1998 Lexus LS400 lexus LS400 1998 Engine / LEXUS 1998 LS400 OWNER'S MANUAL (OM50498U)

AIR CONDITIONING AND AUDIO
122
1
Driver side temperature control button
2
Front windshield button
3
Driver side temperature display (in degrees Fahrenheit or
Centigrade)
4
Fan speed display
5
Air intake control button
6
Air flow display
7
Air conditioning onoff button
8
Passenger side temperature control button
9
Passenger side temperature display (in degrees Fahrenheit
or Centigrade)
10Separate/dual control button
11Air flow control button
12Fan speed control button
13OFF button
14Automatic control button

AIR CONDITIONING AND AUDIO
123
21L002-6
Air flow selection

AIR CONDITIONING AND AUDIO
124
(a) Climate control
SETTING OPERATION automatic control
21L003-3
1. Push the ”AUTO” button.
Air flow quantity, switching of the diffusers, onoff 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 ”OFF” button to turn the air conditioning off.
21L0401
2. Use the ”TEMP” or ”PASSENGER TEMP” button to set the
desired temperature.
The ”TEMP” or ”PASSENGER TEMP” button is used to set the
desired temperature. The temperature will be controlled on the
driver and passenger sides simultaneously or individually.
”TEMP” button Changes the temperature on the driver and
passenger sides simultaneously or the driver side only.
”PASSENGER TEMP” button Changes the temperature on the
passenger side only.
”DUAL” button Changes the mode of the temperature setting.
The indicator on the ”DUAL” button has two modes:
With the indicator on For individual temperature setting
With the indicator off For simultaneous temperature setting

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125
21L005-2
Driver side setting
Passenger side setting
Mixed settingSETTING OPERATION manual control
If manual air flow selection is desired
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:
1
Panel Air flows mainly from the instrument panel vents.
2
Bilevel Air flows from both the floor vents and the
instrument panel vents.
3
Floor Air flows mainly from the floor vents.
4
Floor/Windshield Air flows mainly from the floor vents and
windshield vents.

AIR CONDITIONING AND AUDIO
126If quick heating or cooling is desired
Push the ”TEMP” or ”PASSENGER TEMP” button on either side
and hold it until ”MAX. HOT” or ”MAX. COLD” appears on the
display.
If manual fan speed control is desired
21L007-3
1
Fan speed at low 2
Fan 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 ”OFF” button turns
off the fan.
To remove exterior windshield frost, use the high speed setting.If manual switching of air intake is desired
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.
1
RECIRCULATED mode If quick circulation of cooled air
is desired, select this mode.
2
AUTOMATIC 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.
3
OUTSIDE AIR mode The system will take fresh outside air
into the vehicle.

AIR CONDITIONING AND AUDIO
127 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.
21L044
Each time you push the ”TEMP” button, the sensitivity changes from
”+3” down to ”3”. If you do not operate any button for a few
seconds, the previous display returns.If manual onoff of the air conditioning is desired
Push the ”A/C” 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 0C (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 yearround
automatic temperature control including cooling and dehumidifying
operation.
If the air conditioning compressor does not operate, the indicator of
the ”A/C” button will blink. If the indicator of the ”A/C” button
blinks even when the ”A/C” button is pushed again, have the
compressor checked by your nearest Lexus dealer.

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128
(b) Windshield defogging and defrosting
21L009-3
To remove interior fog on the windshield
Push the”FRONT WINDSHIELD” button.
To remove frost or exterior fog on the windshield
1. Place the temperature control button at the maximum
temperature.
2. Push the ”FRONT WINDSHIELD” button.
3. Push the fan speed control button on the right side to obtain a
maximum air flow.
4. Leave the air conditioning onoff button off.When the ”FRONT WINDSHIELD” 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 ”FRONT WINDSHIELD” button once again while
in the FRONT WINDSHIELD mode, the mode then returns to the
last mode used.
CAUTION
Do not use the ”FRONT WINDSHIELD” 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.

AIR CONDITIONING AND AUDIO
129
(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 glovebox and remove the two covers.
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 ”Owner’s Manual Supplement/Maintenance
Schedule”.)
NOTICE
Do not drive with the air filter removed, or the efficiency of air
conditioning may be lost.