2009 Lexus IS250 heating

Finish
AIR CONDITIONING
254
(a) Climate control
SETTING OPERATION−automatic con-
trol
1. Push the “AUTO” button.
An indicator light will illuminate to show
that the automatic operation mode has
been selected.
Air flow quantity, switching of the diffusers,
on− off of the air conditioning, and switch-
ing of the air intake between RECIRCU-
LATED AIR and OUTSIDE AIR are auto-
matically adjusted. The operation status is
shown by each indicator.
When one of the manual control buttons is
depressed while operating in automatic
mode, the mode relevant to the depressed
button is set. Other conditions continue to
be adjusted automatically.
Push the “OFF”button to turn the fan off.
INFORMATION
DThis automatic control has addi-
tional function as described below,
when the “AUTO” button is
pushed.
The fan speed is stopped for a little
while until warm air preparation,
when outside temperature is cold
like a winter season in the “Floor”,
“Bi− level” or “Floor/Windshield”
air flow mode. If quick removal for
exterior frost, fog and inside fog on
the windshield is desired, use the
high fan speed setting after the
“Windshield” air flow mode has
been selected.
The fan speed is stopped few sec-
onds until cool air preparation,
when outside temperature is hot
like a summer season in the “Pan-
el” or “Bi− level” air flow mode.
D The internal circulation may be ap-
plied for maximum cooling in the
automatic operation mode, when
outside temperature is hot like a
summer season.
If fresh outside air is desired into
the vehicle, push the air intake
control button to select the OUT-
SIDE AIR mode.
D The “Floor/Windshield” air flow
mode may be applied automatical-
ly, if the outside temperature is
lowered down to below 0 _C (32 _F).
This is not malfunction. The
“Floor/Windshield” air flow mode
turns on the defogging and de-
frosting function with the purpose
of cleaning your front view for safe
driving.
If the “Floor” air flow mode is de-
sired with the main purpose of
heating, “Floor” air flow mode can
be selected manually by touching
the air flow control button.
IS F/350/250_Navi_U
(L/O 0808)

Finish
AIR CONDITIONING
255
2. Use the “TEMP” or “PASSENGER
TEMP” button to set the desired vehicle
interior temperature.
The“TEMP” or“PASSENGER TEMP”
(“
” ,“” ) buttons are used to set the de-
sired interior temperature. The interior
temperature will be controlled on the driver
and passenger side simultaneously or in-
dividually.
To increase the interior temperature, push
the “
”button, to decrease it, push the
“” button.
If quick heating or cooling is desired —
“LO” appears when you hold it until maxi-
mum cooling (decrease), and “HI” appears
when you hold it until maximum warning
(increase).
“TEMP” button — Changes the tempera-
ture on the driver and passenger sides si-
multaneously or the driver side only.
“PASSENGER TEMP” button —
Changes the temperature settings sepa-
rate from the driver side.
“DUAL” —
This button is used to set the temperatures
independently for the driver ’s seat and
front passenger seat.
Touching the button changes from the in-
dependent mode to the linked mode.
Independent mode: Temperatures can
be set independently for the driver ’s seat
and front passenger ’s seat. The indicator
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 passen-
ger’s seat. The indicator will come off to
show that the simultaneous temperature
setting mode has been selected.
When the temperature for the front pas-
senger ’s seat is changed in linked mode,
the mode is changed automatically to inde-
pendent mode.
IS F/350/250_Navi_U
(L/O 0808)

Finish
AIR CONDITIONING
256
INFORMATION
Knowledge for the two−temperature
selector operation:
This air conditioning system has two
independent temperature selectors:
left and right (for the use of driver and
front passenger respectively).
D There are cases where the temper-
ature of the airflow may not accu-
rately 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 sit-
uation occurs, use the fine tune op-
eration to adjust the air tempera-
ture on one side.
D There are cases where one or both
of the airflow temperatures may
not accurately correlate with the
set temperature according to cir-
cumstances, when the airflow tem-
perature settings on the left and
right are substantially different.
For example, if the left controller is
set at central or neutral tempera-
ture while the right one is set at
maximum heating or maximum
cooling, or vice versa. If this situa-
tion occurs, use the fine tune op-
eration to adjust the air tempera-
ture on each side.
Driver side setting air flow
Passenger side setting air flow
Mixed air flow
IS F/350/250_Navi_U
(L/O 0808)

Finish
AIR CONDITIONING
258
If manual switching of air intake is de-
sired —
Each time you push the air intake control
button, the mode changes in order from
the RECIRCULATED AIR mode to AUTO-
MATIC mode to OUTSIDE AIR mode, then
back to the RECIRCULATED AIR mode.
Each indicator light shows which mode is
now selected.
1 RECIRCULATED AIR mode —If
quick circulation of cooled air is de-
sired, select this mode.
2 EXHAUST GAS AUTOMATIC mode (on some models) — If the outside
air contains harmful substances like
exhaust gas (i.e., when the vehicle
running just in front of your vehicle ac-
celerates rapidly), the system
changes automatically from the
OUTSIDE AIR mode (with indicators
2 and3on) to the RECIRCU-
LATED AIR mode (with indicators
1 and2on).
3 OUTSIDE AIR mode — The system
will take fresh outside air into the ve-
hicle. Turning off the air conditioning manually
will cancel the EXHAUST GAS AUTO-
MATIC mode. If you select the “AUTO”
mode during fan operating, the air condi-
tioning turns on and the EXHAUST GAS
AUTOMATIC mode will operate.
For normal use, it is best to keep the air in-
take control button set to OUTSIDE AIR
mode. If recirculated air is used during
heating, the windows will fog up more easi-
ly.
IS F/350/250_Navi_U
(L/O 0808)

Finish
AIR CONDITIONING
264
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
DFor quick heating, select RECIRCU-
LATED AIR mode for a few minutes. To
keep the windows from fogging, select
OUTSIDE AIR mode after the vehicle
interior has been warmed.
DTouch “A/C” on for dehumidified heat-
ing.
DChoose floor/windshield air flow to
heat the vehicle interior while defrost-
ing 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
For manual operation —
Fan speed — To the desired fan speed
Temperature — Towards low
temperature
Air intake — OUTSIDE AIR
Air flow — PANEL
Air conditioning — ON
DFor quick cooling, select RECIRCU-
LATED AIR mode for a few minutes.
Ventilation
For best results, set controls to:
For automatic operation —
Push in the “AUTO” button.
Temperature — Towards low
temperature
Air intake — OUTSIDE AIR
Air conditioning — OFF
For manual operation —
Fan speed — To the desired fan speed
Temperature — Towards low
temperature
Air intake — OUTSIDE AIR
Air flow — PANEL
Air conditioning — OFF
IS F/350/250_Navi_U
(L/O 0808)

Finish
AIR CONDITIONING
265
Defogging and defrosting
−The inside of the windshield
For best results, set controls to:
For automatic operation —
Temperature — Towards high
temperature to heat;
low temperature to
cool
Air intake — OUTSIDE AIR
Air flow — WINDSHIELD
For manual operation —
Fan speed — To the desired fan speed
Temperature — Towards high
temperature to heat;
low temperature to
cool
Air intake — OUTSIDE AIR
Air flow — WINDSHIELD
When the windshield air flow button is
pushed, air flows mainly from the wind-
shield 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 RECIR-
CULATED AIR mode, push the air intake
control button once again.
Touch “A/C” for dehumidified heating or
cooling. This setting clears the front view
more quickly.
DOn humid days, do not blow cold air on
the windshield −the difference be-
tween the outside and inside tempera-
tures 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 wind-
shield 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 RECIR-
CULATED AIR mode, push the air intake
control button once again.
Touch “A/C” for dehumidified heating or
cooling. This setting clears the front view
more quickly.
DTo heat the vehicle interior while de-
frosting the windshield, choose floor/
windshield air flow.
IS F/350/250_Navi_U
(L/O 0808)