Toyota Lexusc Owner's Handbook Manual page 470

(c) Using engine braking
" "S" mode position
To use the braking power of the engine, downshift the range in
the "S" mode position as follows:
D Shift into the "4" (fourth range) position. The transmission
will downshift to fourth gear and engine braking will be
engaged.
If you drive in the "D" position: Shift the selector lever to
the "S" position and "4" (fourth range) will automatically be
selected.
If you drive in the "S" position: Shift the selector lever
down to the "-" position by selecting the "4" (fourth range).
STARTING AND DRIVING
Vehicles with the cruise control —
When the cruise control is being used, even if you downshift
from "D" or "5" (fifth range) to "4" (fourth range), engine
braking will not be enabled because the cruise control is not
cancelled. For vehicle speed reduction, see page 463.
Vehicles with the dynamic laser cruise control —
When the cruise control is being used in the conventional
(fixed speed) cruise control
vehicle-to-vehicle distance control mode, even if you
downshift from "D" or "5" (fifth range) to "4" (fourth range),
engine braking will not be enabled because the cruise
control is not cancelled. For vehicle speed reduction, see
page 484, 474.
D Shift into the "3" (third range) position. The transmission will
downshift to third gear when the vehicle speed is or
becomes lower than 129 km/h (81 mph) and more powerful
engine braking will be enabled.
If you drive in the "D" position: Shift the selector lever to
the "S" position then shift the lever down to the "-" position
once to select the "3" (third range).
If you drive in the "S" position: Shift the selector lever
down to the "-" position to select "3" (third range).
mode or in the
451