Lexus 2003 LS Owner's Manual page 253

5. Release the parking brake and brake pedal. Depress
the accelerator pedal slowly for smooth starting.
In normal cruising, the vehicle will start in first gear and
automatically shift up to the most suitable gear. On inclines,
declines or winding roads, etc., the vehicle shifts up and down
automatically according to the running conditions to obtain the
suitable driving power and engine braking.
When the lever is in the "4" position, the automatic
transmission system will select the most suitable gear for the
running conditions such as hill climbing, hard towing, etc.
If you need to accelerate rapidly while driving, depress the
accelerator pedal to the full throttle position. This provides
more acceleration by automatically downshifting the
transmission to the next lower gear or beyond, depending on
the vehicle speed.
If engine braking is needed, such as in descending a long hill,
see "(b) Using engine braking".
STARTING AND DRIVING
(b) Using engine braking
31L132a
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.
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. If
you need to decrease the vehicle speed, see page 251.
2 Shift into the "3" position. The transmission will downshift
to third gear when the vehicle speed is or becomes lower
than 159 km/h (99 mph) and stronger engine braking will
be enabled.
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