Toyota Lexusc Owner's Handbook Manual page 493

STARTING AND DRIVING
(e) Resetting to a faster speed
Push the lever up in the "+ RES" direction and hold it. The
displayed speed will increase in increments of 5 mph (for the
U.S.A.) or 5 km/h (for Canada). Release the lever when the
desired speed is attained. The vehicle speed will gradually
increase to the displayed speed.
However, a faster way to reset is to accelerate the vehicle and
then push the lever down in the "- SET" direction.
CAUTION
When the vehicle-to-vehicle distance control is on,
your cruising speed is regulated in proportion to the
speed of the vehicle ahead, so increasing the preset
speed using the control lever does not accelerate the
vehicle. However, if the vehicle ahead leaves the lane,
your cruising speed will increase to the preset speed
because the preset speed has been set higher using the
control lever. Confirm the setting on the display.
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(f) Resetting to a slower speed
Push the lever down in the "- SET" direction and hold it. The
displayed speed will decrease in increments of 5 mph (for
U.S.A.) or 5 km/h (for Canada). Release the lever when the
desired speed is attained. The vehicle speed will gradually
decrease to the displayed speed.
However, a faster way to reset is to depress the brake pedal
and then push the lever down in the "- SET" direction.
If the control lever is released when the vehicle speed exceeds
the upper limit of the preset speed traveling downhill while you
are pushing the lever down, the system will memorize the
upper limit of the preset speed as a preset speed.
With automatic transmission (standard type) —
Even if you downshift the transmission from "D" to "4" in the
vehicle-to-vehicle distance control mode, engine braking will
not be enabled because this mode is not cancelled.
decrease the vehicle speed, reset to a slower speed with the
cruise control lever or depress the brake pedal. If you use the
brake pedal, cruise control is cancelled.
To