LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 85 (Heating / Air Conditioning System - Diagnostic Codes (3 Of 3), Circuit Tests & Symptom Tests) >> AIR CONDITIONING SYSTEM (for PHEV Model) >> Front Window Fogging [08/2023 - ] >> Procedure

Front Window Fogging [08/2023 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK REFRIGERANT SHORTAGE 
    1. Prepare the vehicle according to the table below.
      MEASUREMENT CONDITION:

      Item Condition
      A/C Switch On
      Ambient Temperature*1 0 to 49°C (32 to 120°F)
      Air Conditioning Air Inlet Temperature*2 25 to 35°C (77 to 95°F)
      Set Temperature MAX COLD
      Recirculation/fresh Control Switch Recirculation
      Air Vent Damper Position FACE
      Blower Speed HI

      HINT: 

      *1: This inspection can be judged correctly only if the ambient temperature is within a range of 0 to 49°C (32 to 120°F). Therefore, postpone the test if the temperature is low.

      *2: This inspection can be judged correctly only if the air inlet temperature is within a range of 25 to 35°C (77 to 95°F). Therefore, postpone the test if the temperature is out of range.

    2. Using the GTS, check the amount of refrigerant.

      Body Electrical > Air Conditioner > Utility 

      Tester Display
      Refrigerant Gas Volume Check
      NOTE:

      If the conditions for the inspection are not met, "Refrigerant incorrect" will be displayed on the GTS. Confirm the conditions of the inspection and perform the check again.

      HINT: 

      • If the amount of refrigerant is insufficient, "Refrigerant shortage" is displayed on the GTS and the indicator light on the A/C switch turns off.
      • When performing this inspection, a DTC will not be output even if "Refrigerant shortage" is displayed on the GTS.

      Result

      Result Amount of Refrigerant
      Refrigerant shortage Insufficient or leakage
      Refrigerant correct Correct
      Refrigerant incorrect Incorrect

      OK

      "Refrigerant correct" is displayed on the GTS.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CHARGE SYSTEM WITH REFRIGERANT. Refer to  REPLACEMENT [08/2023 - ] 

    Result: 

    OK 

    See step  2

  2. CHECK OPERATION 
    1. Press the front defroster switch on the radio and display receiver assembly and check that the air outlet mode changes to DEF mode.

      OK

      The air outlet mode changes to DEF mode.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO DTC B1403-7F. Refer to  DTC B1403-7F: Front Air Outlet Damper Control Servo Motor Actuator Stuck Off [08/2023 - ] 

    Result: 

    OK 

    See step  3

  3. INSPECT HEATING ELECTRIC EXPANSION VALVE (NO. 2 COOLER EXPANSION VALVE) 
    NOTE:

    Check that the following DTCs are not stored.

    • B3A0B-18
    • B3A0B-19
    1. Install a manifold gauge set.

      Refer to ON-VEHICLE INSPECTION [10/2022 - ]

    2. Perform the Active Test according to the display on the GTS.

      Body Electrical > Air Conditioner > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Heating Electric Expansion Valve This test activates heating electric expansion valve to a target position.
      (Heating electric expansion valve (No. 2 cooler expansion valve))      		 0%: Min.
      100%: Max.
      • Ignition switch ON (READY)
      • EV Mode
      • Blower: Manual Hi
      • Set Temperature: Manual Hi
      • Ambient Temperature: -10°C (14.0°F) or more than -10°C (14.0°F)
      • A/C Switch: OFF
      • Air Inlet Mode: Outside Air
      • Engine Coolant Temperature: 40°C (104°F) or less than 40°C (104°F)

      Body Electrical > Air Conditioner > Active Test 

      Tester Display
      Heating Electric Expansion Valve

      OK

      Read the gauge of the manifold gauge set and check that the value is changing.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HEATING ELECTRIC EXPANSION VALVE (NO. 2 COOLER EXPANSION VALVE). Refer to  REMOVAL [08/2023 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (EVAPORATOR FRONT MAGNETIC VALVE (NO. 2 MAGNET VALVE ASSEMBLY) - HEAT PUMP ECU ASSEMBLY) 
    1. Disconnect the A59 evaporator front magnetic valve (No. 2 magnet valve assembly) connector.
    2. Disconnect the A62 heat pump ECU assembly connector.
    3. Remove the magnet-clutch relay (A/C MG) from the No. 2 engine room relay block and No. 2 junction block assembly.
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A59-2 (VC) - A62-12 (EVMV) Always Below 1 Ω
      Relay terminal 5 - A59-1 (VH) Always Below 1 Ω
      A59-2 (VC) or A62-12 (EVMV) - Body ground Always 10 kΩ or higher
      Relay terminal 5 or A59-1 (VH) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK COOLING ELECTRIC EXPANSION VALVE (COOLER EXPANSION VALVE) 
    1. Set the vehicle to the following conditions.
      MEASUREMENT CONDITION:

      Item Condition
      Vehicle Condition Ignition switch ON (READY)
      A/C Switch On
      Ambient Temperature* 0 to 49°C (32 to 120°F)
      Set Temperature MAX COLD
      Recirculation/fresh Control Switch Recirculation
      Air Vent Damper Position FACE
      Blower Speed HI

      HINT: 

      *: This inspection can be judged correctly only if the ambient temperature is within a range of 0 to 49°C (32 to 120°F). Therefore, postpone the test if the temperature is low.

    2. Using the GTS, perform the Active Test and check the Data List values.

      Body Electrical > Air Conditioner > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Cooling Electric Expansion Valve Operation of the cooler expansion valve Min.: 0%
      Max.: 100%      		 Perform within the range of 20 to 38% (display range is 0 to 100%)

      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) -327.68 to 327.67°C Actual evaporator temperature displayed Evaporator temp. sensor (No. 1 cooler thermistor) circuit malfunction
      Regulator Pressure Sensor Air conditioning pressure sensor -32768 to 32767 kPa(gauge) (-32.768 to 32.767 MPaG) Actual refrigerant pressure displayed
      • Refrigerant line (gas leak etc.)
      • Air conditioning pressure sensor circuit malfunction
      Compressor Actual Speed Compressor speed 0 to 10000 rpm Actual compressor speed displayed When compressor running:
      • Compressor with motor assembly
      Cooling Electric Expansion Valve Target Position Target opening angle of cooling electric expansion valve (cooler expansion valve) 0 to 100 % Target opening angle of cooling electric expansion valve (cooler expansion valve) Cooling electric expansion valve (cooler expansion valve) circuit malfunction
      Subcool Target Temperature Target temperature of the sub-cooler calculated by ECU -327.68 to 327.67°C Target temperature of the sub-cooler calculated by ECU Displays in range of 0 to 30°C (32 to 86°F)
      Subcool Estimated Temperature (ECU Calculation Value) Sub-cooler estimated temperature calculated by ECU -327.68 to 327.67°C Sub-cooler estimated temperature calculated by ECU Displays in range of 0 to 30°C (32 to 86°F)
      Cooling Electric Expansion Valve Actual opening angle of cooling electric expansion valve (cooler expansion valve) 0 to 100 % Actual opening angle following the target opening angle Cooling electric expansion valve (cooler expansion valve) circuit malfunction

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Cooling Electric Expansion Valve
      Data List Display
      Evaporator Fin Thermistor
      Regulator Pressure Sensor
      Compressor Actual Speed
      Cooling Electric Expansion Valve Target Position
      Subcool Target Temperature
      Subcool Estimated Temperature (ECU Calculation Value)
      Cooling Electric Expansion Valve

      OK

      The refrigerant pressure decreases when the control value of the cooler expansion valve is increased 20%.

      The refrigerant pressure increases when the control value of the cooler expansion valve is reverted.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  6

  6. CHECK HEATING ELECTRIC EXPANSION VALVE (NO. 2 COOLER EXPANSION VALVE) 
    1. Set the vehicle to the following conditions.
      MEASUREMENT CONDITION:

      Item Condition
      Vehicle Condition Ignition switch ON (READY)
      A/C Switch On
      Ambient Temperature* 0 to 25°C (32 to 77°F)
      Set Temperature MAX COLD
      Recirculation/fresh Control Switch Recirculation
      Air Vent Damper Position FACE
      Blower Speed HI

      HINT: 

      *: This inspection can be judged correctly only if the ambient temperature is within a range of 0 to 25°C (32 to 77°F). Therefore, postpone the test if the temperature is low.

    2. Using the GTS, perform the Active Test and check the Data List values.

      Body Electrical > Air Conditioner > Active Test 

      Tester Display Measurement Item Control Range Diagnostic Note
      Heating Electric Expansion Valve This test activates heating electric expansion valve to a target position.
      (Heating electric expansion valve (No. 2 cooler expansion valve))      		 0%: Min.
      100%: Max.
      • Ignition switch ON (READY)
      • EV Mode
      • Blower: Manual Hi
      • Set Temperature: Manual Hi
      • Ambient Temperature: -10°C (14.0°F) or more than -10°C (14.0°F)
      • A/C Switch: OFF
      • Air Inlet Mode: Outside Air
      • Engine Coolant Temperature: 40°C (104°F) or less than 40°C (104°F)

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Regulator Pressure Sensor Air conditioning pressure sensor -32768 to 32767 kPa(gauge) (-32.768 to 32.767 MPaG) Actual refrigerant pressure displayed
      • Refrigerant line (gas leak etc.)
      • Air conditioning pressure sensor circuit malfunction
      Front Right Air Outlet Temperature Front right side target air outlet temperature -327.68 to 327.67°C Front right side target air outlet temperature displayed
      • MAX COLD: -327.68°C
      • MAX HOT: 327.67°C
      		 -
      Front Left Air Outlet Temperature Front left side target air outlet temperature -327.68 to 327.67°C Front left side target air outlet temperature displayed
      • MAX COLD: -327.68°C
      • MAX HOT: 327.67°C
      		 -
      Front Right Set Temperature Front right side set temperature MAX COLD / 14.0°C / 14.5°C / 15.0°C / 15.5°C / 16.0°C / 16.5°C / 17.0°C / 17.5°C / 18.0°C / 18.5°C / 19.0°C / 19.5°C / 20.0°C / 20.5°C / 21.0°C / 21.5°C / 22.0°C / 22.5°C / 23.0°C / 23.5°C / 24.0°C / 24.5°C / 25.0°C / 25.5°C / 26.0°C / 26.5°C / 27.0°C / 27.5°C / 28.0°C / 28.5°C / 29.0°C / 29.5°C / 30.0°C / 30.5°C / 31.0°C / 31.5°C / 32.0°C / MAX HOT Front right side set temperature displayed Radio and display receiver assembly circuit malfunction
      Front Left Set Temperature Front left side set temperature MAX COLD / 14.0°C / 14.5°C / 15.0°C / 15.5°C / 16.0°C / 16.5°C / 17.0°C / 17.5°C / 18.0°C / 18.5°C / 19.0°C / 19.5°C / 20.0°C / 20.5°C / 21.0°C / 21.5°C / 22.0°C / 22.5°C / 23.0°C / 23.5°C / 24.0°C / 24.5°C / 25.0°C / 25.5°C / 26.0°C / 26.5°C / 27.0°C / 27.5°C / 28.0°C / 28.5°C / 29.0°C / 29.5°C / 30.0°C / 30.5°C / 31.0°C / 31.5°C / 32.0°C / MAX HOT Front left side set temperature displayed Radio and display receiver assembly circuit malfunction
      Compressor Actual Speed Compressor speed 0 to 10000 rpm Actual compressor speed displayed When compressor running:
      • Compressor with motor assembly
      Heating Electric Expansion Valve Target Position Target opening angle of heating electric expansion valve (No. 2 cooler expansion valve) 0 to 100 % Target opening angle of heating electric expansion valve (No. 2 cooler expansion valve) Heating electric expansion valve (No. 2 cooler expansion valve) circuit malfunction
      Subcool Target Temperature Target temperature of the sub-cooler calculated by ECU -327.68 to 327.67°C Target temperature of the sub-cooler calculated by ECU Displays in range of 0 to 30°C (32 to 86°F)
      Subcool Estimated Temperature (ECU Calculation Value) Sub-cooler estimated temperature calculated by ECU -327.68 to 327.67°C Sub-cooler estimated temperature calculated by ECU Displays in range of 0 to 30°C (32 to 86°F)
      Heating Electric Expansion Valve Actual opening angle of heating electric expansion valve (No. 2 cooler expansion valve) 0 to 100 % Actual opening angle following the target opening angle Heating electric expansion valve (No. 2 cooler expansion valve) circuit malfunction

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Heating Electric Expansion Valve
      Data List Display
      Regulator Pressure Sensor
      Front Right Air Outlet Temperature
      Front Left Air Outlet Temperature
      Front Right Set Temperature
      Front Left Set Temperature
      Compressor Actual Speed
      Heating Electric Expansion Valve Target Position
      Subcool Target Temperature
      Subcool Estimated Temperature (ECU Calculation Value)
      Heating Electric Expansion Valve

      OK

      The refrigerant pressure decreases when the control value of the No. 2 cooler expansion valve is increased 50%.

      The refrigerant pressure increases when the control value of the No. 2 cooler expansion valve is reverted.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEAT PUMP ECU ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    NG 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (HEATING ELECTRIC EXPANSION VALVE (NO. 2 COOLER EXPANSION VALVE) - HEAT PUMP ECU ASSEMBLY) 
    1. Disconnect the A56 heating electric expansion valve (No. 2 cooler expansion valve) connector.
    2. Disconnect the A61 heat pump ECU assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A56-1 (HV3) - A61-23 (HEA2) Always Below 1 Ω
      A56-4 (HV4) - A61-24 (HEA1) Always Below 1 Ω
      A56-5 (HV2) - A61-12 (HEB1) Always Below 1 Ω
      A56-2 (HV1) - A61-11 (HEB2) Always Below 1 Ω
      A56-1 (HV3) or A61-23 (HEA2) - Other terminals and body ground Always 10 kΩ or higher
      A56-4 (HV4) or A61-24 (HEA1) - Other terminals and body ground Always 10 kΩ or higher
      A56-5 (HV2) or A61-12 (HEB1) - Other terminals and body ground Always 10 kΩ or higher
      A56-2 (HV1) or A61-11 (HEB2) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. INSPECT HEATING ELECTRIC EXPANSION VALVE (NO. 2 COOLER EXPANSION VALVE) 
    1. Disconnect the A56 heating electric expansion valve (No. 2 cooler expansion valve) connector.
      GTY1207160Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Heating Electric Expansion Valve (No. 2 Cooler Expansion Valve))
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (HV3) - 4 (HV4) 20°C (68°F) 8 to 10 Ω
      2 (HV1) - 5 (HV2) 20°C (68°F) 8 to 10 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEAT PUMP ECU ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    NG 

    REPLACE HEATING ELECTRIC EXPANSION VALVE (NO. 2 COOLER EXPANSION VALVE). Refer to  REMOVAL [08/2023 - ] 

  9. CHECK HARNESS AND CONNECTOR (COOLING ELECTRIC EXPANSION VALVE (COOLER EXPANSION VALVE) - HEAT PUMP ECU ASSEMBLY) 
    1. Disconnect the q1 cooling electric expansion valve (cooler expansion valve) connector.
    2. Disconnect the A61 heat pump ECU assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      q1-1 (HPR-) - A61-25 (CEA2) Always Below 1 Ω
      q1-4 (HPR+) - A61-13 (CEA1) Always Below 1 Ω
      q1-5 (HPL+) - A61-14 (CEB1) Always Below 1 Ω
      q1-2 (HPL-) - A61-26 (CEB2) Always Below 1 Ω
      q1-1 (HPR-) or A61-25 (CEA2) - Other terminals and body ground Always 10 kΩ or higher
      q1-4 (HPR+) or A61-13 (CEA1) - Other terminals and body ground Always 10 kΩ or higher
      q1-5 (HPL+) or A61-14 (CEB1) - Other terminals and body ground Always 10 kΩ or higher
      q1-2 (HPL-) or A61-26 (CEB2) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. INSPECT COOLING ELECTRIC EXPANSION VALVE (COOLER EXPANSION VALVE) 
    1. Disconnect the q1 cooling electric expansion valve (cooler expansion valve) connector.
      GTY1070559Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Cooling Electric Expansion Valve (Cooler Expansion Valve))
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (HPR-) - 4 (HPR+) 20°C (68°F) 8 to 10 Ω
      2 (HPL-) - 5 (HPL+) 20°C (68°F) 8 to 10 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE HEAT PUMP ECU ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    NG 

    REPLACE COOLING ELECTRIC EXPANSION VALVE (COOLER EXPANSION VALVE). Refer to  REMOVAL [08/2023 - ] 

scientia non olet · About LEMON Manuals