press the
"ON-OFF" button again to turn it on.
When the ignition is turned off, all the preset data is cleared.
When you use the dynamic laser cruise control again, you
need to reset the data.
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To avoid accidentally engaging the cruise control, keep
the "ON-OFF" button off when not using the dynamic
laser cruise control.
(c) Setting the desired speed
cruising speed and
The transmission must be in "D" before you set the cruise
control speed.
CAUTION