Lexus GS430 User Manual page 390

STARTING AND DRIVING
(c) Using engine braking
G31027
" "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 "5" (fifth range) position. The transmission will
downshift to fifth gear and engine braking will be enabled.
If you drive in the "D" position: Shift the selector lever to
the "S" position and "5" (fifth range) will automatically be
selected.
If you drive in the "S" position: Shift the selector lever
down to the "–" position by selecting the "5" (fifth range).
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When the cruise control is being used, even if you downshift
from "D" or "6" (sixth range) to "5" (fifth range), engine
braking will not be enabled because the cruise control is not
cancelled. For vehicle speed reduction, see page 400.
Vehicles with the dynamic radar 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 "6" (sixth range) to "5" (fifth range),
engine braking will not be enabled because the cruise
control is not cancelled. For vehicle speed reduction, see
pages 423 and 411.
D Shift into the "4" (fourth range) position. The transmission
will downshift to fourth gear when the vehicle speed is or
becomes lower than the speed listed below and more
powerful engine braking will be enabled.
GS430 193 km/h (120 mph)
GS300 (2WD) 187 km/h
GS300 (4WD) 178 km/h
If you drive in the "D" position: Shift the selector lever to
the "S" position and shift the lever down to the "–" position
once to select "4" (fourth range). However, when you move
the lever to the "S" position while the AI shifting control is
operating, the first shift range will be "5" (fifth range), "4"
(fourth range) or "3" (third range) because the suitable shift
range is selected depending on the driving condition.
If you drive in the "S" position: Shift the selector lever
down to the "–" position to select the "4" (fourth range).
mode or in the
(116 mph)
(111 mph)