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Airbag System: Precaution

WARNING: This page is about a different car, the 2008 Toyota Tundra. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION:
  • The vehicle is equipped with a Supplemental Restraint System (SRS), which consists of a steering pad, front passenger airbag, curtain shield airbag, front seat side airbag, seat belt pretensioner, center airbag sensor, front airbag sensor, side airbag sensor, door side airbag sensor, occupant classification ECU and seat position airbag sensor. Failure to carry out service procedures in the correct sequence could cause SRS parts to unexpectedly deploy and possibly lead to serious injuries. Furthermore, if a mistake is made when servicing SRS parts, they may fail to operate when required. Before performing servicing (including installation/removal, inspection and replacement of parts), be sure to read the following precautions.
  • Before starting work, wait at least 90 seconds after the ignition switch is turned OFF and after the cable of the negative (-) battery terminal is disconnected. (SRS parts are equipped with a backup power source. If work is started within 90 seconds of turning the ignition switch OFF and disconnecting the cable from the negative (-) battery terminal, SRS parts may deploy.)
  • Do not expose SRS parts directly to hot air or flames.
  • Be sure to perform the initialization of the occupant classification ECU if any of the following conditions occur. If the initialization is not performed, the SRS may not operate properly.
    1. The occupant classification ECU is replaced.
    2. Accessories (seatback tray, seat cover, etc.) are installed onto the vehicle.
    3. The passenger seat is removed from the vehicle, and then reinstalled or replaced.
    4. The passenger airbag ON/OFF indicator light (OFF) comes on when the passenger seat is not occupied.
    5. The vehicle is brought to the workshop for repair due to an accident or collision.
NOTE:
  • Malfunction symptoms of SRS parts are difficult to confirm. DTCs are the most important source of information when troubleshooting. During troubleshooting, always confirm DTCs before disconnecting the cable from the negative (-) battery terminal.
  • For minor collisions where SRS parts do not deploy, always inspect the SRS parts.
  • Before performing repairs, remove airbag sensors if any kind of impact is likely to occur to an airbag sensor during repairs.
  • Never use SRS parts from another vehicle. When replacing SRS parts, replace them with new ones.
  • Never disassemble or attempt to repair SRS parts.
  • If an SRS part has been dropped, or if there are any cracks, dents or other defects in the case, bracket or connector, replace the SRS part with a new one.
  • Use an ohmmeter/voltmeter with high impedance (10 kΩ/V minimum) for troubleshooting the electrical circuits.
  • Information labels are attached to the periphery of SRS parts. Follow the cautions and instructions on the labels.
  • After work on the SRS is completed, perform the SRS warning light check (see DIAGNOSIS SYSTEM  ).
  • When the cable is disconnected from the negative (-) battery terminal, the memory settings of each system will be cleared. Because of this, be sure to write down the settings of each system before starting work. When work is finished, reset the settings of each system as before. Never use a backup power supply from outside the vehicle to avoid erasing the memory in a system.
  • If the vehicle is equipped with a mobile communication system, refer to PRECAUTION .

HINT:

In the airbag system, the center airbag sensor, front airbag sensor LH and RH, side airbag sensor LH and RH, door side airbag sensor LH and RH 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 doors of the vehicle equipped with side airbags and curtain shield airbags (fitting adjustment).
    2. When connecting or disconnecting the airbag sensor connectors, ensure that each sensor is installed in the vehicle.
    3. Do not use airbag sensors which have been dropped during 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 below.
      Fig 1: Identifying SRS Connectors Communication Diagram (1 Of 3)
      G05687310Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: Identifying SRS Connectors Communication Diagram (2 Of 3)
      G05687311Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 3: Identifying SRS Connectors Communication Diagram (3 Of 3)
      G05687312Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      SRS CONNECTOR TERMINAL REFERENCE TABLE

      No. Item Application
      (1) Terminal Twin-Lock Mechanism Connectors 21, 22, 23, 24, 25, 26, 35, 36, 37, 39
      (2) Activation Prevention Mechanism Connectors 2, 4, 24, 26, 36
      (3) Half Connection Prevention Mechanism Connectors 21, 23, 25, 35
      (4) Connector Position Assurance Mechanism Connectors 8, 37, 39,
      (5) Connector Lock Mechanism (1) Connectors 9, 11, 27, 33
      (6) Connector Lock Mechanism (2) Connectors 2, 4
      (7) Improper Connection Prevention Lock Mechanism Connectors 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 below to ensure high reliability.
      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.

        Fig 4: Identifying Connector Housing & Spacer
        G05687313Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      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 5: Identifying Activation Prevention Mechanism
        G05687314Courtesy 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 force so that no continuity exists.

        Fig 6: Identifying Half Connection Prevention Mechanism
        G05687315Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Connector position assurance mechanism:

        Only when the housing lock (white part) is completely engaged, the CPA (yellow part) slides, which completes the connector engagement.

        Fig 7: Identifying Connector Position Assurance Mechanism
        G05687316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Connector lock mechanism (1):

        Locking the connector lock button connects the connector securely.

        Fig 8: Identifying Connector Lock Mechanism (1 Of 2)
        G05687317Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      6. Connector lock mechanism (2):

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

        Fig 9: Identifying Connector Lock Mechanism (2 Of 2)
        G05687318Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      7. Improper connection prevention lock mechanism:

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

        Fig 10: Identifying Improper Connection Prevention Lock Mechanism
        G05687319Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. DISCONNECTION OF CONNECTORS FOR STEERING PAD, FRONT PASSENGER AIRBAG (SQUIB SIDE), CURTAIN SHIELD AIRBAG, FRONT SEAT SIDE AIRBAG AND FRONT SEAT OUTER BELT 

    HINT:

    Tape 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 11: Identifying Steering Pad, Airbags & Front Seat Outer Belt Connectors
      G05687320Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. CONNECTION OF CONNECTORS FOR STEERING PAD, FRONT PASSENGER AIRBAG (SQUIB SIDE), CURTAIN SHIELD AIRBAG, FRONT SEAT SIDE AIRBAG AND FRONT SEAT OUTER BELT 
    1. Connect the connector.
    2. Push down securely on the lock button (yellow part) of the connector. (When locked, a click sound can be heard.)
      Fig 12: Identifying Pushing Down Securely On Lock Button Of Connector
      G05687321Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. DISCONNECTION OF CONNECTOR FOR SPIRAL CABLE (INSTRUMENT PANEL WIRE SIDE) AND FRONT PASSENGER AIRBAG (INSTRUMENT PANEL WIRE SIDE) 
    1. Place a finger on the slider, slide the slider to release the lock, and then disconnect the connector.
      Fig 13: Sliding Slider To Release Lock
      G05687322Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. CONNECTION OF CONNECTOR FOR SPIRAL CABLE (INSTRUMENT PANEL WIRE SIDE) AND FRONT PASSENGER AIRBAG (INSTRUMENT PANEL WIRE SIDE) 
    1. Connect the connector as shown below. (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 14: Identifying Spiral Cable & Front Passenger Airbag Connectors
      G05687323Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. DISCONNECTION OF CONNECTORS FOR FRONT SEAT SIDE AIRBAG 
    1. Place a finger on the slider, slide the slider to release the lock, and then disconnect the connector.
      Fig 15: Identifying Front Seat Side Airbag Connectors
      G05687324Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. CONNECTION OF CONNECTORS FOR FRONT SEAT SIDE AIRBAG 
    1. Connect the connector as shown below. (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 16: Identifying Front Seat Side Airbag Connectors
      G04950948Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. DISCONNECTION OF CONNECTOR FOR CENTER AIRBAG SENSOR 
    1. Pull the lever by pushing part A as shown below and disconnect the holder (with connectors).
      Fig 17: Pulling Lever By Pushing Part A
      G05155708Courtesy 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 18: Unlocking Retainer Using Screwdriver
        G05390188Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Release the fitting lance and remove the holder.
        Fig 19: Identifying Fitting Lance
        G05390189Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Install the holder.
      1. Install the connectors to the holder. (When locked, a click sound can be heard.)

        HINT:

        The retainer is locked when the holder is connected.

  11. CONNECTION OF CONNECTOR FOR CENTER AIRBAG SENSOR 
    1. Firmly insert the holder (with connectors) into the center airbag sensor until it cannot be pushed any further.
      Fig 20: Identifying Holder With Connectors
      G05155711Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Push the lever to connect the holder (with connectors). (When locked, a click sound can be heard.)

      HINT:

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

      Fig 21: Identifying Center Airbag Sensor Connectors
      G05155712Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. DISCONNECTION OF CONNECTOR FOR FRONT AIRBAG SENSOR AND DOOR SIDE AIRBAG SENSOR 
    1. Push down the housing lock (white part) and slide the CPA (yellow part). (At this time, the connector cannot be disconnected yet.)
    2. Push down the housing lock (white part) again and disconnect the connector.

      HINT:

      Do not push down the A part shown below when disconnecting.

      Fig 22: Identifying Housing Lock
      G04950954Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. After disconnecting the connector, check that the position of the housing lock (white part) is as shown below.
      Fig 23: Identifying Proper Position Of Housing Lock
      G04950955Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. CONNECTION OF CONNECTOR FOR FRONT AIRBAG SENSOR AND DOOR SIDE AIRBAG SENSOR 
    1. Before connecting the connectors, check that the position of the housing lock (white part) is as shown below.
      Fig 24: Identifying Position Of Housing Lock (White Part)
      G04950956Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Be sure to engage the connectors until they are locked. (When locking, make sure that a click sound can be heard.)

      HINT:

      When connecting them, the housing lock (white part) slides. Be sure not to hold the housing lock (white part) and part A, as it may result in an insecure fit.

      Fig 25: Identifying Housing Lock & CPA
      G04950957Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. DISCONNECTION OF CONNECTORS FOR SIDE AIRBAG SENSOR 
    1. While holding the sides of the outer connector locking sleeve, slide the sleeve in the direction shown by the arrow.
      Fig 26: Identifying Outer Connector Locking Sleeve
      G04950958Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. When the connector lock is released, the connectors are disconnected.

      HINT:

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

      Fig 27: Identifying Connector Lock Release Direction
      G04950959Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. CONNECTION OF CONNECTORS FOR SIDE AIRBAG SENSOR 
    1. Connect the connector as shown below (When locking, make sure that the outer connector locking sleeve returns to its original position and a click sound can be heard).

      HINT:

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

      Fig 28: Identifying Outer Connector Locking Sleeve
      G04950960Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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