Lexus 2003 LS Owner's Manual page 290

STARTING AND DRIVING
Normal mode: Suitable for driving on roads with a normal
surface.
High mode: Suitable for driving on rough roads which are
unsurfaced or continually bumpy.
The damping effect is set slightly firmer in the high mode. So
you may feel the vibration of the vehicle compared to in the
normal mode. However, this does not mean a malfunction in
the system. We recommend you use a normal mode in normal
driving.
To change the mode, push the selector switch.
Normal mode:
The vehicle height remains at normal height at all driving
speeds.
High mode:
The vehicle height switches between the following two vehicle
heights according to the driving conditions:
Vehicle height Driving condition
Normal Medium and high speed driving
High Low speed driving
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The indicator light shows the high mode is selected.
NOTICE
For vehicles equipped with the height control switch, be
sure to turn the ignition switch off before jacking. If this
is not done, the vehicle height adjustment function will
operate, which may cause body damage.
Malfunction warning
If the system is malfunctioning, "HEIGHT HI" appears on the
multi–information display, the master warning light comes on
and a warning tone sounds. Have the system checked by your
Lexus dealer at the first opportunity.