Toyota Lexusc Owner's Handbook Manual page 509

STARTING AND DRIVING
(b) Automatic leveling function
Regardless of the number of occupants or the luggage
load, vehicle height in any mode is always adjusted
automatically to a fixed height.
(c) Selecting "LO", "HI" or "N" mode
Selection conditions: To select the vehicle's height, it is
necessary to meet the following conditions.
"LO"
mode
At vehicle
Yes
stoppage
Under
Yes
approximately
30 km/h (19 mph)
Approximately
Yes
30 km/h (19 mph)
or over
490
D The engine is running.
D The height control "OFF" indicator light is off.
D The vehicle is within the speed limitations. Refer to the
following table.
Yes = The mode can be selected.
No = The mode cannot be selected.
"N" "HI"
mode mode
Yes Yes
Yes Yes
Yes No