AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B14A1/25, B14A2/-25

DTC Code DTC Name
B14A1/25 Open in Solar Sensor Circuit
B14A2/-25 Short in Solar Sensor Circuit

DESCRIPTION

A004I9AE54

The automatic light control sensor is installed on the upper side of the instrument panel. It detects sunlight to control air conditioning AUTO mode. The output voltage from the automatic light control sensor varies in accordance with the amount of sunlight. When the sunlight increases, the output voltage increases. As the sunlight decreases, the output voltage decreases. The air conditioning control assembly detects changes in the output voltage from the automatic light control sensor.

DTC No. DTC Detection Condition Trouble Area
B14A1/25 Open in Solar Sensor Circuit

  • Automatic light control sensor

  • Harness or connector between automatic light control sensor and air conditioning control assembly

  • Harness or connector between automatic light control sensor and main body ECU (network gateway body ECU)

  • Main body ECU (network gateway body ECU)

  • Air conditioning control assembly
B14A2/-25 Short in Solar Sensor Circuit

  • Automatic light control sensor

  • Harness or connector between automatic light control sensor and air conditioning control assembly

  • Harness or connector between automatic light control sensor and main body ECU (network gateway body ECU)

  • Main body ECU (network gateway body ECU)

  • Air conditioning control assembly

WIRING DIAGRAM

A004H4LE02
*a Main Body ECU (Network Gateway ECU)
*b Automatic Light Control Sensor
*c Air Conditioning Control Assembly

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

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

    5. Check the value(s) by referring to the table below.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Solar Sensor

      Solar sensor /

      Min.: 0W/m2

      Max.: 4448W/m2

      		Solar sensor value increases as brightness increases -
      OK
      The display is as specified in the Normal Condition column.
      Result
      Result Proceed to
      OK (When troubleshooting according to the DTC) A
      OK (When troubleshooting according to Problem Symptoms Table) B
      NG C

    B

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

    C

    CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) Click here

    A

  2. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check the DTCs Click here.

      OK
      DTC is not output.

    OK

    END

    NG

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A004KNXE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Automatic Light Control Sensor)

      Disconnect the D45 solar automatic light control sensor connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D45-6(CLTE) - D45-3(CLTB) Ignition switch off Below 1 V
      D45-6(CLTE) - D45-3(CLTB) Ignition switch ON 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (NETWORK GATEWAY ECU) - AUTOMATIC LIGHT CONTROL SENSOR) Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (AUTOMATIC LIGHT CONTROL SENSOR - AIR CONDITIONING CONTROL ASSEMBLY)


    1. Disconnect the D45 automatic light control sensor connector.

    2. Disconnect the D20 air conditioning control assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D20-2(CLTS) - D45-1(TSD) Always Below 1 Ω
      D20-2(CLTS) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. INSPECT AUTOMATIC LIGHT CONTROL SENSOR


    1. A004IKLE02

      Remove the automatic light control sensor Click here.

    2. Reconnect the D45 automatic light control sensor connector.

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D45-1(TSD) - D45-3(CLTB) Sensor is subjected to electric light 0.8 to 4.3 V
      D45-1(TSD) - D45-3(CLTB) Sensor is covered with a cloth Below 0.8 V
      Text in Illustration
      *a

      Component with harness connected

      (Automatic Light Control Sensor)

      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 2 and the positive (+) lead to terminal 6 of the automatic light control sensor.

      • Do not bring the positive and negative tester probes too close to each other as a short circuit may occur.

      Tech Tips


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

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


    OK

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

    NG

    REPLACE AUTOMATIC LIGHT CONTROL SENSOR Click here

  6. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (NETWORK GATEWAY ECU) - AUTOMATIC LIGHT CONTROL SENSOR)


    1. Disconnect the D6 main body ECU (network gateway ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D6-13(CLTE) - D45-6(CLTE) Always Blow 1 Ω
      D6-15(CLTB) - D45-3(CLTB) Always Blow 1 Ω
      D6-13(CLTE) - Body ground Always 10 kΩ or higher
      D6-15(CLTB) - Body ground Always 10 kΩ or higher

    OK

    REPLACE MAIN BODY ECU (NETWORK GATEWAY ECU)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR