AIR CONDITIONING SYSTEM, Diagnostic DTC:B14A3

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

DESCRIPTION

A019ORWE01

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

  • Main body ECU

  • A/C amplifier

WIRING DIAGRAM

A019NI9E25

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


    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the intelligent tester on.

    4. Enter the following menus: Body / 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. A019MRIE37
      *1

      Front view of wire harness connector

      (to Solar Sensor)

      Disconnect the solar sensor connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H3-6 (CLTB) - H3-3 (CLTE) Engine switch off Below 1 V
      H3-6 (CLTB) - H3-3 (CLTE) Engine switch on (IG) 11 to 14 V

    NG

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

    OK

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


    1. A019MRIE38

      Disconnect the solar sensor connector.

    2. A019KZNE01

      Disconnect the A/C amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F50-32 (TSP) - H3-2 (TSR)*1 Always Below 1 Ω
      F50-32 (TSP) - H3-1 (TSL)*2 Always Below 1 Ω
      F50-32 (TSP) - Body ground Always 10 kΩ or higher

      • *1: for LHD

      • *2: for RHD

      Text in Illustration
      *1

      Front view of wire harness connector

      (to Solar Sensor)
      *2

      Front view of wire harness connector

      (to A/C Amplifier)
      *3 for LHD
      *4 for RHD

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT SOLAR SENSOR


    1. A019LJ5E29
      Text in Illustration
      *1

      Component with harness connected

      (Solar Sensor)
      *2 for LHD
      *3 for RHD

      Remove the solar sensor.

    2. Reconnect the solar sensor connector.

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H3-2 (TSR) - H3-3 (CLTE)*1 Sensor is exposed to electric light 0.8 to 4.3 V
      H3-2 (TSR) - H3-3 (CLTE)*1 Sensor is covered with a cloth Below 0.8 V
      H3-1 (TSL) - H3-3 (CLTE)*2 Sensor is exposed to electric light 0.8 to 4.3 V
      H3-1 (TSL) - H3-3 (CLTE)*2 Sensor is covered with a 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 a negative (-) lead to terminal 1*1 (2*2) and a 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 - SOLAR SENSOR)


    1. A019O3OE06

      Disconnect the main body ECU connector.

    2. A019MRIE39
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU)
      *2

      Front view of wire harness connector

      (to Solar Sensor)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F13-20 (CLTB) - H3-6 (CLTB) Always Below 1 Ω
      F13-22 (CLTE) - H3-3 (CLTE) Always Below 1 Ω
      F13-20 (CLTB) - Body ground Always 10 kΩ or higher
      F13-22 (CLTE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE MAIN BODY ECU Click here