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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 83 (Heating / Air Conditioning System - Diagnostic Codes (1 Of 3)) >> AIR CONDITIONING SYSTEM (for PHEV Model) >> DTC B1498-87: A/C Inverter Local Missing Message [08/2023 - ] >> Procedure

DTC B1498-87: A/C Inverter Local Missing Message [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 FOR DTC (HYBRID CONTROL) 
    1. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      P058A-01 and P162B-87 are not output A
      P058A-01 or P162B-87 is output B

    Result: 

    B 

    See step  5

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - AUXILIARY BATTERY AND BODY GROUND) 
    WARNING:

    Do not disconnect the connector on the high-voltage side.

    NOTE:

    As other DTCs will be stored when the ignition switch is turned to ON with the connector disconnected, be sure to clear the DTCs after the inspection.

    Pre-procedure1

    • Disconnect the B35 compressor with motor assembly connector.
    • Measure the voltage according to the value(s) in the table below.
      GTY1207164Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Compressor with Motor Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      B35-1 (IG1) - Body ground Ignition switch ON 11 to 14 V V
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B35-2 (GND) - Body ground Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - HYBRID VEHICLE CONTROL ECU) 

    Pre-procedure1

    • Disconnect the B35 compressor with motor assembly connector.
    • Disconnect the A21 hybrid vehicle control ECU connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      B35-3 (DOUT) - A21-16 (LIN3) Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - JUNCTION BLOCK ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    Pre-procedure1

    • Disconnect the S1 compressor with motor assembly connector.
    • Disconnect the R12 and R13 junction block assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      S1-2 (PB) - R12-1 (PB) Always Below 1 Ω Ω
      S1-1 (PE) - R13-1 (PE) Always Below 1 Ω Ω
      S1-2 (PB) - Other terminals and body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. CHECK FOR DTC 

    Pre-procedure1

    • Disconnect the H37 battery state sensor assembly connector.
    • Check for DTCs.

      Body Electrical > Air Conditioner > Trouble Codes 

      Result

      Result Proceed to
      B1498-87 is not output A
      B1498-87 is output B

    Post-procedure1

    • None

    Result: 

    A 

    REPLACE BATTERY STATE SENSOR ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    B 

    See step  6

  6. CHECK FOR DTC (HYBRID CONTROL) 

    Pre-procedure1

    • Connect the H37 battery state sensor assembly connector.
    • Disconnect the B35 compressor with motor assembly connector.
    • Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result Proceed to
      P058A-01 and P162B-87 are not output A
      P058A-01 or P162B-87 is output B

    Post-procedure1

    • None

    Result: 

    A 

    REPLACE COMPRESSOR WITH MOTOR ASSEMBLY. Refer to  REMOVAL [08/2023 - ] 

    Result: 

    B 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (COMPRESSOR WITH MOTOR ASSEMBLY - HYBRID VEHICLE CONTROL ECU) 

    Pre-procedure1

    • Disconnect the A21 hybrid vehicle control ECU connector.
    • Disconnect the B35 compressor with motor assembly connector.
    • Disconnect the H37 battery state sensor assembly connector.
    • Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      A21-16 (LIN3) - B35-3 (DOUT) Always Below 1 Ω Ω
      A21-16 (LIN3) - H37-2 (LIN) Always Below 1 Ω Ω
      A21-16 (LIN3) - Other terminals and body ground Always 10 kΩ or higher kΩ
      B35-3 (DOUT) - Other terminals and body ground Always 10 kΩ or higher kΩ
      H37-2 (LIN) - Other terminals and body ground Always 10 kΩ or higher kΩ

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

    REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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