1999 Lexus LS400 air conditioning

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Air flow selection

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(a) Climate control
SETTING OPERATION ± automatic control
21L003-3
1. Push the ºAUTOº button.
Air flow quantity, switching of the diffusers, on±off of the
air conditioning, and switching of the air intake between
RECIRCULATED AIR and OUTSIDE AIR are
automatically adjusted. The operation status is shown
by each indicator.
When one of the manual control buttons is depressed
while operating in automatic mode, the operation
corresponding to the button depressed is set. Other
conditions continue to be adjusted automatically.
Push the ºOFFº button to turn the air conditioning off.

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21L040±1

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2. Use the ºTEMPº or ºPASSENGER TEMPº button
to set the desired temperature.
The ºTEMPº or ºPASSENGER TEMPº button is used to
set the desired temperature. The temperature will be
controlled on the driver and passenger sides
simultaneously or individually.
ºTEMPº button ± Changes the temperature on the
driver
and passenger sides simultaneously or the driver
side only.
ºPASSENGER TEMPº button ± Changes the
temperature on the passenger side only.
ºDUALº button ± Changes the mode of the
temperature setting.
The indicator on the ºDUALº button has two modes:
 With the indicator on ± For individual temperature
setting
 With the indicator off ± For simultaneous
temperature setting

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21L005-2
Driver side setting
Passenger side setting
Mixed settingSETTING OPERATION ± manual control
If manual air flow selection is desired ±

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21L006-3
The outlets from which air is delivered can be selected
manually by pushing the button. The function of each
mode is as follows:
1Panel ± Air flows mainly from the instrument panel
vents.
2 Bi±level ± Air flows from both the floor vents and
the instrument panel vents.
3 Floor ± Air flows mainly from the floor vents.
4Floor/Windshield ± Air flows mainly from the floor
vents and windshield vents. If quick heating or cooling is desired ±
Push the ºTEMPº or ºPASSENGER TEMPº button on
either
side and hold it until ºMAX. HOTº or ºMAX. COLDº
appears on the display.
If manual fan speed control is desired ±

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21L007-3

1Fan speed at low 2Fan speed at high
The fan speed can be set to your desired speed by
pushing the appropriate side of fan speed control button.
The higher the fan speed is, the more air is delivered.
Pushing the ºOFFº button turns off the fan.
To remove exterior windshield frost, use the high speed
setting. If manual switching of air intake is desired ±

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21L008-4
Each time you push the air intake control button, the
mode changes in order from the RECIRCULATED AIR
mode to AUTOMATIC mode to OUTSIDE AIR mode,
then back to the RECIRCULATED AIR mode. Each
indicator light shows which mode is now selected.
1RECIRCULATED mode ± If quick circulation of
cooled air is desired, select this mode.
2AUTOMATIC mode ± When driving where the
outside air is dirty (i.e., when the vehicle running
just in front of your vehicle accelerates rapidly), the
system changes automatically from the OUTSIDE
AIR mode to the RECIRCULATED mode.
3OUTSIDE AIR mode ± The system will take fresh
outside air into the vehicle. For normal use, it is best to keep the air intake control
button set to OUTSIDE AIR mode. If recirculated air is
used
during heating, the windows will fog up more easily.
To change the sensitivity of the sensor switching
between the RECIRCULATED and OUTSIDE AIR in
the AUTOMATIC mode, push the air intake control
button until you hear a beep. The display changes
as illustrated below.
The sensitivity of the sensor can be adjusted only while
the vehicle has stopped.