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Recirculated/Fresh Air Modes Switch without User Input [10/2018 - 07/2022]: Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2024 Lexus UX 250h, 2023 Lexus UX 250h, 2022 Lexus UX 250h, 2021 Lexus UX 250h, and 2020 Lexus UX 250h. However, it is still accessible from the selected car via links, so may be relevant.
  1. CONFIRM MODEL 

    Result

    Result Proceed to
    w/o Satellite Radio A
    w/ Satellite Radio B

    Result: 

    B 

    See step  3

    Result: 

    A 

    See step  2

  2. CHECK CUSTOMIZE SETTING 
    1. Using the Techstream, check that the customize setting Air Inlet Mode is not set to "Automatic".

      Air Conditioner 

      Tester Display Description Default Setting ECU
      Air Inlet Mode Function to change the mode automatically to recirculation air mode when turning the A/C on to cool the cabin quickly Automatic 0:Automatic, 1:Manual Air conditioning amplifier assembly

      OK

      Air Inlet Mode is not set to "Automatic".

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CUSTOMIZE SETTING 

    Set Air Inlet Mode to "Manual"

    Result: 

    OK 

    See step  3

  3. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Air Conditioner / Data List.
    5. Read the Data List according to the display on the Techstream.

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Ambient Temp Sensor Thermistor assembly Min.: -23.30°C (-9.94°F)
      Max.: 65.95°C (150.71°F)      		 Actual ambient temperature displayed Thermistor assembly circuit malfunction
      • When open circuit: -23.30°C (-9.94°F)
      • When short circuit: 65.95°C (150.71°F)

      Body Electrical > Air Conditioner > Data List 

      Tester Display
      Ambient Temp Sensor

      OK

      The value of the display does not change frequently.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO AMBIENT TEMPERATURE DISPLAY SYSTEM. Refer to  Ambient Temperature Display System [10/2018 - ]  

    Result: 

    OK 

    See step  4

  4. READ VALUE USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine / Data List.
    5. Read the Data List according to the display on the Techstream.

      Powertrain > Engine > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Coolant Temperature Engine coolant temperature Min.: -40°C (-40°F), Max.: 140°C (284°F) 75 to 100°C (167 to 212°F): After warming up This is the engine coolant temperature.
      HINT: 
      • After warming up the engine, the engine coolant temperature will be 75 to 100°C (167 to 212°F).
      • After a long soak, the engine coolant temperature, intake air temperature and ambient air temperature will be approximately equal.
      • If the value is -40°C (-40°F), or higher than 135°C (275°F), the sensor circuit is open or shorted.
      • Check if the engine overheats if the value indicated is higher than 135°C (275°F).

      Powertrain > Engine > Data List 

      Tester Display
      Coolant Temperature

      OK

      The value of the display does not change frequently.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO COOLING SYSTEM. Refer to  ON-VEHICLE INSPECTION [10/2018 - 10/2019]  , or refer to  ON-VEHICLE INSPECTION [10/2019 - ] 

    Result: 

    OK 

    See step  5

  5. CHECK REFRIGERANT PRESSURE 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Body Electrical / Air Conditioner / Data List.
    5. Read the Data List according to the display on the Techstream.

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Regulator Pressure Sensor Air conditioner pressure sensor Min.: -66.2 psi (gauge)
      Max.: 478.0 psi (gauge)      		 Actual refrigerant pressure displayed
      • Refrigerant line (gas leak etc.)
      • Air conditioner pressure sensor circuit malfunction

      Body Electrical > Air Conditioner > Data List 

      Tester Display
      Regulator Pressure Sensor
    6. Install a manifold gauge set.
    7. Read the manifold gauge pressure when the following conditions are met.
      1. Prepare the vehicle according to the table below.
        MEASUREMENT CONDITION:

        Item Condition
        Vehicle doors Fully open
        Temperature setting MAX COLD
        Blower speed HI
        A/C switch On
        Recirculation/fresh switch RECIRCULATION
        Interior temperature 25 to 35°C (77 to 95°F)

      Standard Pressure

      Low pressure side 

      150 to 250 kPa (1.5 to 2.5 kgf/cm2 , 22 to 36 psi)

      High pressure side 

      1370 to 1570 kPa (14 to 16 kgf/cm2 , 199 to 228 psi)

    8. Compare the values displayed in the Data List and on the manifold gauge.

      OK

      The values displayed in the Data List and on the manifold gauge match.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO ON-VEHICLE INSPECTION (CHECK REFRIGERANT PRESSURE USING GAUGE). Refer to  ON-VEHICLE INSPECTION [10/2018 - 07/2022] 

    Result: 

    NG 

    REPLACE AIR CONDITIONER PRESSURE SENSOR. Refer to  REMOVAL [10/2018 - ] 

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