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

DTC Code DTC Name
B14A2 Driver Side Solar Sensor Short Circuit

DESCRIPTION

A0097DAE01

The automatic light control sensor (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 automatic light control sensor (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 automatic light control sensor (solar sensor).

DTC Code DTC Detection Condition Trouble Area
B14A2 An open or short in the driver side solar sensor circuit.

  • Automatic light control sensor (solar sensor)

  • Harness or connector

  • Main body ECU (multiplex network body ECU)

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A009943E15

INSPECTION PROCEDURE

Tech Tips


  • If DTC B1244 is output together with other DTCs, troubleshoot DTC B1244 first Click here.

  • 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.

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (SOLAR SENSOR)


    1. Use the Data List to check if the automatic light control sensor (solar sensor) is functioning properly Click here.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Solar Sensor (D side) Automatic light control sensor (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.
      Result
      Result Proceed to
      OK (When troubleshooting according to problem symptoms table) A
      OK (When troubleshooting according to the DTC) B
      NG C

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

    CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) Click here

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A009BTOE64
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Automatic Light Control Sensor [Solar Sensor])

      Disconnect the H19 sensor connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H19-6 (CLTB) - H19-3 (CLTE) Ignition switch off Below 1 V
      H19-6 (CLTB) - H19-3 (CLTE) Ignition switch ON 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SOLAR SENSOR) Click here

    OK

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


    1. Disconnect the H19 sensor connector.

    2. Disconnect the G25 amplifier connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      H19-1 (TSL) - G25-33 (TSD) Always Below 1 Ω
      H19-1 (TSL) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      H19-2 (TSR) - G25-33 (TSD) Always Below 1 Ω
      H19-2 (TSR) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK AUTOMATIC LIGHT CONTROL SENSOR (SOLAR SENSOR)


    • *1: for LHD

    • *2: for RHD


    1. A0097E0E51
      Text in Illustration
      *A for LHD
      *B for RHD
      *a

      Component with harness connected

      (Automatic Light Control Sensor [Solar Sensor])

      Remove the automatic light control sensor (solar sensor) with its connector still connected Click here.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      H19-1 (TSL) - H19-3 (CLTE)

      Ignition switch ON

      Sensor subjected to electric light

      		 0.8 to 4.3 V
      H19-1 (TSL) - H19-3 (CLTE)

      Ignition switch ON

      Sensor covered with cloth

      		 Below 0.8 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      H19-2 (TSR) - H19-3 (CLTE)

      Ignition switch ON

      Sensor subjected to electric light

      		 0.8 to 4.3 V
      H19-2 (TSR) - H19-3 (CLTE)

      Ignition switch ON

      Sensor covered with cloth

      		 Below 0.8 V

      Note

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

      Tech Tips


      • Use an incandescent light for inspection. Bring it within about 30 cm (11.8 in.) of the solar sensor.

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


    NG

    REPLACE AUTOMATIC LIGHT CONTROL SENSOR (SOLAR SENSOR) Click here

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - SOLAR SENSOR)


    1. Disconnect the G64 ECU connector.

    2. Disconnect the H19 sensor connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G64-22 (CLTE) - H19-3 (CLTE) Always Below 1 Ω
      G64-20 (CLTB) - H19-6 (CLTB) Always Below 1 Ω
      G64-22 (CLTE) - Body ground Always 10 kΩ or higher
      G64-20 (CLTB) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here