LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2789

DTC Code DTC Name
B2789 No Response from ID BOX

DESCRIPTION

This DTC is output when LIN communication between the certification ECU (smart key ECU assembly) and the ID code box (immobiliser code ECU) stops for more than 10 seconds.

DTC No. DTC Detection Condition Trouble Area
B2789 No communication between the certification ECU (smart key ECU assembly) and the ID code box (immobiliser code ECU) for more than 10 seconds

  • ID code box (immobiliser code ECU)

  • Certification ECU (smart key ECU assembly)

  • Wire harness or connector

  • Fuse

WIRING DIAGRAM

A0160ETE02

INSPECTION PROCEDURE

Note


  • If the certification ECU (smart key ECU assembly) is replaced, register the key.

  • If the ID code box (immobiliser code ECU) is replaced, register the ECU code and ECU communication ID.

PROCEDURE


  1. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Recheck for DTC.

      OK
      B2789 is not output.

    NG

    CHECK HARNESS AND CONNECTOR (ID CODE BOX BATTERY VOLTAGE AND GROUND) Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  2. CHECK HARNESS AND CONNECTOR (ID CODE BOX BATTERY VOLTAGE AND GROUND)


    1. A01619YE11

      Disconnect the J69 ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J69-8 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      J69-1 (+B) - Body ground Always 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE FUSE

    OK

  3. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU - ID CODE BOX)


    1. A015YJ6E01

      Disconnect the P33 ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P33-10 (LIN) - J69-3 (LIN1) Always Below 1 Ω
      P33-10 (LIN) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE ID CODE BOX (IMMOBILISER CODE ECU)


    1. Replace the ID code box (immobiliser code ECU).


    NEXT

  5. CHECK FOR DTC


    1. Clear the DTC Click here.

    2. Recheck for DTC.

      OK
      B2789 is not output.

    NG

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    OK

    END (ID CODE BOX (IMMOBILISER CODE ECU) IS DEFECTIVE)