Wiring diagram LEXUS LS430 2003 Factory Service Manual

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

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WIRING DIAGRAM
Fig. 48: Evaporator Temperature Sensor Circuit

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INSPECTION PROCEDURE

WIRING DIAGRAM
Fig. 55: Air Duct Sensor Circuit (Driver Side)

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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:
AIR CONDITIONER TEST RESULT
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
DUCT
TEMP-DDuct sensor (Driver side) / min.: -12.7°C
(9.14°F) max.: 76.55°C (169.79°F)Actual duct temperature is
displayed (Driver side)-

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
CIRCUIT DESCRIPTION
This sensor detects the register temperature and sends the appropriate signals to the A/C amplifier.
Fig. 59: DTC Detection Item Trouble Area Chart

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WIRING DIAGRAM
Fig. 60: Air Duct Sensor Circuit (Passenger Side)

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INSPECTION PROCEDURE
1.READ VALUE ON HAND-HELD TESTER

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
CIRCUIT DESCRIPTION
This sensor detects the exhaust gas (HC, CO) outside the vehicle and sends a signal to the A/C amplifier.
Fig. 64: DTC Detection Item Trouble Area Chart

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WIRING DIAGRAM

Fig. 70: DTC Detection Item Trouble Area Chart
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HINT:
If DTC B1244 is output at the same time, troubleshoot DTC B1244: LIGHT SENSOR CIRCUIT
MALFUNCTION .
WIRING DIAGRAM
Fig. 71: Solar Sensor Circuit (Passenger Side)

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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.

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NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
The pressure switch sends the appropriate signals to the A/C amplifier when the A/C refrigerant pressure drops
too low or rises too high.
When the A/C amplifier receives these signals, the compressor does not compress refrigerant.
Fig. 75: DTC Detection Item Trouble Area Chart

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WIRING DIAGRAM

Fig. 82: Photodiode Resistance/Solar Radiation Strength Graph
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DTC DETECTION ITEM TROUBLE AREA
HINT:
If DTC B1244 is output at the same time, troubleshoot DTC B1244: LIGHT SENSOR CIRCUIT
MALFUNCTION .
WIRING DIAGRAM
Fig. 83: Solar Sensor Circuit (Driver Side)

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INSPECTION PROCEDURE
1.READ VALUE ON HAND-HELD TESTER
DTC
No.Detection ItemTrouble Area
B1424Solar sensor circuit (Driver side) (Open
or short)
A/C solar sensor
Harness or connector between A/C solar sensor and
A/C amplifier
A/C amplifier

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Fig. 88: DTC Detection Item Trouble Area Chart

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WIRING DIAGRAM
Fig. 89: Rear Solar Sensor Circuit

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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 displa
y on the hand-held tester.

Fig. 94: DTC Detection Item Trouble Area Chart
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WIRING DIAGRAM
Fig. 95: Air Inlet Damper Position Sensor Circuit

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INSPECTION PROCEDURE
1.READ VALUE ON HAND-HELD TESTER

Fig. 99: TPBDR Terminal Voltage/Damper Opening Angle Graph
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Fig. 100: DTC Detection Item Trouble Area Chart

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WIRING DIAGRAM
Fig. 101: Max Cool Damper Position Sensor Circuit (Driver Side)

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