Lexus 2004 LS430 Owner's Manual page 378

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
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The indicator light shows the high mode is selected.
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 an accident.
Malfunction warning
If the system is malfunctioning, "Height Hi" appears on the
multi-information display, the master warning light comes on
Low speed driving
and a warning tone sounds. Although it is no problem to
continue driving, have the system checked by your Lexus
dealer at the first opportunity.
31L336
CAUTION