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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 10 seconds or more.

DTC No. Detection Item DTC Detection Condition Trouble Area
B2789 No Response from ID BOX No communication between 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)

  • Wire harness or connector

  • SMART fuse
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

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

  • Before replacing the certification ECU (smart key ECU assembly) or ID code box (immobiliser code ECU), refer to Service Bulletin.

  • When using the GTS with the engine switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select Model Code "KEY REGIST" under manual mode and enter the following menus: Body Electrical / Entry&Start(CAN). While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.

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PROCEDURE


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


    1. Disconnect the O6 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the O80 ID code box (immobiliser code ECU) connector.

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

      Note:

      Make sure that each ECU is in sleep mode before performing the inspection. To enter sleep mode, turn the engine switch from on (IG) to off and wait 180 seconds or more without operating any switches.

      Standard Resistance
      Tester Connection Condition Specified Condition
      O6-6 (LIN) - O80-2 (LIN1) Engine switch off Below 1 Ω
      O6-6 (LIN) or O80-2 (LIN1) - Body ground Engine switch off 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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


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

      Standard Voltage
      Tester Connection Condition Specified Condition
      O80-1 (+B) - O80-5 (GND) Always 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O80-5 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

    REPLACE ID CODE BOX (IMMOBILISER CODE ECU)


    1. Replace the ID code box (immobiliser code ECU) with a new one.

      Tip:

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

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    REGISTER ECU CODE REGISTRATION


    1. Register the recognition codes in the ECUs.

      Tip:

      Refer to Service Bulletin.

      Result
      Proceed to
      NEXT

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    CHECK DTC OUTPUT


    1. Clear the DTCs.

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      1. Body Electrical > Entry&Start > Clear DTCs


    2. Recheck for DTCs.


      1. Body Electrical > Entry&Start > Trouble Codes


      OK
      DTC B2789 is not output.
      Result
      Proceed to
      OK
      NG

    • OK

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

    • NG

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)