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

DTC Code DTC Name
B14A2 Driver Side Solar Sensor Short Circuit

DESCRIPTION

A0119HRE01

The solar sensor (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 solar sensor (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 amplifier detects changes in the output voltage from the solar sensor (automatic light control sensor).

DTC No. DTC Detection Condition Trouble Area
B14A2 Short in driver side solar sensor circuit

  • Solar sensor (automatic light control sensor)

  • Harness and connector between solar sensor (automatic light control sensor) and air conditioning amplifier

  • Harness and connector between solar sensor (automatic light control sensor) and main body ECU

  • Main body ECU

  • Air conditioning amplifier

WIRING DIAGRAM

A0117BNE05

INSPECTION PROCEDURE

Tech Tips

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

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER (SOLAR 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)

      Driver side solar sensor /

      Min.: 0

      Max.: 255

      		 Driver side solar sensor value increases as brightness increases

      Open in circuit: 0

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

    B

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

    C

    REPLACE AIR CONDITIONING AMPLIFIER Click here

    A

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A011A48E16
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Solar Sensor (Automatic Light Control Sensor))

      Disconnect the T1 solar sensor (automatic light control sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T1-3 (CLTB) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      T1-6 (CLTE) - T1-3 (CLTB) Ignition switch off Below 1 V
      T1-6 (CLTE) - T1-3 (CLTB) Ignition switch ON 11 to 14 V

    4. Reconnect the solar sensor (automatic light control sensor) connector.


    NG

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

    OK

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


    1. A0117H6E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Solar Sensor (Automatic Light Control Sensor))
      *2

      Front view of wire harness connector

      (to Air Conditioning Amplifier)

      Disconnect the T1 solar sensor (automatic light control sensor) connector.

    2. Disconnect the G33 air conditioning amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D15-33 (TS) - T1-1 (TSD) Always Below 1 Ω
      D15-33 (TS) - Body ground Always 10 kΩ or higher

    4. Reconnect the solar sensor (automatic light control sensor) connector.

    5. Reconnect the air conditioning amplifier connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR)


    1. A011BHTE21
      Text in Illustration
      *1

      Component with harness connected

      (Solar Sensor (Automatic Light Control Sensor))

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

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      T1-1 (TSD) - T1-6 (CLTE) Sensor is subjected to electric light 0.8 to 4.3 V
      T1-1 (TSD) - T1-6 (CLTE) Sensor is covered with a 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 2 and the positive (+) lead to terminal 6 of the solar sensor.

      • While using the battery during inspection, 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 solar sensor.

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

    4. Reinstall the solar sensor (automatic light control sensor).


    NG

    REPLACE AUTOMATIC LIGHT CONTROL SENSOR Click here

    OK

    REPLACE AIR CONDITIONING AMPLIFIER Click here

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


    1. A0119T9E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU)
      *2

      Front view of wire harness connector

      (to Solar Sensor (Automatic Light Control Sensor))

      Disconnect the D42 main body ECU connector.

    2. Disconnect the T1 solar sensor (automatic light control sensor) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D42-20 (CLTB) - T1-3 (CLTB) Always Below 1 Ω
      D42-22 (CLTE) - T1-6 (CLTE) Always Below 1 Ω
      D42-20 (CLTB) - Body ground Always 10 kΩ or higher
      D42-22 (CLTE) - Body ground Always 10 kΩ or higher

    4. Reconnect the main body ECU connector.

    5. Reconnect the solar sensor (automatic light control sensor) connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU Click here