LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2287, B278C

DTC Code DTC Name
B2287 LIN Communication Master Malfunction
B278C Lost Communication with Power Source Control

DESCRIPTION


DTC No. DTC Detection Condition Trouble Area
B2287 Communication malfunction between the certification ECU and the power management control ECU*1 or the power source control ECU*2

  • Harness or connector

  • Certification ECU

  • Power management control ECU*1

  • Power source control ECU*2
B278C Communication between certification ECU and the power management control ECU*1 or the power source control ECU*2 interrupted for 10 seconds or more

*1: for 1KR-FE and 1NR-FE with Entry and Start System

*2: for 1ND-TV with Entry and Start System

WIRING DIAGRAM

A011770E02

INSPECTION PROCEDURE

Tech Tips

When using the intelligent tester, repeatedly turn either front door courtesy light switch off-and-on at intervals of 1.5 seconds or less, until communication between the intelligent tester and vehicle begins.

Note


  • Inspect the fuses for this circuit before starting this inspection procedure.

  • Refer to the Service Bulletin for the installation position of the certification ECU.

PROCEDURE


  1. CLEAR DTC


    1. Clear DTCs Click here.


    NEXT

  2. READ OUTPUT DTC


    1. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B2287 and/or B278C are output A
      B2287 and/or B278C and B2785 are output B

      Tech Tips

      When both B2287 and/or B278C and B2785 are output at the same time, troubleshoot B2785 first.


    B

    DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  3. SYSTEM CHECK


    1. Check the vehicle specifications.

      Result
      Result Proceed to
      for 1KR-FE and 1NR-FE with Entry and Start System A
      for 1ND-TV with Entry and Start System B

    B

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER SOURCE CONTROL ECU) Click here

    A

  4. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER MANAGEMENT CONTROL ECU)


    1. A0118IGE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Certification ECU)
      *2

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D34 certification ECU connector.

    2. Disconnect the D38 power management control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D34-29 (LIN) - D38-24 (LIN2) Always Below 1 Ω
      D38-24 (LIN2) - Body ground Always 10 KΩ or higher

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D38-24 (LIN2) - Body ground Always Below 0.5 V

    5. Reconnect the certification ECU connector.

    6. Reconnect the power management control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - BATTERY AND BODY GROUND)


    1. A0118YGE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the D38 power management control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D38-1 (AM22) - Body ground Always 11 to 14 V
      D38-2 (AM21) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D38-6 (GND) - Body ground Always Below 1 Ω
      D38-5 (GND2) - Body ground Always Below 1 Ω

    4. Reconnect the power management control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. REPLACE POWER MANAGEMENT CONTROL ECU NORMAL ONE


    1. Replace the power management control ECU with a normally functioning part Click here.

    2. Clear DTCs Click here.


    NEXT

  7. RECONFIRM DTC OUTPUT


    1. Recheck for DTCs Click here.

      Result
      Result Proceed to
      DTC B2287 and/or B278C are not output A
      DTC B2287 and/or B278C are output B

    B

    REPLACE CERTIFICATION ECU

    A

    END (POWER MANAGEMENT CONTROL ECU MALFUNCTION)

  8. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - POWER SOURCE CONTROL ECU)


    1. A0118IGE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Certification ECU)
      *2

      Front view of wire harness connector

      (to Power Source Control ECU)

      Disconnect the D34 certification ECU connector.

    2. Disconnect the D73 power source control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D34-29 (LIN) - D73-24 (LIN2) Always Below 1 Ω
      D73-24 (LIN2) - Body ground Always 10 KΩ or higher

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D73-24 (LIN2) - Body ground Always Below 0.5 V

    5. Reconnect the certification ECU connector.

    6. Reconnect the power source control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)


    1. A0118YGE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power source Control ECU)

      Disconnect the D73 power source control ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D73-1 (AM22) - Body ground Always 11 to 14 V
      D73-2 (AM21) - Body ground Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D73-6 (GND) - Body ground Always Below 1 Ω
      D73-5 (GND2) - Body ground Always Below 1 Ω

    4. Reconnect the power source control ECU connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. REPLACE POWER SOURCE CONTROL ECU NORMAL ONE


    1. Replace the power source control ECU with a normally functioning part Click here.

    2. Clear DTCs Click here.


    NEXT

  11. RECONFIRM DTC OUTPUT


    1. Recheck for DTCs Click here.

      Result
      Result Proceed to
      DTC B2287 and/or B278C are not output A
      DTC B2287 and/or B278C are output B

    B

    REPLACE CERTIFICATION ECU

    A

    END (POWER SOURCE CONTROL ECU MALFUNCTION)