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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating / Air Conditioning System (Except HV, W/ Manual A/C) - Diagnostic Codes, Circuit Tests & Symptom Tests >> AIR CONDITIONING SYSTEM (for Gasoline Model with Manual Air Conditioning System) >> DTC B1413: Evaporator Temperature Circuit or Evaporator Fin Thermistor [12/2019 - 10/2022] >> Procedure

DTC B1413: Evaporator Temperature Circuit or Evaporator Fin Thermistor [12/2019 - 10/2022]: Procedure

  1. READ VALUE USING GTS (EVAPORATOR FIN THERMISTOR) 
    1. Read the Data List according to the display on the GTS.

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Evaporator Fin Thermistor Evaporator temp. sensor (No. 1 cooler thermistor) Min.: -29.70°C (-21.46°F)
      Max.: 59.55°C (139.19°F)      		 Actual evaporator temperature displayed Evaporator temp. sensor (No. 1 cooler thermistor) circuit malfunction
      • When open circuit: -29.70°C (-21.46°F)
      • When short circuit: 59.55°C (139.19°F)

      Body Electrical > Air Conditioner > Data List 

      Tester Display
      Evaporator Fin Thermistor

      OK

      The display is as specified in the normal condition column.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

    Result: 

    NG 

    See step  2

  2. INSPECT EVAPORATOR TEMP. SENSOR (NO. 1 COOLER THERMISTOR) 

    Refer to INSPECTION [12/2019 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE EVAPORATOR TEMP. SENSOR (NO. 1 COOLER THERMISTOR). Refer to  REMOVAL [12/2019 - 10/2022] 

    Result: 

    OK 

    See step  3

  3. INSPECT AIR CONDITIONING HARNESS ASSEMBLY 
    1. Remove the air conditioning harness assembly.

      Refer to DISASSEMBLY [12/2019 - 10/2022]

    2. Measure the resistance according to the value(s) in the table below.
      GTY984419Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of air conditioning harness assembly connector
      (to Air Conditioning Amplifier Assembly)      		 *b Front view of air conditioning harness assembly connector
      (to Evaporator Temp. Sensor (No. 1 Cooler Thermistor))

      Standard Resistance

      Tester Connection Condition Specified Condition
      q1-6 (TE) - q2-2 Always Below 1 Ω
      q1-5 (SG) - q2-1 Always Below 1 Ω
      q1-6 (TE) or q2-2 - Other terminals and body ground Always 10 kΩ or higher
      q1-5 (SG) or q2-1 - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022] 

    Result: 

    NG 

    REPLACE AIR CONDITIONING HARNESS ASSEMBLY. Refer to  DISASSEMBLY [12/2019 - 10/2022] 

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