DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 91 (Heating / Air Conditioning System (HV) - Diagnostic Codes (2 Of 3)) >> AIR CONDITIONING SYSTEM (for HV Model) >> DTC B1475: A/C Inverter Cooling / Heating System [12/2019 - 11/2023] >> Procedure

DTC B1475: A/C Inverter Cooling / Heating System [12/2019 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK CAN COMMUNICATION SYSTEM 
    1. Using the GTS, check if the CAN communication system is functioning normally.

      Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2021] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2021 - 10/2022] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 11/2023]

      Result

      Result Proceed to
      CAN communication system DTCs are not output A
      CAN communication system DTCs are output B

    Result: 

    B 

    GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2021]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2021 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 11/2023] 

    Result: 

    A 

    See step  2

  2. PERFORM ACTIVE TEST USING GTS (CONTROL THE ENGINE COOLING FAN DUTY RATIO) 
    1. Perform the Active Test according to the display on the GTS.

      Powertrain > Engine > Active Test 

      Tester Display Measurement Item Control Range Restrict Condition
      Control the Engine Cooling Fan Duty Ratio Control the cooling fan 0 to 100% Perform this test when vehicle is stopped.

      Powertrain > Engine > Active Test 

      Tester Display
      Control the Engine Cooling Fan Duty Ratio

      OK

      Electric cooling fan operates smoothly.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO COOLING FAN SYSTEM. Refer to  ON-VEHICLE INSPECTION [12/2019 - ] 

    Result: 

    OK 

    See step  3

  3. CHECK REFRIGERANT PRESSURE 
    1. Install a manifold gauge set.

      Refer to ON-VEHICLE INSPECTION [12/2019 - ]

    2. Prepare the vehicle according to the table below.
      MEASUREMENT CONDITION:

      Item Condition
      Vehicle Condition Ignition switch ON (READY)
      Doors Fully closed (windows also fully closed)
      A/C Switch On
      Recirculation/fresh Control Switch Recirculation
      Set Temperature MAX COLD
      Blower Speed HI
      Air Conditioning Air Inlet Temperature 25 to 35°C (77 to 95°F)
    3. Read the manifold gauge pressure.

      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)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CHARGE REFRIGERANT. Refer to  REPLACEMENT [12/2019 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK FOR DTC 
    1. Clear the DTCs.

      Body Electrical > Air Conditioner > Clear DTCs 

    2. Set the vehicle condition when the DTCs are output.
      1. Set the "Inspection Mode".

        Refer to INSPECTION MODE PROCEDURE [12/2019 - ]

      2. Prepare the vehicle according to the table below for 30 minutes or more.
        Item Condition
        Blower Speed HI
        A/C Switch On
        Set Temperature MAX COLD
    3. Check for DTCs.

      Body Electrical > Air Conditioner > Trouble Codes 

      OK

      DTC B1475 is not output

      NOTE:

      If the engine keeps idling when the ambient temperature is high, the compressor with motor assembly may automatically stop to protect the inverter circuit, and DTC B1475 may be stored.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

    Result: 

    NG 

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

Diesel-Data.com