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AIRBAG SYSTEM Diagnosis Circuit

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DTC Code DTC Name
  Diagnosis Circuit
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DESCRIPTION

DTC output mode is set by connecting terminals TC and CG of the DLC3.

DTCs are output by the blinking of the SRS warning light.

Tip:

  • When each warning light stays blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.

  • A DTC output mode signal is transmitted through the CAN communication system to each ECU including the center airbag sensor. Thus, when all systems do not enter DTC output mode, there may be an ECM malfunction.

B001WNGE06
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Click here).

  • When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).

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PROCEDURE


  1. Click here

    CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication system DTC is output.

      Table 1. Result
      Result Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

  2. Click here

    CHECK HARNESS AND CONNECTOR (DLC3 - ECM)


    1. B001YH9E01

      Turn the ignition switch off.

    2. Disconnect the A38 connector from the ECM.

    3. for LHD:


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

        Standard Resistance
        for 1GR-FE, 1UR-FE, 3UR-FE
        Tester Connection Condition Specified Condition
        E22-13 (TC) - A38-16 (TC) Always Below 1 Ω
        for 1VD-FTV
        Tester Connection Condition Specified Condition
        E22-13 (TC) - A38-27 (TC) Always Below 1 Ω

    4. for RHD:


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

        Standard Resistance
        for 1GR-FE, 1UR-FE, 3UR-FE
        Tester Connection Condition Specified Condition
        E22-13 (TC) - A52-16 (TC) Always Below 1 Ω
        for 1VD-FTV
        Tester Connection Condition Specified Condition
        E22-13 (TC) - A52-27 (TC) Always Below 1 Ω

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Table 2. *1 Front view of DLC3:
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    CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND)


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E22-4 (CG) - Body ground Always Below 1 Ω

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. Click here

    CHECK HARNESS AND CONNECTOR (TC OF ECM - BODY GROUND)


    1. for LHD:


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

        Standard Resistance
        for 1GR-FE, 1UR-FE, 3UR-FE
        Tester Connection Condition Specified Condition
        A38-16 (TC) - Body ground Always 1 MΩ or higher
        for 1VD-FTV
        Tester Connection Condition Specified Condition
        A38-27 (TC) - Body ground Always 1 MΩ or higher

    2. for RHD:


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

        Standard Resistance
        for 2UZ-FE, 3UR-FE
        Tester Connection Condition Specified Condition
        A52-16 (TC) - Body ground Always 1 MΩ or higher
        for 1GR-FE, 1VD-FTV
        Tester Connection Condition Specified Condition
        A52-27 (TC) - Body ground Always 1 MΩ or higher

    • OK

      REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU