2003 LEXUS LS430 air condition

Fig. 22: Identifying Air Conditioning Amplifier Connector Front View
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
AIR CONDITIONING AMPLIFIER CONNECTOR SPECIFICATIONS
ItemTest Details / Display (Range)Diagnostic Note
ACTUATOR CHECKActuator check / OFF, ON-
Symbols
(Terminal No.)Wiring
colorTerminal DescriptionConditionSpecification
GND - Body
ground (A11-1 -
Body ground)W-B -
Body
groundGround for main power
supplyAlwaysBelow 1.0
ohms
MPX+ (A11-2)GR-BMultiplex communication
systemMultiplex communication circuit-
ACC - GND
(A11-3 - A11-1)GR - W-
BPower source (ACC)Turn ignition switch to ACC.10 to 14 V
MPX- (A11-4)GR-BMultiplex communication
systemMultiplex communication circuit-
BLW - GND
(A11-5 - A11-1)LG-B -
W-BBlower motor speed
control voltageBlower fan speed OFF --> M2 -->
HIPulse
generation
SOL+ - SOL-
(A11-6 - A11-7)P - Y-BCompressor operation
signalA/C magnetic clutch to ON.Pulse
generation
RDFGR - GND
(A11-8 - A11-1)W - W-BRear defogger operation
voltageIgnition switch ON. Rear
defogger switch to OFF.10 to 14 V
RDFGR - GND
(A11-8 - A11-1)W - W-BRear defogger operation
voltageIgnition switch ON. Rear
defogger switch to ON.Below 1.0 V
IG - GND (A11-9
- A11-1)LG-R -
W-BPower source (IG)Ignition switch ON.10 to 14 V

side)code 9.
AODr1 - GND
(A37-5 - A11-1)L - W-B
Air outlet servomotor
operation signal (Driver
side)During actuator check mode.
Change display code 0 to display
code 9.Pulse
generation
AODr2 - GND
(A37-6 - A11-1)L-B - W-
BAir outlet servomotor
operation signal (Driver
side)During actuator check mode.
Change display code 0 to display
code 9.Pulse
generation
WVS - GND
(A37-7 - A11-1)G-W - W-
BWater valve servomotor
operation signalIgnition switch ON. Set
temperature control to MAX.
COOL
Below 1.0 V
WVS - GND
(A37-7 - A11-1)G-W - W-
BWater valve servomotor
operation signalIgnition switch ON. Set
temperature control to MAX.
HOT
10 to 14 V
ABOPa - GND
(A37-8 - A11-1)G-B - W-
BCool air bypass
servomotor operation
signal (Passenger side)During actuator check mode.
Display code 0.10 to 14 V
ABOPa - GND
(A37-8 - A11-1)G-B - W-
BCool air bypass
servomotor operation
signal (Passenger side)
Display code 9.Below 1.0 V
Symbols
(Terminal No.)Wiring
colorTerminal DescriptionConditionSpecification
ABSPa - GND
(A37-9 - A11-1)G-O - W-
BCool air bypass
servomotor operation
signal (Passenger side)During actuator check mode.
Display code 0.Below 1.0 V
ABSPa - GND
(A37-9 - A11-1)G-O - W-
BCool air bypass
servomotor operation
signal (Passenger side)
Display code 9.10 to 14 V
AMDB - GND
(A37-10 - A11-1)R-B - W-
BAir mix servomotor
operation voltage (Driver
side)
Always10 to 14 V
AODr3 - GND
(A37-12 - A11-1)L-W - W-
BAir outlet servomotor
operation signal (Driver
side)During actuator check mode.
Change display code 0 to display
code 9.Pulse
generation
AODr4 - GND
(A37-13 - A11-1)L-R - W-
BAir outlet servomotor
operation signal (Driver
side)During actuator check mode.
Change display code 0 to display
code 9.Pulse
generation
WVIG - GND
(A37-14 - A11-1)O - W-BWater valve servomotor
operation voltageIgnition switch ON.10 to 14 V
WVIG - GND
(A37-14 - A11-1)O - W-BWater valve servomotor
operation voltageIgnition switch OFF.0 V
WVO - GND
(A37-15 - A11-1)G - W-BWater valve servomotor
operation signalIgnition switch ON. Set
temperature control to MAX.
COOL.
10 to 14 V
WVO - GND
(A37-15 - A11-1)G - W-BWater valve servomotor
operation signalIgnition switch ON. Set
temperature control to MAX. Below 1.0 V

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

Fig. 23: Identifying Rear Air Conditioning Amplifier Connector Front View
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
REAR AIR CONDITIONING AMPLIFIER CONNECTOR SPECIFICATIONS
Symbols
(Terminal No.)Wiring
colorTerminal
DescriptionConditionSpecification
RLO - GND
(A46-1 - A46-
6)
Y - W-BRear blower
switch signalIgnition switch ON. Rear A/C blower switch
manual OFF.Below 1.0 V
RLO - GND
(A46-1 - A46-
6)
Y - W-BRear blower
switch signalIgnition switch ON. Rear A/C blower switch
manual LO.10 to 14 V
RSLO - GND
(A46-2 - A46-
6)W-Y -
W-BRear A/C switch
signalIgnition switch ON. Rear A/C switch OFF.Below 1.0 V
RSLO - GND
(A46-2 - A46-
6)W-Y -
W-BRear A/C switch
signalIgnition switch ON. Rear A/C switch AUTO.10 to 14 V
R-B - GND
(A46-3 - A46-
6)L-W -
W-BPower source
(Back-up)Always10 to 14 V
SFRS - GND
(A46-4 - A46-
6)
V - W-B
Rear air inlet
control switch
signalIgnition switch ON. Front A/C blower motor
operates. Push "REC" switch.10 to 14 V
SFRS - GND
(A46-4 - A46-
6)
V - W-B
Rear air inlet
control switch
signalIgnition switch ON. Front A/C blower motor
operates. Push "FRS" switch. Ambient
temperature below -1 °C
Below 1.0 V
RMGV - GND
(A46-5 - A46-
6)G-Y -
W-BRear A/C switch
signalIgnition switch ON. Rear A/C switch OFF.10 to 14 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

1.STEP MOTORS INITIALIZING FUNCTION
STEP motor initializing procedure (Automatic initializing)
1. When the battery is reconnected and the ignition switch is turned to the ON position for the first
time, the initializing function of the STEP motors is activated. In this case, the "FRONT DEF"
indicator blinks.
SET TEMP SHIFT
(Set Temperature
Shift)
NORMALTo control with the shifted temperature
against the display temperature.+2C/+1C/ NORMAL -
1C / -2C
AIR INLET MODE
(Air Inlet Mode)AUTO
In case of turning the A/C ON when you
desire to make the compartment cool down
quickly, this is the function to change the
mode automatically to RECIRCULATED
mode.
MANUAL / AUTO
COMPRESSOR
MODE (Compressor
Mode)
AUTO
Function to turn the A/C ON automatically
by pressing the AUTO button when the
blower is ON and the A/C is OFF.
MANUAL / AUTO
COMPRS/DEF OPER
(Compressor/Air Inlet
DEF Operation)
LINK
Function to turn the A/C ON automatically
linking with the FRONT DEF button when
A/C is OFF.
NORMAL / LINK
MOTOR INITIALIZ
(STEP Motor
Initializing (IG/off))
OFFFunction to initialize the STEP motor after
the ignition switch is OFF.ON / OFF
EVAP CTRL
(External Variable
Control OFF)
AUTO
Function to set the evaporator control to the
AUTOMATIC position (AUTO) to save
power or to the coldest position
(MANUAL) to dehumidify the air and to
prevent the windows from fogging up.
MANUAL / AUTO
GAS SENS SHIFT
(Shift Emission Gas
Sensor Sensitivity)
NORMALFunction to change the sensitivity of the
exhaust gas sensor.
MU MORE /MORE / LI
MORE / NORMAL / LI
LESS / LESS / MU
LESS
AUTO MODE
(Cancel Auto Mode)AUTOFunction to swing the vent vans
automatically when A/C is ON.MANUAL / AUTO
BUTTON PRS BUS
(Cancel Operating
Switch Sound)
ONFunction to sound a buzzer when a button
is pressed.OFF / ON
FILTER SENS (Shift
Filter Clog Sensitivity)NORMALFunction to change the sensitivity of the air
conditioning filter choking sensor.LESS / NORMAL /
MORE
FOOT AIR LEAK
(Cancel Air Outlet
Foot II)
ONFunction to cut off the airstream felt
underfoot while the vehicle is moving.OFF / ON

Fig. 36: Room Temperature Sensor Circuit
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE
1.READ VALUE ON HAND-HELD TESTER
a. Connect the hand-held tester to the DLC3.
b. Turn the ignition switch to the ON position and push the hand-held tester main switch on.
c. Select the item below in the DATA LIST, and read the display on the hand-held tester.
DATA LIST / AIR CONDITIONER:
DATA LIST / AIR CONDITIONER
OK:
The display is as specified in the normal condition.
Result:
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
ROOM
TEMPRoom temperature sensor / min.: -6.5°C (20.3°F)
max.: 57.25°C (126.95°F)Actual room temperature
is displayed-

AIR CONDITIONER TEST RESULT
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
A
2.INSPECT COOLER (ROOM TEMPERATURE SENSOR) THERMISTOR
a. Remove the cooler (room temperature sensor) thermistor.
b. Measure the resistance according to the value (s) in the table below.
Standard:
COOLER (ROOM TEMPERATURE SENSOR) THERMISTOR RESISTANCE
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A14-1 - A14-210°C (50°F)3.00 to 3.73 kohms
A14-1 - A14-215°C (59°F)2.45 to 2.88 kohms
A14-1 - A14-220°C (68°F)1.95 to 2.30 kohms
A14-1 - A14-225°C (77°F)1.60 to 1.80 kohms
A14-1 - A14-230°C (86°F)1.28 to 1.47 kohms
A14-1 - A14-235°C (95°F)1.00 to 1.22 kohms
A14-1 - A14-240°C (104°F)0.80 to 1.00 kohms
A14-1 - A14-245°C (113°F)0.65 to 0.85 kohms
A14-1 - A14-250°C (122°F)0.50 to 0.70 kohms
A14-1 - A14-255°C (131°F)0.44 to 0.60 kohms
A14-1 - A14-260°C (140°F)0.36 to 0.50 kohms