Toyota land cruiser prado Owner's Manual page 173

However, when you are driving on bumpy
roads, which may cause the suspension to
fully elongate, the rear height control air
suspension will not operate.
164
(c) Vehicle height adjustment
To change the mode, push the height
select switch on either side of "Y"
(higher) or "B" (lower).
The height control indicator light indicates
which mode is selected. (See "(e) Height
control indicator lights" described below.)
Selecting the "HI" mode—
Push the height select switch on the "Y"
side when the vehicle speed is under
about 30 km/h (19 mph).
To change the "N" mode to "HI", push
the switch once.
To change the "LO" mode to "HI", push
the switch twice. It takes about 30 sec-
onds until the "LO" mode changes to the
"HI" mode.
Selecting the "N" mode—
To change the "HI" mode to "N", push
the height select switch on the "B" side
once.
If the underbody of the vehicle has
touched the surface on bumpy roads, the
vehicle height cannot be lowered with the
height select switch.
To change the "LO" mode to "N", push
the height select switch on the "Y" side
once.
Selecting the "LO" mode—
Push the height select switch on the "B"
side while the vehicle is stopped.
To change the "N" mode to "LO", push
the switch once.
To change the "HI" mode to "LO", push
the switch twice.
If the underbody of the vehicle has
touched the surface on bumpy roads, the
vehicle height cannot be lowered with the
height select switch.