AIR CONDITIONING SYSTEM, Diagnostic DTC:B14A3

DTC Code DTC Name
B14A3 Front Passenger Side Solar Sensor Short Circuit

DESCRIPTION

A01EKQOE01

The solar 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 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 A/C amplifier detects changes in the output voltage from the solar sensor.

DTC No. DTC Detection Condition Trouble Area
B14A3 Short in passenger side solar sensor circuit

  • Solar sensor

  • Harness or connector between solar sensor and A/C amplifier

  • Harness or connector between solar sensor and main body ECU (driver side junction block)

  • Main body ECU (driver side junction block)

  • A/C amplifier

WIRING DIAGRAM

A01EKHWE59

INSPECTION PROCEDURE

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 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 (P Side)

      Passenger side solar sensor /

      Min.: 0

      Max.: 255

      		 Passenger side 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 A/C AMPLIFIER Click here

    A

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A01EIONE19
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Solar Sensor)

      Disconnect the F4 solar sensor connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F4-6 (CLTB) - F4-3 (CLTE) Ignition switch off Below 1 V
      F4-6 (CLTB) - F4-3 (CLTE) Ignition switch ON 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) - SOLAR SENSOR) Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (SOLAR SENSOR - A/C AMPLIFIER)


    1. Disconnect the D47 A/C amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D47-32 (TSP) - F4-2 (TSR) Always Below 1 Ω
      D47-32 (TSP) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT SOLAR SENSOR


    1. A01EIYAE19
      Text in Illustration
      *1

      Component with harness connected

      (Solar Sensor)

      Remove the solar sensor.

    2. Reconnect the F4 solar 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
      F4-2 (TSR) - F4-3 (CLTE) Sensor is subjected to electric light 0.8 to 4.3 V
      F4-2 (TSR) - F4-3 (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 1 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.


    NG

    REPLACE SOLAR SENSOR Click here

    OK

    REPLACE A/C AMPLIFIER Click here

  5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) - SOLAR SENSOR)


    1. Disconnect the D49 main body ECU (driver side junction block assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D49-20 (CLTB) - F4-6 (CLTB) Always Below 1 Ω
      D49-18 (CLTE) - F4-3 (CLTE) Always Below 1 Ω
      D49-20 (CLTB) - Body ground Always 10 kΩ or higher
      D49-18 (CLTE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Click here