AIR CONDITIONING SYSTEM, Diagnostic DTC:B14A3

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

DESCRIPTION

E132508E05

The automatic light control sensor (solar sensor), which is installed on the upper side of the instrument panel, detects sunlight and controls the air conditioning in auto mode. The output current from the solar sensor varies according to the amount of sunlight. When the amount of sunlight increases, the output current increases. As the amount of sunlight decreases, the output current decreases. The air conditioning amplifier assembly detects the output current from the solar sensor.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

Memory

Note

B14A3

Front Passenger Side Solar Sensor Short Circuit

An open or short in the passenger side solar sensor circuit.

  • Automatic light control sensor (solar sensor)

  • Harness or connector

  • Main body ECU (multiplex network body ECU)

  • Air conditioning amplifier assembly

Stored

(4 seconds or more)

If the check is performed in a dark place, DTC B14A2 (driver side solar sensor short circuit) may also be stored.

WIRING DIAGRAM

E196914E22

CAUTION / NOTICE / HINT

Tip:

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

  • If the check is performed in a dark place, DTC B14A2 or B14A3 (solar sensor circuit abnormal) may be stored even though the system is normal.

PROCEDURE

  1. READ VALUE USING INTELLIGENT TESTER (SOLAR SENSOR)

    1. Use the Data List to check if the automatic light control sensor (solar sensor) is functioning properly

      Click here

      Body Electrical > Air Conditioner > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Solar Sensor (P Side)

      Automatic light control sensor (solar sensor)

      Min.: 0, Max.: 255

      Passenger side solar sensor voltage increases as brightness increases

      Open in the circuit: 0.

      Short in the circuit: 255.

      OK

      The display is as specified in the normal condition column.

    Result

    Result

    Proceed to

    OK (When troubleshooting according to problem symptoms table)

    A

    OK (When troubleshooting according to the DTC)

    B

    NG

    C
    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here

    C

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    1. E152686C02

      *a

      Front view of wire harness connector

      (to Automatic Light Control Sensor [Solar Sensor])

      Disconnect the H19 sensor connector.

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      H19-6 (CLTB) - H19-3 (CLTE)

      Engine switch off

      Below 1 V

      H19-6 (CLTB) - H19-3 (CLTE)

      Engine switch on (IG)

      11 to 14 V

    Result

    Result

    OK

    NG
    NG

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

    OK

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

    1. Disconnect the H19 sensor connector.

    2. Disconnect the G13 amplifier connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      H19-2 (TSR) - G13-32 (TSP)

      Always

      Below 1 Ω

      H19-2 (TSR) - Body ground

      Always

      10 kΩ or higher

    Result

    Result

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK AUTOMATIC LIGHT CONTROL SENSOR (SOLAR SENSOR)

    1. E161710C03

      *a

      Component with harness connected

      (Automatic Light Control Sensor [Solar Sensor])

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

      Click here

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      H19-2 (TSR) - H19-3 (CLTE)

      Engine switch on (IG)Sensor subjected to electric light

      0.8 to 4.3 V

      H19-2 (TSR) - H19-3 (CLTE)

      Engine switch on (IG)Sensor covered with 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 3 of the solar sensor.

      Tip:

      • 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.

    Result

    Result

    OK

    NG
    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY

    Click here

    NG

    REPLACE AUTOMATIC LIGHT CONTROL SENSOR (SOLAR SENSOR)

    Click here

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

    1. Disconnect the G47 ECU connector.

    2. Disconnect the H19 sensor connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      G47-22 (CLTE) - H19-3 (CLTE)

      Always

      Below 1 Ω

      G47-20 (CLTB) - H19-6 (CLTB)

      Always

      Below 1 Ω

      G47-22 (CLTE) - Body ground

      Always

      10 kΩ or higher

      G47-20 (CLTB) - Body ground

      Always

      10 kΩ or higher

    Result

    Result

    OK

    NG
    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR