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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 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
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WIRING DIAGRAM

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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 entry and start system (for start function).

Tip:

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

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PROCEDURE


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    CLEAR DTC


    1. Clear the DTCs.

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      1. Body Electrical > Entry&Start > Clear DTCs


      Result
      Proceed to
      NEXT

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    CHECK FOR DTC


    1. Check for DTCs.

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      1. Body Electrical > Entry&Start > Trouble Codes


      Result
      Proceed to
      DTC B2789 is output
      DTC B2789 is not output

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


    1. Disconnect the G58 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
      G58-5 (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
      G58-1 (+B) - Body ground Power switch off 11 to 14 V
      Result
      Proceed to
      OK
      NG

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the G71 certification ECU (smart key ECU assembly) connector.

    2. Disconnect the G58 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
      G71-13 (LIN) - G58-2 (LIN1) Always Below 1 Ω
      G71-13 (LIN) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    • OK

      REPLACE ID CODE BOX (IMMOBILISER CODE ECU)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR