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Home >> Lexus >> 2024 >> RX 500h >> Repair and Diagnosis >> External Pages >> Different car >> Section 4 (Battery / Charging System - Diagnostic Codes & Symptom Tests) >> CHARGING SYSTEM (for PHEV Model) >> DTC P058A-01: Auxiliary Battery Monitor Module Range/Performance [08/2023 - ] >> Procedure

DTC P058A-01: Auxiliary Battery Monitor Module Range/Performance [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 DTC OUTPUT (HYBRID CONTROL) 
    1. Check for DTCs.

      Powertrain > Hybrid Control > Trouble Codes 

      Result

      Result  Proceed to
      P162B-87 is not output A
      P162B-87 is output B

      HINT: 

      When P162B-87 (Lost Communication with Battery Monitor Module Missing Message) is output at the same time, perform troubleshooting for P162B-87 (Lost Communication with Battery Monitor Module Missing Message) first.

    Result: 

    GO TO DTC CHART (P162B-87). Refer to  DTC P162B-87: Lost Communication with Battery Monitor Module Missing Message [08/2023 - ]  

    Result: 

    See step  2

  2. CHECK BATTERY STATE SENSOR ASSEMBLY INSTALLATION CONDITION 

    HINT: 

    Refer to INSTALLATION [08/2023 - ]

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    INSTALL BATTERY STATE SENSOR ASSEMBLY CORRECTLY. Refer to  INSTALLATION [08/2023 - ] 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 

    Pre-procedure1

    • Check that the battery state sensor assembly connector is securely connected.

      OK

      The connector is securely connected.

    • Disconnect the H37 battery state sensor assembly connector.
    • Check the connector case and terminals for deformation or corrosion.

      OK

      No deformation or corrosion.

    • Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition Result
      H37-3 (+B) - Body ground Ignition switch off 11 to 14 V V
      H37-1 (RBAT) - Body ground Ignition switch off 11 to 14 V V

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    OK 

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

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY STATE SENSOR ASSEMBLY - AUXILIARY BATTERY)