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AIRBAG SYSTEM DIAGNOSIS SYSTEM

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  1. CHECK DLC3


    1. Check the DLC3 (Click here).

  2. FUNCTION OF SRS WARNING LIGHT


    1. Primary check


      1. Turn the power switch off. Wait for at least 2 seconds, then turn the power switch on (IG). The SRS warning light comes on for approximately 6 seconds and diagnosis of the airbag system (including the seat belt pretensioners) is performed.

        Tip:

        If malfunctions are detected during the primary check, the SRS warning light remains on even after the primary check period of approximately 6 seconds.

    2. Constant check


      1. After the primary check, the airbag sensor assembly constantly monitors the airbag system for malfunctions.

        Tip:

        If malfunctions are detected during the constant check, the airbag sensor assembly will indicate the malfunction as follows:


        • The SRS warning light comes on.

        • The SRS warning light goes off, and then comes on. This indicates a source voltage drop. The SRS warning light goes off 10 seconds after the source voltage returns to normal.

    3. Review


      1. When the airbag system is normal:

        The SRS warning light comes on only during the primary check period of approximately 6 seconds after the power switch is turned on (IG).

      2. When the airbag system is malfunctioning:


        • The SRS warning light remains on even after the primary check period.

        • The SRS warning light goes off after the primary check, but comes on again during the constant check.

        • The SRS warning light does not come on when turning the power switch from off to on (IG).

        Tip:

        The airbag sensor assembly keeps the SRS warning light on if airbags have been deployed.

  3. SRS WARNING LIGHT CHECK


    1. A000795

      Turn the power switch on (IG), and check that the SRS warning light comes on for approximately 6 seconds (primary check).

    2. Check that the SRS warning light goes off approximately 6 seconds after the power switch is turned on (IG) (constant check).

      Tip:

      When any of the following symptoms occur, refer to Problem Symptoms Table (Click here).


      • The SRS warning light comes on occasionally after the primary check period.

      • The SRS warning light comes on, but a DTC is not output.

      • The power switch is turned from off to on (IG), but the SRS warning light does not come on.

  4. FUNCTION OF SRS CONNECTORS


    1. A0007AVE03
      A0008D1E03
      A0007YAE05

      The SRS connectors are located as shown in the illustration.

      Connector Type Application
      Terminal Twin-lock Mechanism Connectors 2, 4, 6, 9, 10, 15
      Half Connection Prevention Mechanism Connectors 6, 10
      Activation Prevention Mechanism Connectors 2, 4, 5, 7, 9, 11, 13, 31, 33, 35
      Connector Lock Mechanism (1) Connectors 8, 12, 14, 34, 36
      Connector Position Assurance Mechanism Connectors 16, 18, 20, 22, 32
      Connector Lock Mechanism (2) Connector A
      Improper Connection Prevention Lock Mechanism Connector A
    2. A0006TDE38
      Table 1.
      *1 Lance (Primary Lock)
      *2 Spacer (Secondary Lock)
      *3 Primary Lock
      *4 Secondary Lock

      Terminal twin-lock mechanism


      1. This mechanism is designed to increase the ability of the terminal to remain connected and prevent it from accidentally being disconnected.

      2. The connector has a two-piece construction consisting of the housing and spacer to securely lock the terminal using both the lance (primary lock) and spacer (secondary lock).

    3. A0008Y1E70

      Half connection prevention mechanism


      1. This mechanism is designed to prevent the connector from being connected only halfway.

      2. If the connector is not completely connected, the connector is disconnected due to the spring force so that no continuity exists.

    4. A0005ETE13

      Activation prevention mechanism


      1. This mechanism is designed to create a short circuit automatically between the positive and negative terminals of an airbag power source connector when disconnected.

      2. The short spring plate contained in the connector creates a closed circuit on the airbag side (no potential difference can occur between both terminals), preventing accidental airbag deployment when servicing.

    5. A000680E63
      Table 2.
      *1 Lock the locking button
      *2 Claw on the locking button is locked in the groove
      *3 Claw
      *4 Groove

      Connector lock mechanism (1)


      1. This mechanism is designed to prevent the connector from accidentally being disconnected.

      2. Locking the connector lock button engages the locking button claw to the groove on the other side connector to connect the connector securely.

    6. A00095EE46

      Connector Position Assurance (CPA) mechanism


      1. This mechanism is designed to detect when the connector is connected only halfway.

      2. The CPA and female connector slide to the male connector side at the same time and the primary lock is completed when the female connector is engaged with the male connector. From this point, only the CPA slides to the male connector side and secondary lock is completed when the CPA retainer is engaged with the female connector. When the CPA and female connector ends are aligned, they are completely engaged.

    7. A00060IE11
      Table 3.
      *1 Holder
      *2 Lance
      *3 Claw
      *4 Retainer

      Connector lock mechanism (2)


      1. This mechanism is designed to prevent the connector from accidentally being disconnected.

      2. Sliding the connector all the way into the holder and locking the lance completes the primary lock.

      3. Engaging the retainer to the holder as shown in the illustration completes the secondary lock, preventing the connector from accidentally being disconnected.

    8. A000903E19
      Table 4.
      *1 Top View
      *2 Unlock Rib
      *3 Temporary Hold Lock
      *4 Lever

      Improper connection prevention lock mechanism


      1. This mechanism is designed to prevent the connector from being connected only halfway.

      2. When the holder is connected to the airbag sensor assembly, the unlock rib unlocks the temporary hold lock, allowing the lever to be pushed in by rotating around axis A.

      3. Locking the lever to the holder locks the holder securely.

  5. ACTIVATION PREVENTION MECHANISM


    1. Function of activation prevention mechanism


      1. An activation prevention mechanism is built into the connector of the airbag system squib circuit to prevent accidental airbag activation.

      2. This mechanism closes the circuit when the connector is disconnected by bringing the short spring into contact with the terminals and insulating the circuit from external power sources to prevent accidental airbag activation.

    2. Releasing of activation prevention mechanism


      1. To release the activation prevention mechanism, insert a piece of paper with the same thickness as the male terminal (approximately 0.5 mm (0.0197 in.)) between the terminals and short spring to break the connection.

      2. A0008IBE22

        Refer to the following illustrations concerning connectors utilizing the activation prevention mechanism and its release method.

        CAUTION:

        Never release the activation prevention mechanism on the squib connector even when inspecting with the squib disconnected.

        Note:

        • Do not release the activation prevention mechanism unless specifically directed by the troubleshooting procedure.

        • To prevent the terminal and short spring from being damaged, always use a piece of paper with the same thickness as the male terminal.