AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B14A2

DTC Code DTC Name
B14A2 Driver Side Solar Sensor Short Circuit

DESCRIPTION

E132508E33

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

B14A2

An open or short in the driver 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.

WIRING DIAGRAM

E179531E18
E179531E19

PROCEDURE

  1. READ VALUE USING INTELLIGENT TESTER

    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 (D Side)

      Solar sensor / Min.: 0, Max.: 255

      Driver 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

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    (Click here)

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    (Click here)

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

    1. except 1WW:

      1. Disconnect the I1 sensor connector.

        E354498E01

      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

        H46-33 (TSD) - I1-3 (TSD)

        Always

        Below 1 Ω

        H46-31 (S5-4) - I1-1 (S5)

        Always

        Below 1 Ω

        H46-33 (TSD) - 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

        H46-33 (TSD) - I1-2 (TSD)

        Always

        Below 1 Ω

        H46-31 (S5-4) - I1-1 (S5)

        Always

        Below 1 Ω

        H46-33 (TSD) - 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)

    2. for 1WW:

      1. U124112E02

        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 6. for LHD

        Tester Connection

        Condition

        Specified Condition

        H46-33 (TSD) - I1-3 (TSD)

        Always

        Below 1 Ω

        H46-30 (S5-1) - I1-1 (S5)

        Always

        Below 1 Ω

        H46-33 (TSD) - Body ground

        Always

        10 kΩ or higher

        H46-30 (S5-1) - Body ground

        Always

        10 kΩ or higher
        Table 7. for RHD

        Tester Connection

        Condition

        Specified Condition

        H46-33 (TSD) - I1-2 (TSD)

        Always

        Below 1 Ω

        H46-30 (S5-1) - I1-1 (S5)

        Always

        Below 1 Ω

        H46-33 (TSD) - Body ground

        Always

        10 kΩ or higher

        H46-30 (S5-1) - Body ground

        Always

        10 kΩ or higher
        Table 8. 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)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. INSPECT COOLER THERMISTOR (SOLAR SENSOR)

    • *1: for LHD

    • *2: for RHD

    1. E179533E10

      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*2 or 3*1 of the solar sensor.

        Standard Resistance

        Table 9. for LHD

        Tester Connection

        Condition

        Specified Condition

        1 (S5) - 3 (TSD)

        • Vehicle indoors

        • Sensor exposed to electric light

        Below 1 Ω

        1 (S5) - 3 (TSD)

        • Vehicle indoors

        • Sensor covered with cloth

        10 kΩ or higher
        Table 10. for RHD

        Tester Connection

        Condition

        Specified Condition

        1 (S5) - 2 (TSD)

        • Vehicle indoors

        • Sensor exposed to electric light

        Below 1 Ω

        1 (S5) - 2 (TSD)

        • Vehicle indoors

        • Sensor covered with cloth

        10 kΩ or higher
        Table 11. 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 3*1 or 2*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.

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    (Click here)

    REPLACE COOLER THERMISTOR (SOLAR SENSOR)

    (Click here)