LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2789

DTC Code DTC Name
B2789 No Response from ID BOX

DESCRIPTION

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

DTC No. Detection Item DTC Detection Condition Trouble Area
B2789 No Response from ID BOX No communication between the certification ECU and ID code box for 10 seconds or more.

  • ID code box (immobiliser code ECU)

  • Certification ECU (smart key ECU assembly)

  • Harness or connector

WIRING DIAGRAM

B0049ZEE02

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the power switch off to troubleshoot:

    Connect the GTS to the vehicle, and turn a courtesy light switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

  • Before replacing the certification ECU (smart key ECU assembly) or immobiliser code ECU, refer to the immobiliser system.

Tech Tips

When the communication between the ID code box (immobiliser code ECU) and certification ECU (smart key ECU assembly) stops, DTC B2785 is also stored.

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Entry&Start > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Entry&Start > Trouble Codes
      Result
      Proceed to
      DTC B2789 is output
      DTC B2789 is not output

    DTC B2789 is not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B2789 is output

  3. CHECK HARNESS AND CONNECTOR (ID CODE BOX [IMMOBILISER CODE ECU] - BATTERY AND BODY GROUND)


    1. B004AEXC24
      *a

      Front view of wire harness connector

      (to ID Code Box [Immobiliser Code ECU])

      Disconnect the ID code box (immobiliser code ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P51-5 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      P51-1 (+B) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - ID CODE BOX [IMMOBILISER CODE ECU])


    1. Disconnect the P66 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the P51 ID code box (immobiliser code ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P66-13 (LIN) - P51-2 (LIN1) Always Below 1 Ω
      P66-13 (LIN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - DRIVER SIDE JUNCTION BLOCK ASSEMBLY) Click here

    OK

  5. REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. Temporarily replace the certification ECU (smart key ECU assembly) with a new one.

    2. Clear the DTCs.

      Click here


      Body Electrical > Smart Access > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Entry&Start > Trouble Codes
      Result
      Proceed to
      DTC B2789 is not output
      DTC B2789 is output

    DTC B2789 is not output

    END (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] IS DEFECTIVE)

    DTC B2789 is output

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

  7. CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU [SMART KEY ECU ASSEMBLY] - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the P66 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the 3B driver side junction block assembly connector.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      P66-13 (LIN) - 3B-27 Always Below 1 Ω
      P66-13 (LIN) - Body ground Always 10 kΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      P66-13 (LIN) - 3B-17 Always Below 1 Ω
      P66-13 (LIN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. CHECK HARNESS AND CONNECTOR (ID CODE BOX [IMMOBILISER CODE ECU] - DRIVER SIDE JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the P51 ID code box (immobiliser code ECU) connector.

    2. Disconnect the 3B driver side junction block assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P51-2 (LIN1) - 3B-16 Always Below 1 Ω
      P51-2 (LIN1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    CHECK DRIVER SIDE JUNCTION BLOCK ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR