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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 B1471-1C: A/C Inverter High Voltage Power Resource Circuit Voltage Out of Range [11/2023 - ] >> Procedure

DTC B1471-1C: A/C Inverter High Voltage Power Resource Circuit Voltage Out of Range [11/2023 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FOR DTC (HYBRID CONTROL SYSTEM) 
    1. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      DTCs are not output A
      DTCs are output B

    Result: 

    B 

    GO TO HYBRID CONTROL SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2023 - ] 

    Result: 

    A 

    See step  2

  2. INSPECT HV AIR CONDITIONING WIRE 
    WARNING:

    Be sure to wear insulated gloves.

    Pre-procedure1

    1. Disconnect the m1 compressor with motor assembly connector.
      NOTE:

      Do not allow any foreign matter or water to enter the compressor with motor assembly.

    2. Remove the HV air conditioning wire from the inverter with converter assembly.
      NOTE:

      Make sure that no foreign matter, water, etc., enters the inverter with converter assembly.

      HINT: 

      Refer to REMOVAL [11/2023 - ]

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      m1-2 (PB) - m2-1 (ACPB) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  3

  3. INSPECT HV AIR CONDITIONING WIRE 
    WARNING:

    Be sure to wear insulated gloves.

    Pre-procedure1

    1. Disconnect the m1 compressor with motor assembly connector.
      NOTE:

      Do not allow any foreign matter or water to enter the compressor with motor assembly.

    2. Remove the HV air conditioning wire from the inverter with converter assembly.
      NOTE:

      Make sure that no foreign matter, water, etc., enters the inverter with converter assembly.

      HINT: 

      Refer to REMOVAL [11/2023 - ]

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      m1-1 (PE) - m2-2 (ACPE) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    NG 

    REPLACE HV AIR CONDITIONING WIRE. Refer to  REMOVAL [11/2023 - ] 

  4. INSPECT HV AIR CONDITIONING WIRE 
    WARNING:

    Be sure to wear insulated gloves.

    Pre-procedure1

    1. Disconnect the m1 compressor with motor assembly connector.
      NOTE:

      Do not allow any foreign matter or water to enter the compressor with motor assembly.

    2. Remove the HV air conditioning wire from the inverter with converter assembly.
      NOTE:

      Make sure that no foreign matter, water, etc., enters the inverter with converter assembly.

      HINT: 

      Refer to REMOVAL [11/2023 - ]

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      m1-2 (PB) - Other terminals and body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    OK 

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY AND HV AIR CONDITIONING WIRE 

    Compressor with motor assembly: 

    HV air conditioning wire: 

    Result: 

    NG 

    REPLACE HV AIR CONDITIONING WIRE. Refer to  REMOVAL [11/2023 - ] 

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