Toyota Lexusc Owner's Handbook Manual page 459

STARTING AND DRIVING
(b) Using engine braking
To use the braking power of the engine, downshift the
transmission in the way described below:
1 Shift into the "4" position. The transmission will downshift
to fourth gear and engine braking will be enabled.
Vehicle with the cruise control —
When the cruise control is being used, even if you
downshift from "D" to "4", engine braking will not be
enabled because the cruise control is not cancelled. For
vehicle speed reduction, see page 463.
440
Vehicle 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" to "4", engine braking will not be
enabled because the cruise control is not cancelled. For
vehicle speed reduction, see pages 474 and 484.
2 Shift into the "3" position. The transmission will downshift
to third gear when the vehicle speed is or becomes lower
than 129 km/h (81 mph) and stronger engine braking will
be enabled.
3 Shift into the "2" position. The transmission will downshift
to second gear when the vehicle speed is or becomes
lower than 83 km/h (52 mph) and more powerful engine
braking than that of "3" position will be enabled.
4 Shift into the "L" position. The transmission will downshift
to first gear when the vehicle speed is or becomes lower
than 39 km/h (24 mph) and maximum engine braking will
be enabled.
mode or in the