LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2021 >> LC 500h >> Repair and Diagnosis (Single Page) >> Electrical >> Body Electrical >> Sub Battery System - Diagnostic Codes & Circuit Tests >> Sub Battery System >> DTC B2302: Communication Error from Sub Battery Module to Backup Relay [01/2017 - 05/2023] >> Procedure

DTC B2302: Communication Error from Sub Battery Module to Backup Relay [01/2017 - 05/2023]: Procedure

  1. CHECK CONNECTOR CONNECTION CONDITION (SUB-BATTERY MODULE ASSEMBLY) 
    1. Check the connection condition of the sub-battery module assembly connector and the contact pressure of the terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.
      GTY788020Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      - The connector is connected securely.

      - The terminals are not deformed and are connected securely.

      - No water or foreign matter in each connector.

      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 a connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  2

  2. CHECK CONNECTOR CONNECTION CONDITION (BACKUP RELAY) 
    1. Check the connection condition of the backup relay connector and the contact pressure of the terminal. Check the terminals for deformation, and check the connector for water ingress and foreign matter.
      GTY788015Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      OK

      - The connector is connected securely.

      - The terminals are not deformed and are connected securely.

      - No water or foreign matter in each connector.

      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 a connector.) C

    Result: 

    B 

    CONNECT SECURELY 

    Result: 

    C 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    A 

    See step  3

  3. CHECK DTC OUTPUT 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Clear the DTCs.

      Body Electrical > Sub Battery Module > Clear DTCs 

    5. Turn the power switch off and wait for at least 30 seconds.
    6. Turn the power switch on (IG) and wait for at least 20 seconds or more. (A)
    7. Turn the power switch off and wait for at least 30 seconds. (B)
    8. Repeat steps (A) through (B) shown above at least 3 times.
    9. Turn the power switch on (IG).
    10. Turn the Techstream on.
    11. Enter the following menus: Body Electrical / Sub Battery Module / Trouble Codes.

      Body Electrical > Sub Battery Module > Trouble Codes 

    12. Read the DTCs.

      Result

      Result Proceed to
      DTC B2302 is output A
      DTC B2303 and B2304 are output B
      DTC is not output C

    Result: 

    B 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (BACKUP RELAY - SUB-BATTERY MODULE ASSEMBLY) 

    Result: 

    C 

    END 

    Result: 

    A 

    See step  4

  4. CHECK FREEZE FRAME DATA (DTC SUB CODE) 
    1. Check the DTC sub code displayed in the freeze frame data.

      Result

      Result Proceed to
      "38" is output A
      "39" is output B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  5

  5. INSPECT SUB-BATTERY MODULE ASSEMBLY 
    GTY785161Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Component with harness connected
    (Sub-battery Module Assembly)    		 *b Sub-battery Module Assembly
    1. Turn the power switch on (IG).
    2. Inspect the sub-battery module assembly using an oscilloscope.
      GTY804633Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Reference waveform duty ratio: 78 to 82%
      Sub-battery Module Terminal Name b5-8 (BUR) - m1-1 (-BAT)
      Tester Range 5 V/DIV., 10 msec./DIV.
      Condition Power switch on (IG)

      Result

      Result Proceed to
      Duty ratio of normal waveform is 58 to 62% or 78 to 82% A
      No pulse waveforms or pulse output except those listed above B

    Result: 

    B 

    REPLACE SUB-BATTERY MODULE ASSEMBLY. Refer to  REMOVAL [01/2017 - 05/2023] 

    Result: 

    A 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (SUB-BATTERY MODULE ASSEMBLY - BACKUP RELAY) 
    1. Disconnect the sub-battery module assembly connector.
    2. Disconnect the backup relay connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      b5-8 (BUR) - 5D-1 (RLY1) Always Below 1 Ω
      b5-8 (BUR) or 5D-1 (RLY1) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BACKUP RELAY. Refer to  REMOVAL [01/2017 - 05/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  7. INSPECT BACKUP RELAY 
    1. Disconnect the sub-battery module assembly connector
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.
      GTY793557Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Rear view of wire harness connector
      (to Sub-battery Module Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      b5-8 (BUR) - Body ground Power switch on (IG) 8 to 14 V
    4. Reconnect the sub-battery module assembly connector

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE SUB-BATTERY MODULE ASSEMBLY. Refer to  REMOVAL [01/2017 - 05/2023] 

    Result: 

    NG 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (SUB-BATTERY MODULE ASSEMBLY - BACKUP RELAY) 
    1. Disconnect the sub-battery module connector.
    2. Disconnect the backup relay connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      b5-8 (BUR) - 5D-1 (RLY1) Always Below 1 Ω
      b5-8 (BUR) or 5D-1 (RLY1) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BACKUP RELAY. Refer to  REMOVAL [01/2017 - 05/2023] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

scientia non olet · About LEMON Manuals