1999 Lexus LS400 lexus LS400 1999 Electrical Components / LEXUS 1999 LS400 OWNER'S MANUAL (OM50514U)

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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.

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CAUTION
Do not use the ºFRONT WINDSHIELDº button during
cooled air operation in extremely humid weather. The
difference between the temperature of the outside air
and that of the windshield could cause the outer surface
of the windshield to fog up blocking your vision.
When you turn the ignition switch on after the removal
and installation of the battery terminal, the indicator light
may flash and the operating sound of the motor may be
heard. This does not indicate a malfunction.
You may hear the operating sound of the motor about 70
seconds after the ignition switch is turned off. This is not
also a malfunction.(c) Air filter
The air filter may clog after long use and reduce air flow.
You can inspect the filter easily.
When you inspect and replace the air filter, be sure to
turn off the fan.
21L010
1. Open the glove box and remove the two covers.

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21L011
2. Take out the air filter.
Inspect the lower surface of the filter. If it is just
moderately dusty, it may be cleaned by blowing
compressed air from the lower surface. Do not wash or
oil the filter.
If it is dirty, it should be replaced. To maintain the air
conditioning efficiency, replace the air filter according to
the maintenance schedule. (For scheduled
maintenance information, please refer to the separate
ºOwner's Manual Supplement/Maintenance
Scheduleº.)
NOTICE
Do not drive with the air filter removed, or the efficiency of air conditioning may be lost.

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(d) Operating tips
Make sure the air inlet grilles in front of the windshield
are not blocked by leaves or other obstructions.
 If air flow control is not satisfactory, check the
dashboard vents. (See ºCenter ventsº, ºSide ventsº,
ºLower ventº and ºRear ventsº.)
 To help cool down the interior after parking in the hot
sun, drive for the first few minutes with the windows
open. After the excess heat has blown away, close
the windows.
 When driving on dusty roads, close all windows. If
dust thrown up by the vehicle is still drawn into the
vehicle after closing the windows, it is recommended
that the air intake control button be left to the
OUTSIDE AIR mode and the fan speed control button
be pressed to anywhere except the ºOFFº button.
 If following another vehicle on a dusty road, or driving
in windy and dusty conditions, it is recommended that
the air intake control button be temporarily pressed in
to the RECIRCULATED AIR mode, which will close
off the outside passage and prevent outside air and
dust from entering the vehicle interior.

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Center vents
21L012±1
The center vents may be opened or closed as
shown.Side vents
21L013
The side vents may be opened or closed as shown.Lower vent

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21L014
The lower vent may be opened or closed as shown.Rear vents
21L015
The rear vents may be opened or closed as shown.