wiring LEXUS LS430 2003 Factory Service Manual

IG - GND (A11-9
- A11-1)LG-R -
W-BPower source (IG)Ignition switch OFF.0 V
TSDr - GND
(A11-19 - A11-1)L - W-BSolar sensor signal (Driver
side)Ignition switch ON. Solar sensor
subjected to electric light.0.8 to 4.3 V
TSDr - GND
(A11-19 - A11-1)L - W-BSolar sensor signal (Driver
side)Ignition switch ON. Solar sensor
covered by a cloth.Below 0.8 V
TSPa - GND
(A11-20 - A11-1)G-R - W-
BSolar sensor signal
(Passenger side)Ignition switch ON. Solar sensor
subjected to electric light.0.8 to 4.3 V
TSPa - GND
(A11-20 - A11-1)G-R - W-
BSolar sensor signal
(Passenger side)Ignition switch ON. Solar sensor
covered by a cloth.Below 0.8 V
+B - GND (A11-
21 - A11-1)B-Y - W-
BPower source (Back-up)Always10 to 14 V
DGS - SG-1
(A11-29 - A13-8)B - YExhaust gas sensor signal
After 30 seconds from Ignition
switch ON and the sensor is
exposed to the exhaust gas.
1.0 to 4.5 V
DS1 - GND
(A12-1 - A11-1)V - W-BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
Symbols
(Terminal No.)Wiring
colorTerminal DescriptionConditionSpecification
DS2 - GND
(A12-2 - A11-1)G - W-BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
PS1 - GND (A12-
3 - A11-1)R-B - W-
BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
PS2 - GND (A12-
4 - A11-1)B - W-BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
PS3 - GND (A12-
5 - A11-1)P - W-BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
PS4 - GND (A12-
6 - A11-1)Y-R - W-
BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
DUAL - DrGND
(A12-7 - A12-11)O - LG-RDual temperature control
signalIgnition switch ON. Dual switch
ON.Below 1.0 V
DUAL - DrGND
(A12-7 - A12-11)O - LG-RDual temperature control
signalIgnition switch ON. Dual switch
OFF.10 to 14 V

DS3 - GND
(A12-8 - A11-1)B-R - W-
BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
DS4 - GND
(A12-9 - A11-1)G-B - W-
BSwing grill STEP motor
signal
Ignition switch ON. Blower
motor: Operating Mode selector:
BI-LEVEL Intelligent swing
register: ON
Pulse
generation
DUIND+ -
DUIND - (A12-
10 - A12-13)G-R - B-
WDriver temperature and
passenger temperature
communication signalDriver temperature and passenger
temperature are different.5 to 14 V
DUIND+ -
DUIND- (A12-10
- A12-13)G-R - B-
WDriver temperature and
passenger temperature
communication signalDriver temperature and passenger
temperature are the same.Below 1.0 V
S5-2 - SG-5
(A12-15 - A13-
12)
V-R - LGPressure sensor operation
voltageIgnition switch ON.4.5 to 5.5 V
S5-4 - TSRr(2)
(A12-16 - A11-
30)
GR - W-LRear solar sensor signalIgnition switch ON. Rear solar
sensor subjected to electric light.0.8 to 4.3 V
S5-4 - TSRr(2)
(A12-16 - A11-
30)
GR - W-LRear solar sensor signalIgnition switch ON. Rear solar
sensor covered by a cloth.Below 1.0 V
PRS - SG-5
(A12-17 - A13-
12)
V - LGPressure sensor signalRefrigerant pressure 0 Mpa (0
kgf.cm, 0 psi).0.5V
PRS - SG-5
(A12-17 - A13-
12)
V - LGPressure sensor signalRefrigerant pressure 2.9 Mpa (30
kgf.cm, 427 psi).4.5 V
TAMOUT - GND
(1) (A12-18 -
A11-1)L - W-BVehicle speed signalIgnition switch ON.Pulse
generation
PaDN - PaGND
(A12-19 - A12-
12)R-W - Y-
RTemperature control
switch signal (Passenger
side)Push passenger temperature
switch OFF.10 to 14 V
PaDN - PaGND
(A12-19 - A12-
12)R-W - Y-
RTemperature control
switch signal (Passenger
side)Push passenger temperature
switch ON.Below 1.0 V
PaUP - PaGND
(A12-20 - A12-
12)
W - Y-R
Temperature control
switch signal (Passenger
side)Push passenger temperature
switch OFF.10 to 14 V
Symbols
(Terminal No.)Wiring
colorTerminal DescriptionConditionSpecification
PaUP - PaGND
(A12-20 - A12-W - Y-RTemperature control
switch signal (Passenger
Push passenger temperature Below 1.0 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

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

Fig. 24: Identifying Luggage Room J/B ECU Terminals
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
LUGGAGE ROOM J/B ECU TERMINALS SPECIFICATIONS
RFR1 - GND
(A46-15 - A46-
6)G-B -
W-BRear blower
motor signalDuring actuator check mode. Display code 0.10 to 14 V
RFR1 - GND
(A46-15 - A46-
6)G-B -
W-BRear blower
motor signalDisplay code 2.Below 1.0 V
RHR - GND
(A46-16 - A46-
6)G-O -
W-BRear blower
motor signalIgnition switch ON. Rear A/C manual mode.
Rear A/C blower motor does not operate.10 to 14 V
RHR - GND
(A46-16 - A46-
6)G-O -
W-BRear blower
motor signalIgnition switch ON. Rear A/C manual mode.
Rear A/C blower motor speed LO or HI.Below 1.0 V
RHR - GND
(A46-16 - A46-
6)G-O -
W-BRear blower
motor signalDuring actuator check mode. Display code 0.10 to 14 V
RHR - GND
(A46-16 - A46-
6)G-O -
W-BRear blower
motor signalDisplay code 2.Below 1.0 V
Symbols
(Terminal No.)Wiring
colorTerminal
DescriptionConditionSpecification
RMGV - Body
ground
(1) (L14-
11 - Body
ground)G -
Body
groundRear magnetic
valve operation
voltageIgnition switch ON. Rear A/C switch to
ON. Ignition switch ON. Rear A/C switch
to OFF.Below 1.0 V 10 to
14 V

Fig. 34: Diagnostic Trouble Code Information Chart
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
HINT:
*1 If the room temperature is approximately -20°C (-4°F) or lower, DTC B1411/11 may be output even
though the system is normal.
*2 If the ambient temperature is approximately -50°C (-58°F) or lower, a DTC may be output even
though the system is normal.
*3 If the check is being performed in a dark place, DTC B1421/21 (solar sensor circuit abnormal) could
be displayed. In this case, perform DTC check again while shining a light, such as inspection light, on the
solar sensor. If DTC B1421/21 is still displayed, there could be trouble in the solar sensor circuit.
*4 If the check is being performed in a dark place, DTC B1424/24 (solar sensor circuit abnormal) could
be displayed. In this case, perform DTC check again while shining a light, such as inspection light, on the
solar sensor. If DTC B1424/24 is still displayed, there could be trouble in the solar sensor circuit.
*5 If the check is being performed in a dark place, DTC B1421/21 (solar sensor circuit abnormal) could
be displayed. In this case, perform DTC check again while shining a light, such as inspection light, on the
solar sensor. If DTC B1421/21 is still displayed, there could be trouble in the solar sensor circuit.
CIRCUIT DESCRIPTION
This sensor detects the interior temperature that is used as the basis for temperature control and sends
appropriate signals to the A/C amplifier.
Fig. 35: DTC Detection Item Trouble Area Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM

Temperature Sensor)Thermistor)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
The sensor connected to the ECM detects fluctuations in the ambient temperature that is used for controlling the
interior temperature. The sensor sends a signal to the A/C amplifier via the ECM.
Fig. 41: DTC Detection Item Trouble Area Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM

OK: REPLACE ECM (SEE REPLACEMENT)
CIRCUIT DESCRIPTION
This sensor detects the evaporator temperature and sends the appropriate signals to the A/C amplifier. It is used
for frost prevention, temperature and time-lag air flow control.
Fig. 47: DTC Detection Item Trouble Area Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM
Fig. 48: Evaporator Temperature Sensor Circuit

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
INSPECTION PROCEDURE