Lexus RX450H Manual page 305

2-4. Using other driving systems

When luggage mode is selected
If the vehicle begins to move while still in luggage mode, the vehicle will
automatically change to "N" mode once speed exceeds 8 km/h (5 mph).
Even if vehicle speed is reduced below 8 km/h (5 mph), the vehicle height
will not automatically return to luggage mode.

Operating sound of the air suspension
When the vehicle height is lowered, such as when entering and loading the
vehicle, or when the height selector switch is operated, the sound of the
compressor operating or the mode changing may be heard. This does not
indicate a malfunction.

Automatic leveling function
Regardless of the number of occupants and the luggage load, vehicle height
in any mode is always adjusted to a fixed height by the automatic leveling
function.

Vehicle height mode change time

If the height control is operated continuously to lower the vehicle, the
suspension air tank may become full, causing operation of the vehicle
height lowering control to become slow.

To protect the compressor, the system will only raise the vehicle for a
total of 100 consecutive seconds. If it takes longer than this to reach the
selected height, operation may be suspended shortly and then restart.
However, it may not be possible to change the vehicle's height mode at
this time.

The electronically modulated air suspension will not operate when
The vehicle height control may not be able to change modes when the vehi-
cle runs over a high curb or other rugged surfaces where the suspension is
stretched.
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