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PRE-CRASH SAFETY SYSTEM, Diagnostic DTC:B2074

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DTC Code DTC Name
B2074 Driver Side Seat Belt Buckle Switch Circuit Malfunction
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DESCRIPTION

The seat belt control ECU receives driver side buckle switch condition information from the center airbag sensor through the CAN communication line and controls the pre-crash safety system.

This DTC is stored when a buckle switch malfunction signal is received from the airbag system.

When DTC B2074 is detected, DTC B1655 is also output.

DTC No. DTC Detection Condition Trouble Area
B2074 Malfunction signal is received from center airbag sensor

  • Front seat inner belt assembly (for driver side)

  • Center airbag sensor

  • CAN communication system

  • Power management control ECU

  • Seat belt control ECU
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Tip:

This circuit uses CAN communication. Therefore, be sure to check that the CAN communication system is normal before performing inspection (Click here).

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PROCEDURE


  1. Click here

    CHECK DTC OUTPUT (CAN COMMUNICATION SYSTEM)


    1. Clear the DTCs (Click here).

    2. Recheck for DTCs.

      OK
      CAN communication system DTC is not output.

  2. Click here

    CHECK DTC OUTPUT (AIR BAG SYSTEM)


    1. Check DTCs for the air bag system (Click here).

      OK
      Airbag system DTC is not output.

  3. Click here

    CHECK DTC OUTPUT (PRE-CRASH SYSTEM)


    1. Using the intelligent tester, enter the following menus: Body / Pre-Crash / DTC.

    2. Clear the DTCs (Click here).

    3. Recheck for DTCs.

      OK
      DTC B2074 is not output.

  4. Click here

    GO TO CAN COMMUNICATION SYSTEMClick here

  5. Click here

    GO TO AIR BAG SYSTEMClick here

  6. Click here

    REPLACE SEAT BELT CONTROL ECUClick here

  7. Click here

    CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION)Click here