Lexus LX 470 1998 Owner's Manual page 205

STARTING AND DRIVING
CAUTION
The "HI" (high) or "Extra high" mode should be used for
severe off−road driving condition only. Because the vehicle's
center of gravity is higher in this setting, the vehicle may
become unstable when turning abruptly, resulting in an
unexpected accident.
When the four−wheel drive control lever is put at "L", this mode may
change to the extra high mode automatically in accordance with the
driving condition.
When the vehicle exceeds the specified vehicle speed, the vehicle
height changes to the following:
With the four−wheel drive control lever at "H" and at the vehicle
speed of 30 km/h (19 mph) or over, the normal mode is
automatically selected.
With the four−wheel drive control lever at "L" and at the vehicle
speed of 50 km/h (30 mph) or over, the vehicle height becomes
automatically about 25 mm (1.0 in.) higher than the normal mode
height. If the vehicle speed is lowered about 20 km/h (12 mph) or
less after that, the high mode automatically resumes.
Extra high mode
This mode is automatically selected from the high mode with the
four−wheel drive control lever placed in "L" position depending
on the vehicle driving condition.
If the vehicle becomes stuck, the vehicle height rises automatically
to the extra high mode (slightly higher or at about 70 mm (2.8 in.)
higher than normal mode height).
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In the following cases, the extra high mode changes to the high mode
automatically:
D When your vehicle is no longer stuck.
D When the four−wheel drive control lever is put in a position other
than "L".
When you push the height select switch on the "B" side in the
extra high mode, the normal mode is selected.
Since the extra high mode is automatically selected, you cannot
select this mode on purpose with the height select switch.
D "N" (normal) mode
The vehicle height in this mode is standard.
This mode is suitable for ordinary driving.
D "LO" (low) mode
The vehicle height is about 50 mm (2.0 in.) lower at front and
about 40 mm (1.6 in.) lower at rear than the normal mode height.
This mode allows you easy access to the vehicle (getting in and out)
and easy loading and unloading operation.
This mode is available when the vehicle is stopped. When you start
the vehicle, the normal mode is automatically selected.