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

DTC Code DTC Name
B14A2 Driver Side Solar Sensor Short Circuit

DESCRIPTION

A005KZDE18

The automatic light control 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 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.

DTC No. DTC Detection Condition Trouble Area
B14A2 An short in the driver side solar sensor circuit.

  • Automatic light control sensor

  • Harness or connector

  • Main body ECU (multiplex network body ECU)

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A005K53E36
*a MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)
*b AUTOMATIC LIGHT CONTROL SENSOR
*c AIR CONDITIONING AMPLIFIER ASSEMBLY

CAUTION / NOTICE / HINT

Tech Tips


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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (AUTOMATIC LIGHT CONTROL SENSOR)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / Air Conditioner / Data List.

    5. According to the display on the intelligent tester, read the Data List.

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

    B

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

    C

    CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - AIR CONDITIONING AMPLIFIER) Click here

    A

  2. CHECK FOR DTC


    OK

    END

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  3. CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - AIR CONDITIONING AMPLIFIER)


    1. Disconnect the F42 air conditioning amplifier assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F42-33 (TSD) - F73-1 (TSD) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F42-33 (TSD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK AUTOMATIC LIGHT CONTROL SENSOR

    A005I92E01
    Text in Illustration
    *a

    Component with harness connected

    (Automatic Light Control Sensor)

    1. Remove the F73 automatic light control sensor with its connector still connected Click here.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F73-1 (TSD) - F73-5 (CLTE)

      Ignition switch ON

      Sensor subjected to electric light

      		 0.8 to 4.3 V
      F73-1 (TSD) - F73-5 (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 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 Click here

    OK

  5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - AUTOMATIC LIGHT CONTROL SENSOR)


    1. Disconnect the F76 Main body ECU (multiplex network body ECU) connector.

    2. Disconnect the F73 Automatic light control sensor connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F76-20 (CLTB) - F73-3 (CLTB) Always Below 1 Ω
      F76-22 (CLTE) - F73-5 (CLTE) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F76-20 (CLTB) - Body ground Always 10 kΩ or higher
      F76-22 (CLTE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    A005GSAE03
    Text in Illustration
    *a

    Component with harness connected

    (Main Body ECU (Multiplex Network Body ECU))

    1. Connect the F76 Main body ECU (multiplex network body ECU) connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F76-20 (CLTB) - F76-22 (CLTE) Ignition switch ON 11 to 14 V

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

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