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Airbag System: Precaution

CAUTION:
  • The vehicle is equipped with a Supplemental Restraint System (SRS). It consists of a driver airbag, front passenger airbag, side airbag, curtain shield airbag and front seat belt pretensioner. Failure to carry out service operations in the correct sequence could cause the SRS to unexpectedly deploy during servicing, possibly leading to a serious accident. Further, if a mistake is made in servicing the SRS, it is possible that the SRS may fail to operate when required. Before performing servicing (including removal or installation of parts, inspection or replacement), be sure to read the following items carefully, then follow the correct procedures indicated in the repair information.
  • Wait at least 90 seconds after the ignition switch is turned off and the negative (-) terminal cable is disconnected from the battery before starting the operation.

    (The SRS is equipped with a backup power source, so that if work is started within 90 seconds after disconnecting the negative (-) terminal cable of the battery, the SRS may be deployed.)

  • Do not expose the steering pad, front passenger airbag assembly, center airbag sensor assembly, front airbag sensor, front seat inner belt assembly, seat position airbag sensor, occupant classification ECU, front seat side airbag assembly, side airbag sensor, curtain shield airbag assembly, rear airbag sensor or front seat outer belt assembly directly to hot air or flames.
NOTE:
  • Malfunction symptoms of the SRS are difficult to confirm, so DTCs are the most important source of information when troubleshooting. When troubleshooting the SRS, always inspect DTCs before disconnecting the battery.
  • Even in the case of a minor collision when the SRS does not deploy, the steering pad, front passenger airbag assembly, center airbag sensor assembly, front airbag sensor, front seat inner belt assembly, seat position airbag sensor, occupant classification ECU, front seat side airbag assembly, side airbag sensor, curtain shield airbag assembly, rear airbag sensor or front seat outer belt assembly should be inspected.
  • Before repair work, remove the airbag sensor if any kind of shock is likely to occur to the airbag sensor during the operation.
  • Never use SRS parts from another vehicle. When replacing parts, replace them with new ones.
  • Never disassemble or repair any of the following parts in order to reuse them. If any of these parts have been dropped, or a defect is found (e.g. cracks, dents or any other defects) in any of the housings, brackets or connectors, then replace the part with a new one.
    1. Steering Pad
    2. Front Passenger Airbag Assembly
    3. Front Seat Side Airbag Assembly
    4. Curtain Shield Airbag Assembly
    5. Center Airbag Sensor Assembly
    6. Front Airbag Sensor
    7. Front Seat Inner Belt Assembly
    8. Seat Position Airbag Sensor
    9. Occupant Classification ECU
    10. Side Airbag Sensor
    11. Rear Airbag Sensor
    12. Front Seat Outer Belt Assembly
  • Use a volt/ohmmeter with high impedance (10 kΩ/V minimum) for troubleshooting the electrical circuits.
  • Information labels are attached near the SRS components. Follow the instructions in the caution.
  • After work on the SRS is completed, perform the SRS warning light check (See DIAGNOSIS SYSTEM  ).
  • When the negative (-) terminal cable is disconnected from the battery, the memory will be cleared. Because of this, be sure to make a record of the contents memorized in each system before starting work. When work is finished, adjust each system as it was before. Never attempt to avoid erasing vehicle system memories by using a backup power supply from outside the vehicle.
  • If the vehicle is equipped with a mobile communication system, refer to the precaution in the INTRODUCTION article.

HINT:

In the airbag system, the center airbag sensor assembly, front airbag sensor LH and RH, driver side and front passenger side - side airbag sensor, driver side and front passenger side rear airbag sensor are collectively referred to as the airbag sensors.

  1. HANDLING PRECAUTIONS FOR AIRBAG SENSORS 
    1. Before starting the following operations, wait for at least 90 seconds after disconnecting the negative (-) terminal cable from the battery:
      1. Replacement of the airbag sensors.
      2. Adjustment of the front/rear doors of the vehicle equipped with the side airbag and curtain shield airbag (fitting adjustment).
    2. When connecting or disconnecting the airbag sensor connectors, ensure that each sensor is installed in the vehicle.
    3. Do not use the airbag sensors which have been dropped during the operation or transportation.
    4. Do not disassemble the airbag sensors.
  2. INSPECTION PROCEDURE FOR VEHICLE INVOLVED IN ACCIDENT 
    1. When the airbag has not deployed, confirm the DTCs by checking the SRS warning light. If there is any malfunction in the SRS airbag system, perform troubleshooting.
    2. When any of the airbags have deployed, replace the airbag sensors and check the installation condition.
  3. SRS CONNECTORS 
    1. SRS connectors are located as shown in the following illustration.
      Fig 1: Identifying SRS Connectors Location
      G05576127Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      ITEM REFERENCE

      No. Item Application
      (1) Terminal Twin-Lock Mechanism Connectors 8, 10, 13, 14, 15, 16, 21, 22
      (2) Activation Prevention Mechanism Connectors 2, 4, 16, 18, 20, 22, 24, 26, 30
      (3) Half Connection Prevention Mechanism Connectors 8, 10, 14, 15,21
      (4) Connector Lock Mechanism (1) Connectors 17, 19, 23, 25, 29
      (5) Connector Lock Mechanism (2) Connector 2, 4
      (6) Improper Connection Prevention Lock Mechanism Connector 1, 3
    2. All connectors in the SRS, except the seat position airbag sensor connector, are colored yellow to distinguish them from other connectors. These connectors have special functions, and are specially designed for the SRS. All SRS connectors use durable gold-plated terminals, and are placed in the locations shown on the previous page to ensure high reliability.
      Fig 2: Identifying Connectors Housing And Spacer
      G05576128Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Terminal twin-lock mechanism:

        All connectors with a terminal twin-lock mechanism have a two-piece component consisting of a housing and a spacer. This design enables the terminal to be locked securely by two locking devices (the retainer and the lance) to prevent terminals from coming out.

      2. Activation prevention mechanism:

        All connectors with an activation prevention mechanism contain a short spring plate. When these connectors are disconnected, the short spring plate creates a short circuit by automatically connecting the positive (+) and negative (-) terminals of the squib.

        Fig 3: Identifying Connector (Activation Prevention Mechanism)
        G05576129Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Half connection prevention mechanism:

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

        Fig 4: Identifying Connector (Half Connection Prevention Mechanism)
        G05576130Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Connector lock mechanism (1):

        Locking the connector lock button connects the connector securely.

        Fig 5: Identifying Connector (Connector Lock Mechanism (1))
        G05576131Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Connector lock mechanism (2):

        Both the primary lock with holder lances and the secondary lock with retainer prevent the connectors from becoming disconnected.

        Fig 6: Identifying Connector (Connector Lock Mechanism (2))
        G05576132Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      6. Improper connection prevention lock mechanism:

        When connecting the holder, the lever is pushed into the end by rotating around the A axis to lock the holder securely.

        Fig 7: Identifying Connector (Improper Connection Prevention Lock Mechanism)
        G05576133Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. DISCONNECTION OF CONNECTORS FOR STEERING PAD, CURTAIN SHIELD AIRBAG ASSEMBLY AND FRONT SEAT OUTER BELT ASSEMBLY 

    HINT:

    Tape up the screwdriver tip before use.

    1. Release the lock button (yellow part) of the connector using a screwdriver.
    2. Insert the screwdriver tip between the connector and the base, and then raise the connector.
      Fig 8: Identifying Connector And Base
      G05576134Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. CONNECTION OF CONNECTORS FOR STEERING PAD, CURTAIN SHIELD AIRBAG ASSEMBLY AND FRONT SEAT OUTER BELT ASSEMBLY 
    1. Connect the connector.
    2. Push down securely on the lock button (yellow part) of the connector. (When locking, a click sound can be heard.)
      Fig 9: Identifying Lock Button
      G05576135Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. DISCONNECTION OF CONNECTOR FOR FRONT PASSENGER AIRBAG ASSEMBLY (INSTRUMENT PANEL WIRE SIDE) 
    1. Place a finger on the slider, slide the slider to release the lock, and then disconnect the connector.
      Fig 10: Sliding Slider To Release Lock
      G05576136Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. CONNECTION OF CONNECTOR FOR FRONT PASSENGER AIRBAG ASSEMBLY (INSTRUMENT PANEL WIRE SIDE) 
    1. Connect the connector as shown in the illustration. (When locking, make sure that the slider returns to its original position and a click sound can be heard.)

      HINT:

      When connecting, the slider will slide. Be sure not to touch the slider while connecting, as it may result in an insecure fit.

      Fig 11: Connecting Slider
      G05576137Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. DISCONNECTION OF CONNECTORS FOR FRONT SEAT SIDE AIRBAG ASSEMBLY 
    1. Place a finger on the slider, slide the slider to release the lock, and then disconnect the connector.
      Fig 12: Sliding Slider To Release Lock
      G05576138Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. CONNECTION OF CONNECTORS FOR FRONT SEAT SIDE AIRBAG ASSEMBLY 
    1. Connect the connector as shown in the illustration. (When locking, make sure that the slider returns to its original position and a click sound can be heard.)

      HINT:

      When connecting, the slider will slide. Be sure not to touch the slider while connecting, as it may result in an insecure fit.

      Fig 13: Connecting Connector
      G05576139Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. DISCONNECTION OF CONNECTOR FOR CENTER AIRBAG SENSOR ASSEMBLY 
    1. Pull the lever by pushing part A as shown in the illustration and disconnect the holder (with connectors).
      Fig 14: Identifying Holder (With Connectors)
      G05576140Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      Perform the following procedures when replacing the holder.

    2. Remove the holder.
      1. Using a screwdriver, unlock the retainer.
        Fig 15: Identifying Holder
        G05576141Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Release the fitting lance and remove the holder.
        Fig 16: Identifying Holder
        G05576142Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Install the holder.
      1. Install the connectors to the holder. (When locking, a click sound can be heard.)

        HINT:

        The retainer is locked when the holder is connected.

        Fig 17: Identifying Connector To Holder
        G05576143Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. CONNECTION OF CONNECTOR FOR CENTER AIRBAG SENSOR ASSEMBLY 
    1. Firmly insert the holder (with connectors) into the center airbag sensor assembly until it cannot be pushed any further.
      2. Fig 18: Identifying Connector For Center Airbag Sensor Assembly
      G05576144Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Push the lever to connect the holder (with connectors). (When locking, a click sound can be heard.)

      HINT:

      The holder slides into the center airbag sensor assembly when it is being connected. Be sure not to hold the holder while connecting, as it may result in an insecure fit.

  12. DISCONNECTION OF CONNECTORS FOR FRONT AIRBAG SENSOR, SIDE AIRBAG SENSOR AND REAR AIRBAG SENSOR 
    1. While holding the sides of the outer connector locking sleeve, slide the outer in the direction shown by the arrow.
      2. Fig 19: Identifying Outer Connector Locking Sleeve
      G05576145Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. When the connector lock is released, the connectors are disconnected.

      HINT:

      Be sure to hold both outer flank sides. Holding the top and bottom will make disconnection difficult.

      Fig 20: Identifying Connectors For Side Airbag Sensor And Rear Airbag Sensor
      G05576146Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. CONNECTION OF CONNECTORS FOR FRONT AIRBAG SENSOR, SIDE AIRBAG SENSOR AND REAR AIRBAG SENSOR 
    1. Connect the connector as shown in the illustration (When locking, make sure that the outer returns to its original position and a click sound can be heard).

      HINT:

      When connecting, the outer will slide. Be sure not to hold the outer while connecting, as it may result in an insecure fit.

      Fig 21: Identifying Connectors For Front Airbag Sensor, Side Airbag Sensor And Rear Airbag Sensor
      G05576147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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