AIR CONDITIONING SYSTEM, Diagnostic DTC:B14A2

DTC Code DTC Name
B14A2 Driver Side Solar Sensor Short Circuit

DESCRIPTION

A01UZ3NE27

The automatic light control sensor*1 or cooler thermistor (solar sensor)*2, 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 automatic light control sensor*1 or cooler thermistor (solar sensor)*2 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 automatic light control sensor*1 or cooler thermistor (solar sensor)*2.

DTC No. DTC Detection Condition Trouble Area
B14A2 A short in the driver side solar sensor circuit.

  • Automatic light control sensor*1

  • Cooler thermistor (solar sensor)*2

  • Harness or connector between automatic light control sensor and air conditioning amplifier assembly*1

  • Harness or connector between automatic light control sensor and main body ECU*1

  • Harness or connector between cooler thermistor (solar sensor) and air conditioning amplifier assembly*2

  • Main body ECU*1

  • Air conditioning amplifier assembly

WIRING DIAGRAM

A01UXMPE03
w/ Automatic Light Control System
*a Main Body ECU
*b Automatic Light Control Sensor
*c Air Conditioning Amplifier Assembly
A01UXH7E01
w/o Automatic Light Control System
*a Cooler Thermistor (Solar Sensor)
*b 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 ignition switch to ON (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Data List.

    5. According to the display on the GTS, read the Data List.

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

      Driver side solar sensor /

      Min.: 0

      Max.: 255

      		 Driver side solar sensor value increases as brightness increases -
      OK
      The display is as specified in the normal condition column.
      Result
      Result Proceed to
      OK (When troubleshooting according to the DTC) A
      OK (When troubleshooting according to Problem Symptoms Table) B
      NG*1 C
      NG*2 D

      • *1: w/ Automatic Light Control System

      • *2: w/o Automatic Light Control System


    B

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

    C

    CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) Click here

    D

    CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    A

  2. CHECK FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      OK
      DTC B14A2 is not output

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

    A01V0KRE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Automatic Light Control Sensor)

    1. Disconnect the automatic light control sensor connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F53-3 (CLTB) - F53-5 (CLTE) Ignition switch off Below 1 V
      F53-3 (CLTB) - F53-5 (CLTE) Ignition Switch ON (IG) 11 to 14 V

    NG

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

    OK

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


    1. Disconnect the F53 automatic light control sensor connector.

    2. Disconnect the F29 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F53-1 (TSD) - F29-33 (TSD) Always Below 1 Ω
      F53-1 (TSD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK AUTOMATIC LIGHT CONTROL SENSOR

    A01V21AE01
    Text in Illustration
    *a

    Component with harness connected

    (Automatic Light Control Sensor)

    1. Remove the automatic light control sensor Click here.

    2. Reconnect the automatic light control sensor connector.

    3. Reconnect the air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F53-1 (TSD) - F53-5 (CLTE)

      Ignition Switch ON (IG)

      Sensor subjected to electric light

      		 0.8 to 4.3 V
      F53-1 (TSD) - F53-5 (CLTE)

      Ignition 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 5 and the positive (+) lead to terminal 1 of the automatic light control sensor.

      Tech Tips


      • Use an incandescent light for inspection. Bring it within about 30 cm (11.8 in.) of the 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 AUTOMATIC LIGHT CONTROL SENSOR Click here

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


    1. Disconnect the F53 automatic light control sensor connector.

    2. Disconnect the F57 main body ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F53-3 (CLTB) - F57-20 (CLTB) Always Below 1 Ω
      F53-5 (CLTE) - F57-22 (CLTE) Always Below 1 Ω
      F53-3 (CLTB) - Body ground Always 10 kΩ or higher
      F53-5 (CLTE) - Body ground Always 10 kΩ or higher

    OK

    REPLACE MAIN BODY ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A01UYKIE02
      Text in Illustration
      *a

      Component with harness connected

      (Air Conditioning Amplifier Assembly)

      Remove the air conditioning amplifier assembly with its connectors 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
      F29-30 (S5-4) - Body ground Ignition Switch ON (IG) 4.5 to 5.5 V

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  8. CHECK HARNESS AND CONNECTOR (COOLER THERMISTOR (SOLAR SENSOR) - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the F54 cooler thermistor (solar sensor) connector.

    2. Disconnect the F29 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F54-1 (SS+) - F29-30 (S5-4) Always Below 1 Ω
      F54-2 (SS-) - F29-33 (TSD) Always Below 1 Ω
      F54-1 (SS+) - Body ground Always 10 kΩ or higher
      F54-2 (SS-) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK COOLER THERMISTOR (SOLAR SENSOR)

    A01UYXAE01
    Text in Illustration
    *a

    Component with harness connected

    (Cooler Thermistor (Solar Sensor))

    1. Remove the cooler thermistor (solar sensor) Click here.

    2. Reconnect the cooler thermistor (solar sensor) connector.

    3. Reconnect the air conditioning amplifier assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F54-1 (SS+) - F54-2 (SS-)

      Ignition Switch ON (IG)

      Sensor subjected to electric light

      		 0.8 to 4.3 V
      F54-1 (SS+) - F54-2 (SS-)

      Ignition 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 1 of the cooler thermistor (solar sensor).

      Tech Tips


      • Use an incandescent light for inspection. Bring it within about 30 cm (11.8 in.) of the cooler thermistor (solar sensor).

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


    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPLACE COOLER THERMISTOR (SOLAR SENSOR) Click here