Click here

LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2789

Click here
Click here
DTC Code DTC Name
B2789 No Response from ID BOX
Click here

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

  • ID code box (immobiliser code ECU)

  • Certification ECU (smart key ECU assembly)

  • Harness or connector
Table 1. *a Certification ECU (Smart Key ECU Assembly) *b from Battery *c ID Code Box (Immobiliser Code ECU) *d LIN Communication Line
Click here

WIRING DIAGRAM

Click here

CAUTION / NOTICE / HINT

Note:

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

    Connect the GTS to the vehicle, and turn a courtesy 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.

Tip:

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

Click here

PROCEDURE


  1. Click here

    CLEAR DTC


    1. Clear the DTC (Click here).


  2. Click here

    CHECK FOR DTC


    1. Recheck for DTCs (Click here).

      Table 2. Result
      Result Proceed to
      DTC B2789 is output A
      DTC B2789 is not output B

  3. Click here

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


    1. Disconnect the E130 ECU connector.

    2. Disconnect the E124 box connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E130-6 (LIN) - E124-2 (LIN1) Always Below 1 Ω
      E130-6 (LIN) or E124-2 (LIN1) - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

    CHECK HARNESS AND CONNECTOR (ID CODE BOX (IMMOBILIZER CODE ECU) [BATTERY AND BODY GROUND])


    1. A01XBOIE01

      Disconnect the E124 box connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E124-5 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      E124-1 (+B) - Body ground Always 11 to 14 V
      Table 3. Text in Illustration
      *a

      Front view of wire harness connector

      (to ID Code Box [Immobiliser Code ECU])

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. Click here

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)


    1. Temporarily replace the ID code box (immobiliser code ECU) with a new or normally functioning one.

    2. Clear the DTC (Click here).


  6. Click here

    CHECK FOR DTC


    1. Recheck for DTCs (Click here).

      Table 4. Result
      Result Proceed to
      DTC B2789 is output A
      DTC B2789 is not output B

    • A

      END (ID CODE BOX IS DEFECTIVE)

    • B

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)