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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 73 (Motor Generator Control System (AWD) - Diagnostic Codes (4 Of 5)) >> MOTOR GENERATOR CONTROL SYSTEM (for AWD) >> DTC P1BFC-A2: Battery Discharge Control Circuit System Voltage Low [12/2019 - 11/2023] >> Procedure

DTC P1BFC-A2: Battery Discharge Control Circuit System Voltage Low [12/2019 - 11/2023]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK CONNECTOR CONNECTION CONDITION (INVERTER WITH CONVERTER ASSEMBLY CONNECTOR) 

    Refer to PROCEDURE - Step 3

    Result

    Result Proceed to
    OK A
    NG (The connector is not connected securely.) B
    NG (The terminals are not making secure contact or are deformed, or water or foreign matter exists in the connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (DISCHARGE CONTROL POWER SOURCE CIRCUIT) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Disconnect the A55 inverter with converter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY876550Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A55-9 (GND1) - Body ground Ignition switch off Below 1 Ω
      A55-8 (GND2) - Body ground Ignition switch off Below 1 Ω
    4. Reconnect the A55 inverter with converter assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (INVERTER WITH CONVERTER ASSEMBLY - BODY GROUND) 

    Result: 

    OK 

    See step  3

  3. CHECK FUSE (MG) 
    1. Remove the MG fuse from the No. 5 floor relay block and No. 5 floor junction block assembly.
      GTY907830Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 5 Floor Relay Block and No. 5 Floor Junction Block Assembly
      *2 MG Fuse
    2. Check if there is an open circuit in the MG fuse in the No. 5 floor relay block and No. 5 floor junction block assembly.

      OK

      There is no open circuit in the MG fuse.

    3. Install the MG fuse.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FUSE (MG) 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (MG FUSE - INVERTER WITH CONVERTER ASSEMBLY) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Remove the MG fuse from the No. 5 floor relay block and No. 5 floor junction block assembly.
    3. Disconnect the A55 inverter with converter assembly connector.
    4. Measure the resistance according to the value(s) in the table below.
      GTY910177Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 5 Floor Relay Block and No. 5 Floor Junction Block Assembly *2 MG Fuse Terminal
      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)      		 - -

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (MG fuse terminal) - A55-27 (+B3) Ignition switch off Below 1 Ω
    5. Reconnect the A55 inverter with converter assembly connector.
    6. Install the MG fuse.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (MG FUSE - AUXILIARY BATTERY TERMINAL) 
    1. Disconnect the cable from the negative (-) auxiliary battery terminal.
    2. Disconnect the cable from the positive (+) auxiliary battery terminal.
    3. Remove the MG fuse from the No. 5 floor relay block and No. 5 floor junction block assembly.
      GTY943097Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 5 Floor Relay Block and No. 5 Floor Junction Block Assembly
      *2 MG Fuse Terminal
    4. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      1 (MG fuse terminal) - Auxiliary battery positive (+) cable Ignition switch off Below 1 Ω
      1 (MG fuse terminal) - Body ground Ignition switch off 10 kΩ or higher
    5. Connect the cable to the positive (+) auxiliary battery terminal.
    6. Connect the cable to the negative (-) auxiliary battery terminal.
    7. Install the MG fuse.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (DISCHARGE CONTROL POWER SOURCE CIRCUIT) 
    WARNING:

    Be sure to wear insulated gloves.

    1. Check that the service plug grip is not installed.
      NOTE:

      After removing the service plug grip, do not turn the ignition switch to ON (READY), unless instructed by the repair information because this may cause a malfunction.

    2. Disconnect the A55 inverter with converter assembly connector.
    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Measure the voltage according to the value(s) in the table below.
      GTY934617Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Inverter with Converter Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      A55-27 (+B3) - Body ground Ignition switch off 11 to 14 V
    5. Disconnect the cable from the negative (-) auxiliary battery terminal.
    6. Reconnect the A55 inverter with converter assembly connector.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE INVERTER WITH CONVERTER ASSEMBLY 

    Refer to REMOVAL [12/2019 - 10/2022] , or refer to REMOVAL [10/2022 - 11/2023]

    Result: 

    NG 

    CHECK AUXILIARY BATTERY 

    Refer to ON-VEHICLE INSPECTION [12/2019 - 11/2023]

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