LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2008 >> Highlander Base, FWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System (Except Hybrid) >> Airbag System >> Precaution

Airbag System: Precaution

HINT:

The steering pad, front passenger airbag assembly, front seat side airbag assembly, curtain shield airbag assembly, driver side knee airbag assembly, center airbag sensor assembly, front airbag sensor, side airbag sensor, rear airbag sensor, front seat outer belt assembly are collectively referred to as the SRS parts.

CAUTION:
  • The vehicle is equipped with a Supplemental Restraint System (SRS). It consists of a driver airbag, front passenger airbag, center airbag sensor assembly, front seat side airbags, curtain shield airbags, front seat belt pretensioners, front airbag sensors, side airbag sensors and rear airbag sensors. 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 when 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 procedures exactly as indicated in the repair manual.
  • 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 if work is started within 90 seconds after disconnecting the negative (-) terminal cable from the battery, the SRS may be deployed.)

  • Do not expose any of the SRS parts 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 that does not cause the SRS to deploy, the SRS parts should be inspected.
  • Before beginning repairs, remove the airbag sensors if any kind of shock is likely to occur to the airbag sensors 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 SRS parts in order to reuse them. If any of these parts have been dropped, or any defect is found (e.g. cracks, dents or any other defects) in any of the housings, brackets or connectors, replace the part with a new one.
  • Use a volt/ohmmeter with high impedance (10 kΩ/V minimum) for troubleshooting the electrical circuits.
  • Information labels are attached near the SRS parts. Follow the instructions noted in the caution.
  • After work on the SRS is completed, perform an SRS warning light check (See DTC CHECK/CLEAR  ).
  • 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 to its previous state. Never use a backup power supply for the purpose of retaining the memory of vehicle electronic systems.
  • If the vehicle is equipped with a mobile communication system, refer to PRECAUTION in the INTRODUCTION article.
  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 front seat 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 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. EXPRESSIONS OF IGNITION SWITCH 

    The type of ignition switch used on this model differs according to the specifications of the vehicle.

    The expressions listed in the table below are used in this section.

    IGNITION SWITCH POSITION TABLE

    Switch Type Ignition Switch (position) Engine Switch (condition)
    Expression Ignition Switch off LOCK Off
    Ignition Switch on (IG) ON On (IG)
    Ignition Switch on (ACC) ACC On (ACC)
    Engine Start START Start
  4. FUNCTION OF SRS CONNECTORS 
    1. SRS connectors are located as shown in below.
      Fig 1: Identifying SRS Connectors Diagram (Driver Side)
      G05418927Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 2: Identifying SRS Connectors Diagram (Passenger Side)
      G05418928Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      CONNECTOR REFERENCE TABLE

      No. Connector Type Application
      (1) Terminal Twin-Lock Mechanism Connectors 6, 16, 18, 20, 21, 22, 26, 31, 32, 36
      (2) Activation Prevention Mechanism Connectors 2, 4, 5, 7, 9, 23, 25, 29, 31
      (3) Half Connection Prevention Mechanism Connectors 16, 18, 21, 26, 32
      (4) Connector Position Assurance Mechanism Connectors 6, 20
      (5) Connector Lock Mechanism (1) Connectors 8, 10, 24, 30, 28
      (6) Connector Lock Mechanism (2) Connectors 2, 4
      (7) Improper Connection Prevention Lock Mechanism Connectors 1, 3
    2. All connectors in the SRS 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 preceding pages 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 3: Identifying Male & Female Connector
        G04968693Courtesy 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 4: Identifying Activation Prevention Mechanism
        G05137597Courtesy 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 5: Identifying Half Connection Prevention Mechanism
        G04829938Courtesy 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 6: Identifying Connector Position Assurance Mechanism
        G04829939Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Connector lock mechanism (1):

        Locking the connector lock button connects the connector securely.

        Fig 7: Identifying Connector Lock Mechanism (1)
        G04829940Courtesy 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 8: Identifying Connector Lock Mechanism (2)
        G04979276Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      7. Improper connection prevention lock mechanism:

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

        Fig 9: Identifying Improper Connection Prevention Lock Mechanism
        G04979277Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. DISCONNECTION OF CONNECTORS FOR STEERING PAD, FRONT PASSENGER AIRBAG ASSEMBLY (SQUIB SIDE), CURTAIN SHIELD AIRBAG ASSEMBLY, AND FRONT SEAT OUTER BELT ASSEMBLY 

    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 10: Inserting Screwdriver Tip Between Connector & Base
      G05418936Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. CONNECTION OF CONNECTORS FOR STEERING PAD, FRONT PASSENGER AIRBAG ASSEMBLY (SQUIB SIDE), 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 locked, a click sound can be heard.)
      Fig 11: Pushing Down Securely On Lock Button (Yellow Part) Of Connector
      G05390182Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. DISCONNECTION OF CONNECTOR FOR DRIVER SIDE KNEE AIRBAG ASSEMBLY 

    HINT:

    Tape the screwdriver tip before use.

    1. Release the look button (black part) of the connector using a screwdriver.
    2. Insert the screwdriver tip between the connector and the base, and then raise the connector.
      Fig 12: Releasing Lock Button (Black Part) Of Connector
      G05004962Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. CONNECTION OF CONNECTOR FOR DRIVER SIDE KNEE AIRBAG ASSEMBLY 
    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 13: Pushing Down Lock Button (Yellow Part) Of Connector
      G05004963Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. DISCONNECTION OF CONNECTOR FOR SPIRAL CABLE (INSTRUMENT PANEL WIRE SIDE) AND FRONT PASSENGER AIRBAG ASSEMBLY 
    1. Place a finger on the slider, slide the slider to release the lock, and then disconnect the connector.
      Fig 14: Sliding Slider To Release Lock
      G04829945Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. CONNECTION OF CONNECTOR FOR SPIRAL CABLE (INSTRUMENT PANEL WIRE SIDE) AND FRONT PASSENGER AIRBAG ASSEMBLY 
    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 connected, the slider will slide. Be sure not to touch the slider while connecting, as it may result in an insecure fit.

      Fig 15: Connecting Connector
      G04979281Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. DISCONNECTION OF CONNECTOR FOR CENTER AIRBAG SENSOR ASSEMBLY 
    1. Pull the lever by pushing part A as shown below and disconnect the holder (with connectors).
      Fig 16: Disconnection Of Connector
      G04979284Courtesy 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 17: Using Screwdriver To Unlock Retainer
        G04979285Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Release the fitting lance and remove the holder.
        Fig 18: Identifying Fitting Lance
        G04979286Courtesy 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.

        Fig 19: Identifying Connectors & Holder
        G04979287Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. 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. 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 assembly when it is being connected. Be sure not to hold the holder while connecting, as it may result in an insecure fit.

      Fig 20: Pushing Lever To Connect Holder
      G04979288Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. DISCONNECTION OF CONNECTORS FOR FRONT AIRBAG SENSOR AND FRONT SEAT SIDE AIRBAG ASSEMBLY 
    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 part A shown below when disconnecting.

      Fig 21: Identifying Housing Lock (White Part) & CPA (Yellow Part)
      G04979289Courtesy 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 22: Identifying Position Of Housing Lock (White Part)
      G04979290Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. CONNECTION OF CONNECTORS FOR FRONT AIRBAG SENSOR AND FRONT SEAT SIDE AIRBAG ASSEMBLY 
    1. Before connecting the connectors, check that the position of the housing lock (white part) is as shown below.
      Fig 23: Identifying Position Of Housing Lock (White Part)
      G04979291Courtesy 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 engaged, 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 24: Identifying Housing Lock (White Part) And CPA (Yellow Part)
      G04979292Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. DISCONNECTION OF CONNECTORS FOR 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.
      Fig 25: Sliding Outer Connector Locking Sleeve
      G05418951Courtesy 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 26: Identifying Connector Lock Release Direction
      G04950959Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  16. CONNECTION OF CONNECTORS FOR SIDE AIRBAG SENSOR AND REAR AIRBAG SENSOR 
    1. Connect the connector as shown below (When locking, make sure that the outer returns to its original position and a click sound can be heard).

      HINT:

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

      Fig 27: Connecting Connector
      G04950960Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
scientia non olet · About LEMON Manuals