LEXUS LS430 2003 Factory Repair Manual

b. Apply battery voltage between terminals A28-6 (CLTB) and A28-3 (CLTE) of the A/C solar
sensor.
c. Measure the voltage according to the value (s) in the table below.
Standard:
A/C SOLAR SENSOR VOLTAGE
HINT:
As the inspection light is moved away from the sensor, the voltage increases.
Use an incandescent lamp for inspection. Bring it within 30 cm (11.8 in.) of the solar sensor.
Tester connectionConditionSpecified condition
A28-1 (TSL) - A28-3 (CLTE)Sensor is subjected to electric light4.0 to 4.6 V
A28-1 (TSL) - A28-3 (CLTE)Sensor is covered by a clothBelow 0.8 V

Fig. 85: Inspecting A/C Solar Sensor
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
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

Fig. 86: 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
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

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
Fig. 88: DTC Detection Item Trouble Area Chart

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
WIRING DIAGRAM
Fig. 89: Rear Solar 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 displa
y 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 (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

Standard:
A/C SOLAR SENSOR RESISTANCE
HINT:
As the inspection light is moved away from the sensor, the voltage increases.
Use an incandescent lamp for inspection. Bring it within 30 cm (11.8 in.) of the solar sensor.
Fig. 91: Inspecting A/C Solar Sensor

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
NG: REPLACE A/C SOLAR SENSOR
Tester connectionConditionSpecified condition
A29-1 - A29-2Sensor is subjected to electric lightExcept infin ohms
A29-1 - A29-2Sensor is covered by a clothinfin ohms (No continuity)

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