1999 Lexus LS400 audio

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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.

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21L044
When you push either side of the ºTEMPº button several
times, the sensitivity changes from º+3º down to º±3º. If
you do not operate any button for a few seconds, the
previous display returns. If manual on±off of the air conditioning is desired ±
Push
the ºA/Cº button to turn the air conditioning on and
push it again to turn the air conditioning off.
The air conditioning does not work if the outside
temperature is lowered down to around 0 C (32F).
If the system is used for ventilation, heating in dry
weather or removing frost or exterior fog on the
windshield, turn the air conditioning off once it is no
longer required. This will improve fuel economy. The air
conditioning can be used for year±round automatic
temperature control including cooling and dehumidifying
operation.
If the air conditioning compressor does not operate, the
indicator of the ºA/Cº button will blink. If the indicator of
the ºA/Cº button blinks even when the ºA/Cº button is
pushed again, have the compressor checked by your
nearest Lexus dealer.

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(b) Windshield defogging and defrosting
21L009-3
To remove interior fog on the windshield ±
Push the ºFRONT WINDSHIELDº button.
To remove frost or exterior fog on the windshield ±
1. Place the temperature control button at the maximum
temperature.
2. Push the ºFRONT WINDSHIELDº button.
3. Push the fan speed control button on the right side to
obtain a maximum air flow.
4. Leave the air conditioning on±off button off.
When the ºFRONT WINDSHIELDº button is pushed
while operating in automatic mode, the air conditioning
is set to operate and the OUTSIDE AIR mode is set. If you push the ºFRONT WINDSHIELDº button once
again while in the FRONT WINDSHIELD mode, the
mode then returns to the last mode used.