2003 LEXUS LS430 air condition

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
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
A: Go to next step
2.INSPECT AIR CONDITIONING AMPLIFIER (TSDr)
a. Remove the A/C amplifier with connector still connected.
b. Turn the ignition switch to the ON position.
c. Measure the voltage according to the value (s) in the table below.
Standard:
AIR CONDITIONING AMPLIFIER (TSDR) VOLTAGE
HINT:
As the inspection light is moved away from the sensor, the voltage increases.
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
SOLAR SENS-
DSolar sensor (Driver side) / min.: 0 max.:
255Increases as brightness
increases-
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A11-19 (TSDr) - Body groundSensor is subjected to electric light4.0 to 4.6 V
A11-19 (TSDr) - Body groundSensor is covered by a clothBelow 0.8 V

Use an incandescent lamp for inspection. Bring it within 30 cm (11.8 in.) of the A/C solar sensor.
Result:
AIR CONDITIONING AMPLIFIER (TSDR) TEST RESULT
Fig. 84: Inspecting Air Conditioning Amplifier (TSDR)

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
A: Go to next step
3.INSPECT A/C SOLAR SENSOR
a. Remove the A/C solar sensor.
NGA
OK (Checking from the PROBLEM SYMPTOMS TABLE)B
OK (Checking from the DTC)C

Fig. 85: Inspecting A/C Solar Sensor
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NG: REPLACE A/C SOLAR SENSOR
OK: Go to next step
4.CHECK HARNESS AND CONNECTOR (A/C SOLAR SENSOR - AIR CONDITONING
AMPLIFIER) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance according to the value (s) in the table below.
Standard:
A/C SOLAR SENSOR - AIR CONDITONING AMPLIFIER RESISTANCE
Tester connectionConditionSpecified condition
A11-19 (TSDr) - A28-1 (TSL)AlwaysBelow 1 ohms
A11-19 (TSDr) - Body groundAlways10 kohms or higher

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
A photodiode in the A/C solar sensor detects solar radiation and sends signals to the A/C amplifier.
Fig. 87: Photodiode Resistance/Solar Radiation Strength Graph

DATA LIST / AIR CONDITIONER:
DATA LIST / AIR CONDITIONER
OK:
The display is as specified in the normal condition.
Result:
AIR CONDITIONER TEST RESULT
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
A: Go to next step
2.INSPECT AIR CONDITIONING AMPLIFIER (TSRr - GND)
a. Remove the A/C amplifier with connector still connected.
b. Turn the ignition switch to the ON position.
c. Measure the voltage according to the value (s) in the table below.
Standard:
AIR CONDITIONING AMPLIFIER (TSRR - GND) VOLTAGE
HINT:
As the temperature increases, the voltage decreases.
Use an incandescent lamp for inspection. Bring it within 30 cm (11.8 in.) of the solar sensor.
Result:
ItemMeasure Item/Display (Range)Normal ConditionDiagnostic
Note
REAR SOLAR
SENSRear solar sensor / min.: 0 max.:
255Changes depending on
brightness-
NGA
OK (Checking from the PROBLEM SYMPTOM TABLE)B
OK (Checking from the DTC)C
Tester connectionConditionSpecified condition
A11-30 (TSRr) - A12-16 (S5-4)Sensor is subjected to electric light0.8 to 4.3 V
A11-30 (TSRr) - A12-16 (S5-4)Sensor is covered by a clothBelow 0.8 V

AIR CONDITIONING AMPLIFIER (TSRR - GND) TEST RESULT
Fig. 90: Inspecting Air Conditioning Amplifier (TSRR
- GND)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
C: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT )
A: Go to next step
3.INSPECT A/C SOLAR SENSOR
a. Remove the A/C solar sensor.
b. Measure the resistance according to the value (s) in the table below.
c. Connect the positive (+) lead from the ohmmeter to terminal 1 and negative (-) lead to terminal 2 of
the A/C solar sensor.
NGA
OK (Checking from the PROBLEM SYMPTOMS TABLE)B
OK (Checking from the DTC)C

OK: Go to next step
4.CHECK HARNESS AND CONNECTOR (A/C SOLAR SENSOR - AIR CONDITONING
AMPLIFIER)
a. Measure the resistance according to the value (s) in the table below.
Standard:
A/C SOLAR SENSOR - AIR CONDITONING AMPLIFIER RESISTANCE
Tester connectionConditionSpecified condition
A11-30 (TSRr) - A29-2AlwaysBelow 1 ohms
A12-16 (S5-4) - A29-1AlwaysBelow 1 ohms
A11-30 (TSRr) - Body groundAlways10 kohms or higher
A12-16 (S5-4) - Body groundAlways10 kohms or higher

Fig. 92: Checking Harness And Connector (A/C Solar Sensor -Air Conditoning Amplifier)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR
OK: REPLACE AIR CONDITIONING AMPLIFIER (SEE REPLACEMENT
)
CIRCUIT DESCRIPTION
This sensor detects the position of the air inlet servomotor and sends the appropriate signals to the A/C
amplifier. The position sensor is built in the air inlet servomotor.
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Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.