2003 LEXUS LS430 sensor

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NG: Go to STEP 3
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS
TABLE
3.INSPECT A/C PRESSURE SENSOR
a. Disconnect the A/C pressure sensor connector.
b. Install the manifold gauge set (see ON
-VEHICLE INSPECTION ).
c. Connect the positive (+) lead from the three 1.5 V dry cell batteries to terminal 3 and negative (-)
lead to terminal1.
d. Check voltage between terminals 2 and 1 of A/C pressure sensor.
OK:
The voltage depends on the refrigerant pressure as shown in the chart.

Fig. 80: Inspecting A/C Pressure Sensor
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

NG: REPLACE A/C PRESSURE SENSOR
OK: Go to next step
4.CHECK HARNESS AND CONNECTOR (A/C PRESSURE SENSOR - AIR CONDITIONING
AMPLIFIER) (SEE ELECTRONIC CIRCUIT INSPECTION PROCEDURE
)
a. Measure the resistance according to the value (s) in the table below.
Standard:
A/C PRESSURE SENSOR - AIR CONDITIONING AMPLIFIER RESISTANCE
Tester connectionConditionSpecified condition
A3-2 - A12-17 (PRS)AlwaysBelow 1 ohms
A3-3 - A12-15 (S5-2)AlwaysBelow 1 ohms
A3-1 - A13-12 (SG-5)AlwaysBelow 1 ohms
A12-17 (PRS) - Body groundAlways10 kohms or higher
A12-15 (S5-2) - Body groundAlways10 kohms or higher
A13-12 (SG-5) - Body groundAlways10 kohms or higher

Fig. 81: Checking Harness And Connector (A/C Pressure Sensor -Air Conditioning 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. 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

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

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