damper LEXUS LS430 2003 Factory Repair Manual

Fig. 6: Air Conditioning System Diagram (2 Of 2)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
1.GENERAL
a. The air conditioning system has the following features:
In compliance with the temperature set at the temperature control switch, the neural network
control calculates the outlet temperature based on the input signals from various sensors. In
addition, corrections in accordance with the signals from the evaporative temperature sensor
and the water temperature sensor are added to control the outlet air temperature.
Controls the front and rear blower motors in accordance with the airflow volume that has
been calculated by the neural network control based on the input signals from various
sensors.
Automatically switches the outlets in accordance with the outlet mode ratio that has been
calculated by the neural network control based on the input signals from various sensors.
Automatically controls the air inlet control damper in accordance with the airflow volume
that has been calculated by the neural network control.
Turns the compressor on/off and controls the discharge capacity based on the signals from
various sensors.
Based on the signals from the ambient temperature sensor, this control calculates the outside
temperature, which is then corrected in the air conditioner ECU, and shown in the multi-
information display in the combination meter.
Switched the rear defogger and outside rear view mirror heaters on for 15 minutes when the
rear defogger switch is switched on. Switched them off if the switch is pressed while they are
operating.
Controls the orientation and the angle of the front center register based on the input signals
from various sensors and on the outlet mode.
Determines whether the clean air filter (for the front A/C) is clogged by monitoring the air
inlets, and airflow volume.
The A/C amplifier automatically controls the air inlets based on the signals from the smog
ventilation sensor.
Improves the air quality by linking the air inlet control damper and the blower motor (for the
rear A/C and air purifier), based on the signals from the exhaust gas sensor and the smoke
sensor.
Checks the sensors in accordance with operation of the air conditioner switches.
2.MODEL POSITION AND DAMPER OPERATION

Fig. 7: Identifying Model Position And Damper Operation (Front Air Conditioning)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

Fig. 8: Identifying Model Position And Damper Operation (Rear Air Conditioning And Air
Purifier)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
3.AIR OUTLETS AND AIR VOLUME RATIONS

Fig. 16: Connecting Hand-Held Tester To DLC3
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
Refer to the intelligent tester II operator's manual for further details.
1.ACTUATOR CHECK
a. Turn the ignition switch to the ON position while pressing the A/C control AUTO switch and R/F
(Recirculation / Fresh) switch simultaneously.
b. Press the R/F (Recirculation / Fresh) switch.
c. As each damper, motor and relay automatically operate the actuator check at 1 second intervals
from STEP No. 1 to No. 10 continuousl
y, check the temperature and air flow visually and by hand.

ROOM TEMP
Room temperature sensor / min.: -
6.5°C (20.3°F) max.: 57.25°C
(126.95°F)
Actual room temperature is displayed-
AMBI TEMP
SENSAmbient temperature sensor /
min.: -23.3°C (-9.94°F) max.:
65.95°C (150.71°F)Actual ambient temperature is
displayed-
EVAP TEMP
Evaporator temperature sensor /
min.: -29.7°C (-21.46°F) max.:
59.55°C (139.19°F)Actual evaporator temperature is
displayed-
SOLAR SENS-DSolar sensor (Driver side) / min.:
0 max.: 255Increases as brightness increases-
SOLAR SENS-PSolar sensor (Passenger side) /
min.: 0 max.: 255decreases as brightness increases-
COOLANT
TEMPEngine coolant temperature /
min.: 1.3°C (34.34°F) max.:
90.55°C (194.99°F)Actual engine coolant temperature is
displayed while the engine is warmed
up
-
DUCT TEMP-D
Duct sensor (Driver side) / min.: -
12.7°C (9.14°F) max.: 76.55°C
(169.79°F)Actual duct temperature is displayed
(Driver side)-
DUST TEMP-P
Duct sensor (Passenger side) /
min.: -12.7°C (9.14°F) max.:
76.55°C (169.79°F)Actual duct temperature is displayed
(Passenger side)-
SET TEMP-DSet temperature (Driver side) /
min.: 0 max.: 255Actual set temperature is displayed
(Driver side)-
SET TEMP-PSet temperature (Passenger
side) /min.: 0 max.: 255Actual set temperature is displayed
(Passenger side)-
ESTIMATE
TEMP-DEstimated temperature (Driver
side) / min.: -358.4°C (-613.12°F)
max.: 358.4°C (677.12°F)Actual estimated temperature is
displayed (Driver side)-
ESTIMATE
TEMP-PEstimated temperature (Passenger
side) / min.: -358.4°C (-613.12°F)
max.: 358.4°C (677.12°F)Actual estimated temperature is
displayed (Passenger side)-
A/I DAMP POSAir inlet damper position / min.: -
14% max.: 113.5%RECIRCULATION: Approx. 0%
FRESH: Approx. 100%-
A/B DAMP POS-
DCool air bypass damper position
(Driver side) / min.: -14% max.:
113.5%OPEN: Approx. 0 % SHUT: Approx.
100%-
A/B DAMP POS-
PCool air bypass damper position
(Passenger side) / min.: -14%
max.: 113.5%OPEN: Approx. 0 % SHUT: Approx.
100%-
ItemMeasurement Item / Display
(Range)Normal ConditionDiagnostic
Note
A/I DAMP
TARGAir inlet damper target / min.: -
14% max.: 113.5%RECIRCULATION: Approx. 0%
FRESH: Approx. 100% HALF-
RECIRCULATION: 43 to 99.5 %
-

HOT.
ABODr - GND
(A37-16 - A11-1)GR - W-
BCool air bypass
servomotor operation
signal (Driver side)During actuator check mode.
Display code 0.10 to 14 V
ABODr - GND
(A37-16 - A11-1)GR - W-
BCool air bypass
servomotor operation
signal (Driver side)
Display code 9.Below 1.0 V
ABSDr - GND
(A37-17 - A11-1)GR-R -
W-BCool air bypass
servomotor operation
signal (Driver side)During actuator check mode.
Display code 0.Below 1.0 V
ABSDr - GND
(A37-17 - A11-1)GR-R -
W-BCool air bypass
servomotor operation
signal (Driver side)
Display code 9.10 to 14 V
S5-3 - SG (A37-
18 - A37-19)R-W - W-
BAir inlet damper position
sensor signalIgnition switch ON.4.5 to 5.5 V
TPI - SG (A37-20
- A37-19)B-Y - W-
BAir inlet damper position
sensor signalIgnition switch ON. Push REC
switch.4.0 V
TPI - SG (A37-20
- A37-19)B-Y - W-
BAir inlet damper position
sensor signalIgnition switch ON. Push FRESH
switch.1.0 V
TPBPa - SG
(A37-21 - A37-
19)B-L - W-
BCool air bypass
servomotor operation
signal (Passenger side)Change display code 9 to display
code 0.3.5 to 4.5 V
TPBPa - SG
(A37-21 - A37-
19)B-L - W-
BCool air bypass
servomotor operation
signal (Passenger side)Change display code 2 to display
code 3.0.5 to 1.8 V
AODB - GND
(A37-22 - A11-1)R-Y - W-
BAir outlet servomotor
operation voltage (Driver
side)
Always10 to 14 V
AMPa1 - GND
(A36-1 - A11-1)LG - W-B
Air mix servomotor
operation signal
(Passenger side)During actuator check mode.
Change display code 0 to display
code 9.Pulse
generation
AMPa2 - GND
(A36-2 - A11-1)LG-B -
W-BAir mix servomotor
operation signal
(Passenger side)During actuator check mode.
Change display code 0 to display
code 9.Pulse
generation
AMPa3 - GND
(A36-3 - A11-1)LG-W -
W-BAir mix servomotor
operation signal
(Passenger side)During actuator check mode.
Change display code 0 to display
code 9.Pulse
generation
Symbols
(Terminal No.)Wiring
colorTerminal DescriptionConditionSpecification
AMPa4 - GND
(A36-4 - A11-1)LG-R -
W-BAir mix servomotor
operation signal
(Passenger side)During actuator check mode.
Change display code 0 to display
code 9.Pulse
generation
AOPa1 - GND
(A36-5 - A11-1)P - W-B
Air outlet servomotor
operation signal
(Passenger side)During actuator check mode.
Change display code 0 to display
code 9.Pulse
generation

AOPa2 - GND
(A36-6 - A11-1)P-B - W-
BAir outlet servomotor
operation signal
(Passenger side)During actuator check mode.
Change display code 0 to display
code 9.Pulse
generation
AOPa3 - GND
(A36-7 - A11-1)P-G - W-
BAir outlet servomotor
operation signal
(Passenger side)During actuator check mode.
Change display code 0 to display
code 9.Pulse
generation
AOPa4 - GND
(A36-9 - A11-1)P-L - W-
BAir outlet servomotor
operation signal
(Passenger side)During actuator check mode.
Change display code 0 to display
code 9.Pulse
generation
S5-5 - SG-7(1)
(A36-11 - A36-
15)
R - W-L
Cool air bypass damper
position sensor signal
(Driver side)
Ignition switch ON.4.5 to 5.5 V
S5-5 - SG-7(2)
(A36-11 - A36-
15)
R - W-L
Cool air bypass damper
position sensor signal
(Passenger side)
Ignition switch ON.4.5 to 5.5 V
AMPB - GND
(A36-13 - A11-1)Y - W-B
Air mix servomotor
operation voltage
(Passenger side)
Always10 to 14 V
AIF - SG (A36-
16 - A37-19)G-R - W-
BAir inlet damper position
sensor signalIgnition switch ON. Push REC
switch.Below 1.0 V
AIF - SG (A36-
16 - A37-19)G-R - W-
BAir inlet damper position
sensor signalIgnition switch ON. Push FRESH
switch.10 to 14 V
AIR - SG (A36-
17 - A37-19)G-Y - W-
BAir inlet damper position
sensor signalIgnition switch ON. Push FRESH
switch.Below 1.0 V
AIR - SG (A36-
17 - A37-19)G-Y - W-
BAir inlet damper position
sensor signalIgnition switch ON. Push REC
switch.10 to 14 V
TE - SG-7 (A36-
20 - A36-15)L-Y - W-
LEvaporator temperature
sensor signalIgnition switch ON. Evaporator
temperature 0 °C (32 °F).2.0 to 2.4V
TE - SG-7 (A36-
20 - A36-15)L-Y - W-
LEvaporator temperature
sensor signalIgnition switch ON. Evaporator
temperature 15 °C (59 °F).1.4 to 1.8 V
TPBDr - SG-7
(A36-24 - A36-
15)B-R - W-
LCool air bypass
servomotor operation
signal (Driver side)Change display code 9 to display
code 0.3.5 to 4.5 V
TPBDr - SG-7
(A36-24 - A36-
15)B-R - W-
LCool air bypass
servomotor operation
signal (Driver side)Change display code 2 to display
code 3.0.5 to 1.8 V
AOPB - GND
(A36-26 - A11-1)Y-R - W-
BAir outlet servomotor
operation voltage
(Passenger side)
Always10 to 14 V
(1)w/o LEXUS Navigation System
(2)w/ Rear A/C

RMGV - GND
(A46-5 - A46-
6)G-Y -
W-BRear A/C switch
signalIgnition switch ON. Rear A/C AUTO mode.
Rear A/C switch ON.Below 1.0 V
RHI - GND
(A46-8 - A46-
6)L-R -
W-BRear blower
switch signalIgnition switch ON. Rear A/C blower switch
OFF.Below 1.0 V
RHI - GND
(A46-8 - A46-
6)L-R -
W-BRear blower
switch signalIgnition switch ON. Rear A/C manual mode.
Blower switch HI.10 to 14 V
RAUTO - GND
(A46-9 - A46-
6)W-L -
W-BRear A/C AUTO
switch signalIgnition switch ON. Rear A/C manual mode10 to 14 V
RAUTO - GND
(A46-9 - A46-
6)W-L -
W-BRear A/C AUTO
switch signalIgnition switch ON. Rear A/C AUTO modeBelow 1.0 V
IG - GND
(A46-10 - A46-
6)B-R -
W-BPower source
(IG)Ignition switch ON.10 to 14 V
DIO - GND
(A46-12 - A46-
6)Y-B -
W-BExhaust damper
servomotor
signalIgnition switch ON. Front A/C blower motor
operates. Rear A/C blower motor speed to HI.
Rear A/C switch ON.
10 to 14 V
DIO - GND
(A46-12 - A46-
6)Y-B -
W-BExhaust damper
servomotor
signalIgnition switch ON. Front A/C blower motor
operates. Rear A/C blower motor speed to HI.
Rear A/C switch OFF.
Below 1.0 V
Symbols
(Terminal No.)Wiring
colorTerminal
DescriptionConditionSpecification
EXO - GND
(A46-13 - A46-
6)G-W -
W-BExhaust damper
servomotor
signalIgnition switch ON. Front A/C blower motor
operates. Push "FRESH" switch. Rear AUTO
mode. Rear A/C switch ON.
10 to 14 V
EXO - GND
(A46-13 - A46-
6)G-W -
W-BExhaust damper
servomotor
signalIgnition switch ON. Front A/C blower motor
operates. Push "FRESH" switch. Rear AUTO
mode. Rear A/C switch OFF. Ambient
temperature below -1 °C
Below 1.0 V
ROO - GND
(A46-14 - A46-
6)L-B -
W-BExhaust damper
servomotor
signalIgnition switch ON. Front A/C blower motor
operates. Rear A/C blower motor speed to HI.
Rear A/C switch OFF.
10 to 14 V
ROO - GND
(A46-14 - A46-
6)L-B -
W-BExhaust damper
servomotor
signalIgnition switch ON. Front A/C blower motor
operates. Rear A/C blower motor speed to HI.
Rear A/C switch ON.
Below 1.0 V
RFR1 - GND
(A46-15 - A46-
6)G-B -
W-BRear blower
motor signalIgnition switch ON. Rear A/C blower motor
speed except to HI.10 to 14 V
RFR1 - GND
(A46-15 - A46-
6)G-B -
W-BRear blower
motor signalIgnition switch ON. Rear A/C blower motor
speed to HI.Below 1.0 V

HINT:
The followings are the possible items to be customized.
AIR CONDITIONER
AIR CONDITIONER CUSTOMIZE PARAMETERS
SMOK - Body
ground (L14-16
- Body ground)L - Body
groundSmoke sensor
operation signal
Ignition switch ON. Rear A/C switch to
AUTO. By using cigarette smoke. Ignition
switch ON. Rear A/C switch to AUTO. By
not using cigarette smoke.
Above 4.0 V
Below 1.0 V
AUTO - Body
ground (L14-17
- Body ground)W -
Body
groundAuto switch
signal
Ignition switch ON. Rear A/C rear seat
AUTO indicator lights up. Ignition switch
ON. Rear A/C rear seat AUTO indicator
does not light up.
Below 1.0 V 10 to
14 V
RHR - Body
ground (L14-18
- Body ground)V -
Body
groundRear blower
motor operation
signal
Ignition switch ON. Rear A/C manual
mode. Rear A/C blower motor does not
operate. Ignition switch ON. Rear A/C
manual mode. Rear A/C blower motor
speed LO or HI. During actuator check
mode. Display code 0. Display code 2.
10 to 14 V Below
1.0 V 10 to 14 V
Below 1.0 V
RFR - Body
ground (L14-19
- Body ground)Y -
Body
groundRear blower
motor operation
signal
Ignition switch ON. Rear A/C blower
motor speed to except HI. Ignition switch
ON. Rear A/C blower motor speed to HI.
During actuator check mode. Display code
0. Display code 2.
10 to 14 V Below
1.0 V 10 to 14 V
Below 1.0 V
FRS - Body
ground (L14-20
- Body ground)B -
Body
groundExhaust damper
servomotor
operation signal
Ignition switch ON. Front A/C blower
motor operates. Push "FRS" switch.
Ambient temperature below -1 °C Ignition
switch ON. Front A/C blower motor
operates. Push "REC" switch.
10 to 14 V Below
1.0 V
(1)w/ Rear A/C
DISPLAY (ITEM)DEFAULTCONTENTSSETTING

Fig. 31: Rear A/C Problem Symptoms Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Air Purifier
Fig. 32: Air Purifier Problem Symptoms Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Intelligent Swing Register
Fig. 33: Intelligent Swing Register Problem Symptoms Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
If a malfunction code is displayed during the DTC check (sensor check), check the circuit listed for that code in
the table below.
DIAGNOSTIC TROUBLE CODE CHART
DTCDescription
DTC B1411ROOM TEMPERATURE SENSOR CIRCUIT
DTC B1412AMBIENT TEMPERATURE SENSOR CIRCUIT
DTC B1413EVAPORATOR TEMPERATURE SENSOR CIRCUIT
DTC B1415AIR DUCT SENSOR CIRCUIT (DRIVER SIDE)
DTC B1416AIR DUCT SENSOR CIRCUIT (PASSENGER SIDE)
DTC B1418EMISSION GAS SENSOR CIRCUIT
DTC B1421SOLAR SENSOR CIRCUIT (PASSENGER SIDE)
DTC B1423PRESSURE SWITCH CIRCUIT
DTC B1424SOLAR SENSOR CIRCUIT (DRIVER SIDE)
DTC B1428REAR SOLAR SENSOR CIRCUIT
DTC B1432AIR INLET DAMPER POSITION SENSOR CIRCUIT
DTC B1434MAX COOL DAMPER POSITION SENSOR CIRCUIT (DRIVER SIDE)
DTC B1435MAX COOL DAMPER POSITION SENSOR CIRCUIT (PASSENGER SIDE)