2006 Lexus GS430 heating

AIR CONDITIONING
264“DUAL” switch—
This switch is used to set the temperatures independently for
the driver’s seat and front passenger seat.
Touching the switch changes from the independent mode to
the linked mode.

Independent mode: Temperatures can be set
independently for the driver’s seat and front passenger’s
seat. The indicator light will come on to show that the
independent mode has been selected.
 Linked mode: The same temperature is set for the driver’s
seat and front passenger’s seat. The indicator light will turn
off to show that the simultaneous temperature setting mode
has been selected.
When the temperature for the front passenger’s seat is
changed in linked mode, the mode is changed automatically to
independent mode.
INFORMATION
Knowledge for the twotemperature selector operation
This air conditioning system has two independent
temperature selectors: left and right (for the use of
driver and front passenger respectively).
 There are cases where the temperature of the air flow
may not accurately correlate on the driver and front
passenger side according to circumstances, even if
the left and right temperature selectors are set at the
same temperature. If this situation occurs, use the
fine tune operation to adjust the air temperature on
one side.
 There are cases where one or both of the air flow
temperatures may not accurately correlate with the
set temperature according to circumstances, when
the air flow temperature settings on the left and right
are substantially different. For example, if the left
controller is set at central or neutral temperature
while the right one is set at maximum heating or
maximum cooling, or vice versa. If this situation
occurs, use the fine tune operation to adjust the air
temperature on each side.

AIR CONDITIONING
267
To prevent fogging up of the windshield, the air intake mode
may change automatically to the OUTSIDE AIR mode
depending on the condition of the air conditioning system.
For example, when the ambient temperature is low, the air
intake mode may change automatically to the OUTSIDE AIR
mode. This is not a malfunction.
When the air conditioning is on, if the engine coolant
temperature becomes extremely high, the RECIRCULATED
AIR mode is automatically selected. This is not a malfunction.
When
the engine coolant temperature is lowered, the previous
mode resumes.
Turning off the air conditioning manually will cancel the
EXHAUST GAS AUTOMATIC mode. If you select the “AUTO”
mode during fan operating, the air conditioning turns on and
the EXHAUST GAS AUTOMATIC mode will operate.
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 AIR and OUTSIDE AIR in the
AUTOMATIC mode, push the air intake control button and
hold it for a few seconds. The display changes to the one
illustrated below.
The sensitivity of the sensor can be adjusted only while the
vehicle has been stopped.
G21023
The sensitivity of the switches is set to be higher toward “HI”
and lower toward “LO”.
Touch the desired switch on the screen.
When
you push any button except the air intake control button,
the above screen goes off.

AIR CONDITIONING
268If manual onoff of the air conditioning is desired—
Touch
the ”A/C” switch to turn the air conditioning on and touch
it again to turn the air conditioning off. If you turn off the air
conditioning manually, the EXHAUST GAS AUTOMATIC
mode will be cancelled.
If the outside temperature is lowered down to around 0 C
(32 F), the air conditioning will turn off automatically. At this
time, the indicator on the A/C switch is off and the EXHAUST
GAS AUTOMATIC indicator light remains on. However, the
EXHAUST GAS AUTOMA TIC mode does not operate. When
the air conditioning turns on as with the raised temperature, the
EXHAUST GAS AUTOMATIC mode resumes.
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 ”A/C” switch will blink. If the indicator of the
”A/C” switch blinks even when the ”A/C” switch is touched
again, have the compressor checked by your nearest Lexus
dealer.
(b) Windshield defogging and defrosting
G21010
To remove interior fog on the windshield—
Push the windshield air flow button.
To remove frost or exterior fog on the windshield—
1. Push the “TEMP” (”
”) button to set the “HI”.
2. Push the windshield air flow button.
3. Touch fan speed control switch on the right side to obtain a
maximum air flow.
4. Leave the “A/C” switch off.

AIR CONDITIONING
269
When the windshield air flow button is pushed while operating
in automatic mode, the air conditioning is set to operate and the
OUTSIDE AIR mode is set. This is to clean up the front view
more quickly. If you want
to return the setting to the
RECIRCULATED AIR mode, push the air intake control button
once again.
Touch the “A/C” switch for dehumidified heating or cooling.
This setting clears the front view more quickly.
If you push the windshield air flow button once again while in
the windshield air flow mode, the mode then returns to the last
mode used.
CAUTION
Do not use the windshield air flow 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.
(c) Micro dust and pollen filter
This vehicle is equipped with a micro dust and pollen filter
mode. When this mode is activated, air from the vents will
remove pollen on the driver and passengers.
Use this mode to remove pollen quickly carried by the
driver or passengers or through the window in the days
with much pollen.
G21073
Push the micro dust and pollen filter button.
The indicator light comes on and RECIRCULATED AIR mode
is turned on. Air is delivered from the instrument panel vents
to the areas near the driver and passengers to remove pollen
on them. When the interior is purified sufficiently with fresh air
after about 3 minutes, this mode will be turned off automatically
and the indicator light will go out.

AIR CONDITIONING
271

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.
Heating
For best results, set controls to:
For automatic operation—
Push in the “AUTO” button.
Temperature—To the desired temperature
Air intake—OUTSIDE AIR
Air conditioning—OFF
For manual operation—Fan speed—To the desired fan speed
Temperature—Towards high temperature
Air intake—OUTSIDE AIR
Air flow—FLOOR
Air conditioning—OFF
 For quick heating, select RECIRCULATED AIR mode for a
few minutes. To keep the windows from fogging, select
OUTSIDE AIR mode after the vehicle interior has been
warmed.
 Touch the “A/C” switch on for dehumidified heating.
 Choose floor/windshield air flow to heat the vehicle interior
while defrosting or defogging the windshield.
Air conditioning
For best results, set controls to:
For automatic operation—
Push in the “AUTO” button.
Temperature—To the desired temperature
Air intake—OUTSIDE AIR
Air conditioning—ON

AIR CONDITIONING
273
Touch the “A/C” switch for dehumidified heating or cooling.
This setting clears the front view more quickly.

Only humid days, do not blow cold air on the
windshield—the dif ference between the outside and inside
temperatures could make the fogging worse.
—The outside of the windshield
For best results, set controls to:
For automatic operation—
Temperature— Towards high temperature
Air intake—OUTSIDE AIR
Air flow—WINDSHIELD
For manual operation—Fan speed—To the desired fan speed
Temperature— Towards high temperature
Air intake—OUTSIDE AIR
Air flow—WINDSHIELD
When the windshield air flow button is pushed, air flows mainly
from the windshield vents and turns on the defogging function
with the purpose of clearing the front view.
Pushing this button once again returns the air flow mode to the
last one used. This
button allows the air intake to select OUTSIDE AIR mode
automatically. This is to clean up the front view more quickly.
If you want to return the setting to RECIRCULATED AIR mode,
push the air intake control button once again.
Touch the “A/C” switch for dehumidified heating or cooling.
This setting clears the front view more quickly.
 To heat the vehicle interior while defrosting the windshield,
choose floor/windshield air flow.
(e) Center vents, side vents and rear vents
G21015
Center vents

STARTING AND DRIVING
347

Avoid racing the engine.
 Do not pushstart or pullstart your vehicle.
 Do not turn off the engine while the vehicle is moving.
 Keep your engine in good running order.
Malfunctions in the engine electrical system,
electronic ignition system or fuel system could cause
an extremely high threeway catalytic converter
temperature.
 If the engine becomes difficult to start or stalls
frequently, take your vehicle in for a checkup as
soon as possible. Remember, your Lexus dealer
knows your vehicle and its threeway catalytic
converter system best.
 To ensure that the threeway catalytic converter and
the entire emission control system operate properly,
your vehicle must receive the periodic inspections
required by the Lexus Maintenance Schedule. For
scheduled maintenance information, refer to the
“Owner’s Manual Supplement / Scheduled
Maintenance”.
ENGINE EXHAUST CAUTION
CAUTION
Avoid inhaling the engine exhaust. It contains
carbon monoxide, which is a colorless and odorless
gas. It can cause unconsciousness or even death.
 Make sure the exhaust system has no holes or loose
connections. The system should be checked from
time to time. If you hit something, or notice a change
in the sound of the exhaust, have the system checked
immediately.
 Do not run the engine in a garage or enclosed area
except for the time needed to drive the vehicle in or
out. The exhaust gases cannot escape, making this
a particularly dangerous situation.
 Do not remain for a long time in a parked vehicle with
the engine running. If it is unavoidable, however, do
so only in an unconfined area and adjust the heating
or cooling system to force outside air into the vehicle.
 Keep the trunk lid closed while driving. An open or
unsealed trunk lid may cause exhaust gases to be
drawn into the vehicle.

STARTING AND DRIVING
431
VARIABLE GEAR RATIO STEERING SYSTEM (GS430 only)
The variable gear ratio steering system adjusts the wheel
turning angle depending on the vehicle speed and how
much you turn the steering wheel.
The vehicle wheel turning angle will be changed with a smaller
degree of wheel maneuvering when you are driving at very low
speed such as when putting your vehicle into a garage.
When you start or stop the engine, you may hear a small noise
and the steering wheel may move slightly. This is caused when
the system starts or stops, and does not indicate a malfunction.
In the following cases, to prevent the system from overheating,
the system could be temporarily deactivated with the change
in the center position of the steering wheel. This is not a
malfunction. After the cause of the problem is eliminated, the
system will return to normal automatically after a few minutes.
 If you continue maneuvering the steering wheel when the
vehicle is stopped or running at very low speed
 If you continue driving holding the steering wheel to the
extreme right or left
 If you maneuver the steering wheel immediately after
starting the engine at less than about −30C (− 22F) While the system is not functioning, a larger degree of wheel
maneuvering is needed during driving at low speed. If the
center position of the steering wheel is changed frequently,
have your vehicle inspected at your Lexus dealer.CAUTION
Take due care especially when driving at low speed as
the vehicle changes direction in greater proportion to
the steering wheel maneuvering.
NOTICE
Do not disconnect the battery with the steering wheel
turned, or the center position of the steering wheel
could be slightly and temporarily changed. However,
after driving for a short while, the system will return to
normal
and the center position of the steering wheel will
be in the appropriate position.
If you disconnect and reconnect the battery terminal, the
system is reset temporarily. However, it is no problem to drive.
Drive for a short while, the system will be set automatically and
return to normal.