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LIN COMMUNICATION SYSTEM, Diagnostic DTC:B2789

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DTC Code DTC Name
B2789 No Response from ID BOX
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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 more than 10 seconds.

DTC No. DTC Detection Condition Trouble Area
B2789 No communication between certification ECU (smart key ECU assembly) and 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

  • IMMOBI fuse
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WIRING DIAGRAM

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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.

  • When using the intelligent tester to troubleshoot with the engine switch off:

    Connect the intelligent tester to the DLC3, and turn the courtesy switch on and off at 1.5-second intervals until communication between the intelligent tester and vehicle begins.

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PROCEDURE


  1. Click here

    CHECK HARNESS AND CONNECTOR (ID CODE BOX - BATTERY AND BODY GROUND)


    1. A019PAJE01

      Disconnect the F45 ID code box connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F45-8 (GND) - Body ground Always Below 1 Ω
      Standard Voltage
      Tester Connection Condition Specified Condition
      F45-1 (+B) - Body ground Always 11 to 14 V
      Table 1. Text in Illustration
      *1

      Front view of wire harness connector

      (to ID Code Box (Immobiliser Code ECU))

  2. Click here

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


    1. A019M6YE01

      Disconnect the F58 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F58-29 (LIN) - F45-3 (LIN1) Always Below 1 Ω
      F58-29 (LIN) - Body ground Always 10 kΩ or higher
      Table 2. Text in Illustration
      *1

      Front view of wire harness connector

      (to Certification ECU (Smart Key ECU Assembly))
      *2

      Front view of wire harness connector

      (to ID Code Box (Immobiliser Code ECU))

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    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)


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


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    CHECK DTC OUTPUT


    1. Clear the DTC (Click here).

    2. Recheck for DTCs.

      OK
      DTC B2789 is not output.

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    REPAIR OR REPLACE HARNESS OR CONNECTOR

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    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

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

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    REPAIR OR REPLACE HARNESS OR CONNECTOR, OR REPLACE FUSE