SUB BATTERY SYSTEM, Diagnostic DTC:B2304

DTC Code DTC Name
B2304 Communication Error from Backup Relay (BURDIAG2) to Sub Battery Module

DESCRIPTION

The sub-battery module assembly receives RD12 signals from the backup relay.

RD12 signals are PWM communication (Pulse Width Modulation: Modulates pulse width according to duty ratio) and indicates the normal/malfunction condition of the backup relay.

B006AUZE03
DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Memory
B2304 Communication Error from Backup Relay (BURDIAG2) to Sub Battery Module

This DTC is stored when a malfunction is detected in communication from the backup relay (RD12) to the sub-battery module assembly continuously for 10 seconds.

(3 trip detection logic)

  • Harness or connector

  • Backup relay

  • Sub-battery module assembly

 Comes on DTC stored

Tech Tips

The details of a DTC can be checked by using the DTC Sub Code of the freeze frame data that was recorded when the DTC was output.

DTC Sub Code Detail
"3E" Open or short to +B in backup relay signal line (RD12)
"3F" Short to ground in backup relay signal line (RD12)
"40" Waveform malfunction in backup relay signal line (RD12)

WIRING DIAGRAM

B006FTAE12
*a Backup Relay
*b Sub-battery Module Assembly

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the engine switch on (IG) and turn the GTS on.

  3. Clear the DTCs.

    Click here

  4. Turn the engine switch off and wait for at least 30 seconds.

  5. Turn the engine switch on (IG) and wait for at least 15 seconds or more. (A)

  6. Turn the engine switch off and wait for at least 30 seconds. (B)

  7. Repeat steps (A) through (B) shown above at least 3 times.

  8. Turn the engine switch on (IG).

  9. Turn the GTS on.

  10. Enter the following menus: Body Electrical / Sub Battery Module / Trouble Codes.

  11. Check the DTC.

    Tech Tips

    If a DTC is output, the system is malfunctioning.

CAUTION / NOTICE / HINT

Tech Tips

Read freeze frame data using the GTS. Freeze frame data records the sub battery module condition when malfunctions are detected.

PROCEDURE


  1. CHECK CONNECTOR CONNECTION CONDITION (SUB-BATTERY MODULE ASSEMBLY)


    1. Refer to the following procedures for removing the connector cover from the luggage compartment mat sub-assembly.

      Click here

    2. B006GWT

      Check the connection condition of the sub-battery module assembly connector and the contact pressure of the terminal. Check the terminal for deformation, and check the connector for water ingress and foreign matter.

      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

    B

    CONNECT SECURELY

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  2. CHECK CONNECTOR CONNECTION CONDITION (BACKUP RELAY)


    1. Refer to the following procedures for removing the backup relay from the luggage compartment mat sub-assembly.

      Click here

    2. B006BKH

      Check the connection condition of the backup relay connector and the contact pressure of the terminal. Check the terminal for deformation, and check the connector for water ingress and foreign matter.

      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

    B

    CONNECT SECURELY

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  3. CHECK DTC OUTPUT


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Clear the DTCs.


      Body Electrical > Sub Battery Module > Clear DTCs

    5. Turn the engine switch off and wait for at least 30 seconds.

    6. Turn the engine switch on (IG) and wait for at least 15 seconds or more. (A)

    7. Turn the engine 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 engine switch on (IG).

    10. Turn the GTS 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 B2304 is output A
      DTC is not output B

    B

    END

    A

  4. CHECK FREEZE FRAME DATA (DTC SUB CODE)


    1. Check the DTC sub code displayed in the freeze frame data.

      Result
      Result Proceed to
      "3E" is output A
      "3F" is output B
      "40" is output C

    B

    INSPECT SUB-BATTERY MODULE ASSEMBLY Click here

    C

    CHECK HARNESS AND CONNECTOR (SUB-BATTERY MODULE ASSEMBLY - BACKUP RELAY) Click here

    A

  5. 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
      P6-11 (RD2) - 6D-6 (RD12) Always Below 1 Ω
      P6-11 (RD2) or 6D-6 (RD12) - Other terminals Always 10 kΩ or higher

    4. Reconnect the sub-battery module assembly connector.

    5. Reconnect the backup relay connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT BACKUP RELAY


    1. Disconnect the sub-battery module assembly connector

    2. Turn the engine switch on (IG).

    3. B006CF1C10
      *a

      Rear view of wire harness connector

      (to Sub-battery Module Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      P6-11 (RD2) - Body ground Engine switch on (IG) 0 to 1 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SUB-BATTERY MODULE ASSEMBLY Click here

    NG

    REPLACE BACKUP RELAY Click here

  7. INSPECT SUB-BATTERY MODULE ASSEMBLY


    1. Disconnect the backup relay connector

    2. Turn the engine switch on (IG).

    3. B006FE1C06
      *a

      Front view of wire harness connector

      (to Backup Relay)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      6D-6 (RD12) - Body ground Engine switch on (IG) 7 to 14 V

    4. Reconnect the backup relay connector

      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BACKUP RELAY Click here

    NG

  8. 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
      P6-11 (RD2) - 6D-6 (RD12) Always Below 1 Ω
      P6-11 (RD2) or 6D-6 (RD12) - Body ground and other terminals Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE SUB-BATTERY MODULE ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  9. 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
      P6-11 (RD2) - 6D-6 (RD12) Always Below 1 Ω
      P6-11 (RD2) or 6D-6 (RD12) - Body ground and other terminals Always 10 kΩ or higher

    4. Reconnect the sub-battery module assembly connector.

    5. Reconnect the backup relay connector.

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. INSPECT SUB-BATTERY MODULE ASSEMBLY


    1. Turn the engine switch on (IG).

    2. B006FMBC03
      *a Reference waveform duty ratio: 88 to 92%

      Inspect the sub-battery module using an oscilloscope.

      Tester Connection Condition Equipment Setting
      P6-11 (RD2) - U2-1 (-BAT) Engine switch on (IG) 5 V/DIV., 10 msec./DIV.
      Result
      Result Proceed to
      Duty ratio of normal waveform is 88 to 92% A
      No pulse waveforms or pulse output except those listed above B

    A

    REPLACE SUB-BATTERY MODULE ASSEMBLY Click here

    B

    REPLACE BACKUP RELAY Click here