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AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System), Diagnostic DTC:B14A3

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DTC Code DTC Name
B14A3 Front Passenger Side Solar Sensor Short Circuit
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DESCRIPTION

The cooler thermistor (solar sensor), which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning in auto mode. The output current from the solar sensor varies according to the amount of sunlight. When the amount of sunlight increases, the output current increases. As the amount of sunlight decreases, the output current decreases. The air conditioning amplifier assembly detects the output current from the solar sensor.

DTC Code DTC Detection Condition Trouble Area
B14A3 An open or short in the passenger side solar sensor circuit.

  • Cooler thermistor (solar sensor)

  • Harness or connector

  • Air conditioning amplifier assembly
Tip:

If the check is performed in a dark place, DTC B14A2 or B14A3 (solar sensor circuit abnormal) may be stored even though the system is normal.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


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    READ VALUE USING INTELLIGENT TESTER (SOLAR SENSOR)


    1. Use the Data List to check if the solar sensor is functioning properly.

      Table 1. Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Solar Sensor (P Side) Solar sensor / Min.: 0, Max.: 255 Passenger side solar sensor voltage increases as brightness increases

      Open in the circuit: 0.

      Short in the circuit: 255.
      OK
      The display is as specified in the normal condition column.
      Table 2. Result
      Result Proceed to
      OK (When troubleshooting according to Problem Symptoms Table) A
      OK (When troubleshooting according to the DTC) B
      NG C

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    CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - AIR CONDITIONING AMPLIFIER)


    1. A01IR28E06

      Disconnect the I1 sensor connector.

    2. Disconnect the H46 amplifier connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Table 3. for LHD
      Tester Connection Condition Specified Condition
      H46-32 (TSP) - I1-2 (TSP) Always Below 1 Ω
      H46-31 (S5-4) - I1-1 (S5) Always Below 1 Ω
      H46-32 (TSP) - Body ground Always 10 kΩ or higher
      H46-31 (S5-4) - Body ground Always 10 kΩ or higher
      Table 4. for RHD
      Tester Connection Condition Specified Condition
      H46-32 (TSP) - I1-3 (TSP) Always Below 1 Ω
      H46-31 (S5-4) - I1-1 (S5) Always Below 1 Ω
      H46-32 (TSP) - Body ground Always 10 kΩ or higher
      H46-31 (S5-4) - Body ground Always 10 kΩ or higher
      Table 5. Text in Illustration
      *1 for LHD
      *2 for RHD
      *3

      Front view of wire harness connector

      (to Solar Sensor)
      *4

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

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    INSPECT COOLER THERMISTOR (SOLAR SENSOR)


    • *1: for LHD

    • *2: for RHD


    1. A01IPVUE06

      Remove the solar sensor (Click here).

    2. Measure the resistance of the sensor.


      1. Connect the positive (+) lead of the ohmmeter to terminal 1 and the negative (-) lead to terminal 2*1 or 3*2 of the solar sensor.

        Standard Resistance
        Table 6. for LHD
        Tester Connection Condition Specified Condition
        1 (S5) - 2 (TSP)

        • Vehicle indoors

        • Sensor exposed to electric light

        		 Below 1 Ω
        1 (S5) - 2 (TSP)

        • Vehicle indoors

        • Sensor covered with cloth

        		 10 kΩ or higher
        Table 7. for RHD
        Tester Connection Condition Specified Condition
        1 (S5) - 3 (TSP)

        • Vehicle indoors

        • Sensor exposed to electric light

        		 Below 1 Ω
        1 (S5) - 3 (TSP)

        • Vehicle indoors

        • Sensor covered with cloth

        		 10 kΩ or higher
        Table 8. Text in Illustration
        *1 for LHD
        *2 for RHD
        Note:

        The connection procedure for using a digital tester is shown above. When using an analog tester, connect the positive (+) lead to terminal 2*1 or 3*2 and the negative (-) lead to terminal 1 of the solar sensor.

        Tip:

        • As the inspection light is moved away from the sensor, the voltage decreases.

        • Use an incandescent light for the inspection. Position it about 30 cm (11.8 in.) from the solar sensor.


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    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLEClick here

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    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE COOLER THERMISTOR (SOLAR SENSOR)Click here

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    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here