AIR CONDITIONING SYSTEM, Diagnostic DTC:B14A2

DTC Code DTC Name
B14A2 Driver Side Solar Sensor Short Circuit

DESCRIPTION

A01SFUTE22

The cooler (solar sensor) thermistor is installed on the upper side of the instrument panel. It detects sunlight to control air conditioning control in AUTO mode. The output voltage from the cooler (solar sensor) thermistor varies in accordance with the amount of sunlight. When the 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 cooler (solar sensor) thermistor.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B14A2 Driver Side Solar Sensor Short Circuit Short in driver side cooler (solar sensor) thermistor (for dual type) or cooler (solar sensor) thermistor (for single type) circuit

  • Cooler (solar sensor) thermistor

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

  • Air conditioning amplifier assembly

Memorized

(4 sec. or more)*1

WIRING DIAGRAM

A01SFK9E08
A01SFK9E09
*a for Single Type
*b Air Conditioning Amplifier Assembly
*c Cooler (Solar Sensor) Thermistor

PROCEDURE


  1. READ VALUE USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the power switch on (IG).

    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.


      Body Electrical > Air Conditioner > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Solar Sensor (D Side) Driver side cooler (solar sensor) thermistor*1 or cooler (solar sensor) thermistor*2

      Min: 0

      Max: 255

      		 Driver side cooler (solar sensor) thermistor*1 or cooler (solar sensor) thermistor*2 value increase as brightness increases -

      • *1: for Dual Type

      • *2: for Single Type


      Body Electrical > Air Conditioner > Data List
      Tester Display
      Solar Sensor (D Side)
      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. Disconnect the F1*3 or F4*4 cooler (solar sensor) thermistor connector.

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

      Standard Voltage
      for Dual type
      Tester Connection Condition Specified Condition
      F1-1 (SS+) - F1-3 (TSD)*1 Power switch off Below 1 V
      F1-1 (SS+) - F1-3 (TSD)*1 Power switch on (IG) 4.75 to 5.25 V
      F1-1 (SS+) - F1-2 (TSD)*2 Power switch off Below 1 V
      F1-1 (SS+) - F1-2 (TSD)*2 Power switch on (IG) 4.75 to 5.25 V
      Standard Voltage
      for Single type
      Tester Connection Condition Specified Condition
      F4-1 (S5) - F4-2 (SS-) Power switch off Below 1 V
      F4-1 (S5) - F4-2 (SS-) Power switch on (IG) 4.75 to 5.25 V

      • *1: for LHD

      • *2: for RHD

      • *3: for Dual Type

      • *4: for Single Type

      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - COOLER (SOLAR SENSOR) THERMISTOR) Click here

    OK

  3. INSPECT COOLER (SOLAR SENSOR) THERMISTOR


    1. Remove the cooler (solar sensor) thermistor.

    2. Reconnect the F1*3 or F4*4 cooler (solar sensor) thermistor connector.

    3. Turn the power switch on (IG).

    4. A01SF7HC03
      *A for Signal Type
      *B for Dual Type
      *C for LHD
      *D for RHD
      *a

      Component with harness connected

      (Cooler (Solar Sensor) Thermistor)

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

      Standard Voltage
      for Dual type
      Tester Connection Condition Specified Condition
      F1-1 (SS+) - F1-3 (TSD)*1 Sensor is subjected to electric light 0.8 to 4.3 V
      F1-1 (SS+) - F1-3 (TSD)*1 Sensor is covered with a cloth Below 0.8 V
      F1-1 (SS+) - F1-2 (TSD)*2 Sensor is subjected to electric light 0.8 to 4.3 V
      F1-1 (SS+) - F1-2 (TSD)*2 Sensor is covered with a cloth Below 0.8 V
      Standard Voltage
      for Single type
      Tester Connection Condition Specified Condition
      F4-1 (S5) - F4-2 (SS-) Sensor is subjected to electric light 0.8 to 4.3 V
      F4-1 (S5) - F4-2 (SS-) 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 3*1*3, 2*2*3 or 2*4 of the cooler (solar sensor) thermistor.

      • 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 cooler (solar sensor) thermistor.

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


      • *1: for LHD

      • *2: for RHD

      • *3: for Dual Type

      • *4: for Single Type

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPLACE COOLER (SOLAR SENSOR) THERMISTOR Click here

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


    1. Disconnect the E28 air conditioning amplifier assembly connector.

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

      Standard Resistance
      for Dual type
      Tester Connection Condition Specified Condition
      E28-30 (S5-1) - F1-1 (SS+) Always Below 1 Ω
      E28-33 (TSD) - F1-3 (TSD)*1 Always Below 1 Ω
      E28-33 (TSD) - F1-2 (TSD)*2 Always Below 1 Ω
      E28-30 (S5-1) - Body ground Always 10 kΩ or higher
      E28-33 (TSD) - Body ground Always 10 kΩ or higher

      • *1: for LHD

      • *2: for RHD

      Standard Resistance
      for Single type
      Tester Connection Condition Specified Condition
      E28-30 (S5-1) - F4-1 (S5) Always Below 1 Ω
      E28-33 (TSD) - F4-2 (SS-) Always Below 1 Ω
      E28-30 (S5-1) - Body ground Always 10 kΩ or higher
      E28-33 (TSD) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR