AIR CONDITIONING SYSTEM, Diagnostic DTC:B14A3

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

DESCRIPTION

A003VX1E01

The automatic light control sensor (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 automatic light control sensor (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 air conditioning amplifier assembly detects changes in the output voltage from the automatic light control sensor (solar sensor).

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

  • Automatic light control sensor (solar sensor)

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

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

  • Main body ECU (multiplex network body ECU)

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A003Y9WE50

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 power 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)

      Front passenger side solar sensor /

      Min.: 0

      Max.: 255

      		 Front 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 AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A003Y0DE06
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Automatic Light Control Sensor (Solar Sensor))

      Disconnect the I1 automatic light control sensor (solar sensor) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I1-6 (CLTB) - I1-3 (CLTE) Power switch off Below 1 V
      I1-6 (CLTB) - I1-3 (CLTE) Power switch on (IG) 11 to 14 V

    NG

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

    OK

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


    1. Disconnect the H85 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
      H85-32 (TSP) - I1-2 (TSR)*1 Always Below 1 Ω
      H85-32 (TSP) - I1-1 (TSL)*2 Always Below 1 Ω
      H85-32 (TSP) - Body ground Always 10 kΩ or higher

      • *1: for LHD

      • *2: for RHD


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT AUTOMATIC LIGHT CONTROL SENSOR


    1. A003ZBZE10
      Text in Illustration
      *A for LHD
      *B for RHD
      *a

      Component with harness connected

      (Automatic Light Control Sensor (Solar Sensor))

      Remove the automatic light control sensor (solar sensor).

    2. Reconnect the I1 automatic light control sensor (solar 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
      I1-2 (TSR) - I1-3 (CLTE)*1 Sensor is exposed to electric light 0.8 to 4.3 V
      I1-2 (TSR) - I1-3 (CLTE)*1 Sensor is covered with a cloth Below 0.8 V
      I1-1 (TSL) - I1-3 (CLTE)*2 Sensor is exposed to electric light 0.8 to 4.3 V
      I1-1 (TSL) - I1-3 (CLTE)*2 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*2, 2*1 and the positive (+) lead to terminal 3 of the automatic light control sensor (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 automatic light control sensor (solar sensor).

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


      • *1: for LHD

      • *2: for RHD


    NG

    REPLACE AUTOMATIC LIGHT CONTROL SENSOR Click here

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

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


    1. Disconnect the H16 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
      H16-20 (CLTB) - I1-6 (CLTB) Always Below 1 Ω
      H16-22 (CLTE) - I1-3 (CLTE) Always Below 1 Ω
      H16-20 (CLTB) - Body ground Always 10 kΩ or higher
      H16-22 (CLTE) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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