AIR CONDITIONING SYSTEM, Diagnostic DTC:B14A2

DTC Code DTC Name
B14A2 Driver Side Solar Sensor Short Circuit

DESCRIPTION

A005EWYE55

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 amount of 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

WIRING DIAGRAM

A005BLLE04
*a Main Body ECU (Multiplex Network Body ECU)
*b NSHA
*c Solar Sensor (Automatic Light Control Sensor)
*d Air Conditioning Amplifier Assembly

CAUTION / NOTICE / HINT

Tech Tips

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

PROCEDURE


  1. 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.

      Air Conditioner
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Solar Sensor (D side)

      Solar sensor (automatic light control sensor) /

      Min.: 0

      Max.: 255

      		 Solar 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

    B

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

    C

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

  2. CHECK MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) (POWER SOURCE CIRCUIT)


    1. A005A0SE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Solar Sensor (Automatic Light Control Sensor))

      Disconnect the I1 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
      I1-3 (CLTB) - I1-6 (CLTE) Power switch off Below 1 V
      I1-3 (CLTB) - I1-6 (CLTE) Power switch on (IG) 11 to 14 V

    NG

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

    OK

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


    1. Disconnect the L17 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
      L17-33 (TS) - I1-1 (NSHA) Always Below 1 Ω
      L17-33 (TS) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR)


    1. A005EJGE02
      Text in Illustration
      *a

      Component with harness connected

      (Solar Sensor (Automatic Light Control Sensor))

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

    2. Reconnect the I1 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
      I1-1 (NSHA) - I1-6 (CLTE) Sensor is exposed to electric light 0.8 to 4.3 V
      I1-1 (NSHA) - I1-6 (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 positive (+) lead to terminal 6 and the negative (-) lead to terminal 1 of the solar sensor (automatic light control sensor).

      • While using the auxiliary 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 (automatic light control sensor).

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


    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPLACE SOLAR SENSOR (AUTOMATIC LIGHT CONTROL SENSOR) Click here

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


    1. Disconnect the L7 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
      L7-20 (CLTB) - I1-3 (CLTB) Always Blow 1 Ω
      L7-22 (CLTE) - I1-6 (CLTE) Always Blow 1 Ω
      L7-20 (CLTB) - Body ground Always 10 kΩ or higher
      L7-22 (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