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No Heating at All [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. READ VALUE USING GTS 
    1. Read the Data List according to the display on the GTS.

      Powertrain > Engine > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Coolant Temperature Engine coolant temperature Min.: -40°C (-40°F)
      Max.: 215°C (419°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

      After warming up the engine, the temperature value displayed is within the range specified in the normal condition column.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO COOLING FAN SYSTEM. Refer to  ON-VEHICLE INSPECTION [10/2022 - ] 

    Result: 

    OK 

    See step  3

  3. PERFORM ACTIVE TEST USING GTS 
    1. 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
      Front Left Air Mix Damper Control Servo Motor This test activates the Front Left Air Mix Damper Control Servo Motor.
      (No. 1 air conditioning radiator damper servo sub-assembly (front left side air mix))      		 128: Min
      384: Max      		 Operate with ignition switch ON.
      Front Right Air Mix Damper Control Servo Motor This test activates the Front Right Air Mix Damper Control Servo Motor.
      (No. 1 air conditioning radiator damper servo sub-assembly (front right side air mix))      		 128: Min
      384: Max      		 Operate with ignition switch ON.
      Fr Control Rear Air Mix Damper Control Servo Motor This test activates the Front Control Rear Air Mix Damper Control Servo Motor.
      (No. 4 air conditioning radiator damper servo sub-assembly (rear air mix))      		 128: Min
      384: Max      		 Operate with ignition switch ON.

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Front Left Air Mix Damper Control Servo Motor
      Data List Display
      Front Left Air Mix Damper Control Servo Motor Actual Pulse

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Front Right Air Mix Damper Control Servo Motor
      Data List Display
      Front Right Air Mix Damper Control Servo Motor Actual Pulse

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      Fr Control Rear Air Mix Damper Control Servo Motor
      Data List Display
      Front Control Rear Air Mix Damper Control Servo Motor Actual Pulse

      OK

      Damper servo motor is operated.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO DTC TROUBLESHOOTING PROCEDURE FOR MALFUNCTIONING DAMPER SERVO MOTOR. Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2023 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK DTC 
    1. Check for DTCs.

      Body Electrical > Air Conditioner > Trouble Codes 

      OK

      DTC B13AE-7F, B144C-7F and B145B-7F are not output

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO DIAGNOSTIC TROUBLE CODE CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [08/2023 - ] 

    Result: 

    OK 

    See step  5

  5. CHECK PROBLEM SYMPTOMS 
    1. Check the vehicle condition.

      Result

      Result Proceed to
      Compressor is operating, but does not heat A
      Operation is stopped due to a high pressure cut B

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  6

  6. CHECK HIGH VOLTAGE ELECTRIC HEATER (ELECTRIC HEATER SUB-ASSEMBLY) 
    1. 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
      High Voltage Electric Heater This test activates High Voltage Electric Heater.
      (Electric heater sub-assembly)      		 OFF: Stopped
      ON: Operating
      • Ignition switch ON (READY)
      • Vehicle stopped
      • EV Mode
      • A/C Switch: ON
      • Mode: Except for DEF
      • Blower: HI
      • Set Temperature: MAX HOT

      Body Electrical > Air Conditioner > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      High Voltage Electric Heater Consumption Electric Power High voltage electric heater consumption electric power 0 to 7000 W Actual high voltage electric heater consumption electric power displayed -

      Body Electrical > Air Conditioner > Active Test 

      Active Test Display
      High Voltage Electric Heater
      Data List Display
      High Voltage Electric Heater Consumption Electric Power

      OK

      The value of the Data List item changes in accordance with the operation of the Active Test.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE HIGH VOLTAGE ELECTRIC HEATER (ELECTRIC HEATER SUB-ASSEMBLY). Refer to  REMOVAL [08/2023 - ] 

    Result: 

    OK 

    See step  7

  7. 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
      		 -
      Rear Right Air Outlet Temperature Rear side target air outlet temperature -327.68 to 327.67°C Rear 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
      Rear Right Set Temperature Rear 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 Rear side set temperature displayed Rear seat heater switch 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
      Rear Right Air Outlet Temperature
      Front Right Set Temperature
      Front Left Set Temperature
      Rear Right 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  8

  8. 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  9

  9. 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 8 to 10 Ω
      2 (HV1) - 5 (HV2) 20°C 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 - ] 

  10. 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
      		 -
      Rear Right Air Outlet Temperature Rear side target air outlet temperature -327.68 to 327.67°C Rear 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
      Rear Right Set Temperature Rear 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 Rear side set temperature displayed Rear seat heater switch 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
      Rear Right Air Outlet Temperature
      Front Right Set Temperature
      Front Left Set Temperature
      Rear Right 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: 

    NG 

    See step  13

    Result: 

    OK 

    See step  11

  11. INSPECT LOW PRESSURE MAGNETIC VALVE (NO. 1 MAGNET VALVE ASSEMBLY) 

    Refer to INSPECTION [08/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPLACE LOW PRESSURE MAGNETIC VALVE (NO. 1 MAGNET VALVE ASSEMBLY). Refer to  REMOVAL [08/2023 - ] 

    Result: 

    OK 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (LOW PRESSURE MAGNETIC VALVE (NO. 1 MAGNET VALVE ASSEMBLY) - HEAT PUMP ECU ASSEMBLY) 
    1. Disconnect the A57 low pressure magnetic valve (No. 1 magnet valve assembly) connector.
    2. Disconnect the A62 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
      A57-1 (LPMV) - A62-11 (LPMV) Always Below 1 Ω
      A57-1 (LPMV) or A62-11 (LPMV) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. 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  14

  14. 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 - ] 

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