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AIR CONDITIONING SYSTEM, Diagnostic DTC:B14A2

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DTC Code DTC Name
B14A2 Driver Side Solar Sensor Short Circuit
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DESCRIPTION

The solar sensor (automatic light control sensor) is installed on the upper side of the instrument panel. It detects sunlight and creates a signal that is used for air conditioning control in 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 assembly 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 (automatic light control sensor) circuit

  • Solar sensor (automatic light control sensor)

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

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

  • Main body ECU (multiplex network body ECU)

  • Air conditioning amplifier assembly
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

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PROCEDURE


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    READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    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.

      Table 1. Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Solar Sensor (D Side)

      Driver side solar sensor (automatic light control sensor) /

      Min.: 0

      Max.: 255

      		 Driver side solar sensor (automatic light control sensor) value increases as brightness increases -
      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

  2. Click here

    CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. Disconnect the J1 solar sensor (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
      J1-6 (CLTB) - J1-3 (CLTE) Power switch off Below 1 V
      J1-6 (CLTB) - J1-3 (CLTE) Power switch on (IG) 11 to 14 V

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    CHECK HARNESS AND CONNECTOR (SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the H54 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H54-33 (TSD) - J1-1 (TSL)*1 Always Below 1 Ω
      H54-33 (TSD) - J1-2 (TSR)*2 Always Below 1 Ω
      H54-33 (TSD) - Body ground Always 10 kΩ or higher

      • *1: for LHD

      • *2: for RHD


    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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    INSPECT SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR)


    1. A0005G1E02

      Remove the solar sensor (automatic light control sensor) (Click here).

    2. Reconnect the J1 solar sensor (automatic light control sensor) connector.

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      J1-1 (TSL) - J1-3 (CLTE)*1 Sensor subjected to electric light 0.8 to 4.3 V
      J1-1 (TSL) - J1-3 (CLTE)*1 Sensor covered with cloth Below 0.8 V
      J1-2 (TSR) - J1-3 (CLTE)*2 Sensor subjected to electric light 0.8 to 4.3 V
      J1-2 (TSR) - J1-3 (CLTE)*2 Sensor covered with cloth Below 0.8 V

      • *1: for LHD

      • *2: for RHD

      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 (automatic light control sensor).

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


      • *1: for LHD

      • *2: for RHD

      Tip:

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

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

      Table 2. Text in Illustration
      *a

      Component with harness connected

      (Solar Sensor (Automatic Light Control Sensor))
      *b for LHD
      *c for RHD

    • OK

      REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)

    • NG

      REPLACE SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR) (Click here)

  5. Click here

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR))


    1. Disconnect the H10 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H10-20 (CLTB) - J1-6 (CLTB) Always Blow 1 Ω
      H10-22 (CLTE) - J1-3 (CLTE) Always Blow 1 Ω
      H10-20 (CLTB) - Body ground Always 10 kΩ or higher
      H10-22 (CLTE) - Body ground Always 10 kΩ or higher

    • OK

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

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR