Toyota Lexusc Owner's Handbook Manual page 482

4 Resetting to a slower speed
Press the control lever downward in the "- SET" direction and
hold it. Release the lever when the desired speed is attained.
While the lever is held downward, the vehicle speed will
gradually decrease.
When the difference between the actual vehicle speed and the
set speed is less than 5 km/h (3 mph), the set speed can be
lowered 1.6 km/h (1 mph) each time by pressing the control
lever downward in the "- SET" direction quickly.
However, a quicker way to reset is to depress the brake pedal
and then press the control lever downward in the "- SET"
direction.
Vehicle with automatic transmission (standard type) —
Even if you downshift the transmission from the "D" position to
"4" with the cruise control on, engine braking will not be
enabled because the cruise control is not cancelled. To
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.
Vehicle with automatic transmission (multi-mode type) —
Even if you downshift the transmission from the "D" or "5" (fifth
range) to the "4" (fourth range) with the cruise control on,
engine braking will not be enabled because the cruise control
is not cancelled. To 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.
STARTING AND DRIVING
5 Resuming the preset speed
If the preset speed is cancelled by pulling the control lever or
by depressing the brake pedal, pushing the lever up in the
"+ RES" direction will restore the speed set prior to
cancellation. However, once the vehicle speed falls below
about 40 km/h (25 mph), the preset speed will not be resumed.
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