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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/ Auto A/C) - Diagnostic Codes (1 Of 2) >> AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System) >> DTC B141A-15: Room Temperature Sensor Circuit Short to Battery or Open [11/2023 - ] >> Procedure

DTC B141A-15: Room Temperature Sensor Circuit Short to Battery or Open [11/2023 - ]: Procedure

  1. CHECK ROOM TEMP. SENSOR (COOLER THERMISTOR) CIRCUIT 

    Pre-procedure1

    1. Disconnect the H55 room temp. sensor (cooler thermistor) connector.
      GTY1250269Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Room Temp. Sensor (Cooler Thermistor))

      Procedure1

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

      Standard Voltage

      Tester Connection Condition Specified Condition
      H55-1 (+) - Body ground Ignition switch ON 0 to 5.5 V

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  2

  2. CLEAR DTC 
    1. Clear the DTCs.

      Body Electrical > Air Conditioner > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  3

  3. CHECK FOR DTC 

    Pre-procedure1

    1. Turn the ignition switch off.
    2. Disconnect the H55 room temp. sensor (cooler thermistor) connector.
      GTY1250267Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Room Temp. Sensor (Cooler Thermistor))
    3. Connect terminals 1 and 2 of the room temp. sensor (cooler thermistor) connector on the wire harness side.
      GTY1233137Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Room Temp. Sensor (Cooler Thermistor)
      *2 Air Conditioning Amplifier Assembly
    4. Turn the ignition switch to ON and wait for 4 seconds or more.

      Procedure1

    5. Check for DTCs.

      Body Electrical > Air Conditioner > Trouble Codes 

      Result

      Result Proceed to
      B141A-11 is output A
      B141A-15 is output B

      Post-procedure1

    6. None

    Result: 

    A 

    REPLACE ROOM TEMP. SENSOR (COOLER THERMISTOR) 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    B 

    See step  4

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

    Pre-procedure1

    1. Disconnect the H55 room temp. sensor (cooler thermistor) connector.
    2. Disconnect the H63 air conditioning amplifier assembly connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      H55-1 (+) - H63-5 (TR) Always Below 1 Ω
      H55-2 (-) - H63-3 (SG-1) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - ROOM TEMP. SENSOR (COOLER THERMISTOR)) 

    Pre-procedure1

    1. Disconnect the H55 room temp. sensor (cooler thermistor) connector.
    2. Disconnect the H63 air conditioning amplifier assembly connector.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      H55-1 (+) or H63-5 (TR) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY 

    Refer to REMOVAL [11/2023 - ]

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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