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Home >> Lexus >> 2006 >> RX 400h FWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System >> Airbag System >> Precaution

Airbag System: Precaution

CAUTION:
  • The vehicle is equipped with a Supplemental Restraint System (SRS). It consists of a driver airbag, front passenger airbag, driver side knee 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 manual.
  • Wait at least 90 seconds after the ignition switch is turned to the "LOCK" position 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, driver side knee airbag assembly, center airbag sensor assembly, front airbag sensor, front seat inner belt assembly, seat position sensor, occupant classification ECU, front seat 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, driver side knee airbag assembly, center airbag sensor assembly, front airbag sensor, front seat inner belt assembly, seat position sensor, occupant classification ECU, front seat airbag assembly, side airbag sensor, curtain shield airbag assembly, rear airbag sensor and 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. Driver Side Knee Airbag Assembly
    4. Front Seat Airbag Assembly
    5. Curtain Shield Airbag Assembly
    6. Center Airbag Sensor Assembly
    7. Front Airbag Sensor
    8. Front Seat Inner Belt Assembly
    9. Seat Position Sensor
    10. Occupant Classification ECU
    11. Side Airbag Sensor
    12. Rear Airbag Sensor
    13. 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 section.
  • When disconnecting the negative (-) battery cable, initialize the following systems after the cable is reconnected.
SYSTEM NAME INDEX

System Name See procedure
Lighting System INITIALIZATION
Sliding Roof Control System INITIALIZATION
Power Window Control System INITIALIZATION
Power Door Lock Control System INITIALIZATION
Power Back Door Control System INITIALIZATION
Back Door Closer System INITIALIZATION
Electrical Back Door Outside Handle System INITIALIZATION
SFI System INITIALIZATION

HINT:

In the airbag system, the center airbag sensor assembly, front airbag sensors LH and RH, side airbag sensors LH and RH, rear airbag sensors 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/rear doors of a vehicle equipped with a 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: Communication Diagram SRS Connectors
      G04114142Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      CONNECTOR AND APPLICATION REFERENCE

      No. Connector Type Application
      (1) Terminal Twin-Lock Mechanism Connectors 2, 4, 8, 10, 15, 16, 17, 18, 19, 20, 21, 27, 28
      (2) Activation Prevention Mechanism Connectors 2, 4, 19, 22, 24, 26, 28, 30, 32, 34
      (3) Electrical Connection Check Mechanism Connectors 1, 2, 3, 4
      (4) Half Connection Prevention Mechanism Connectors 6, 8, 10, 17, 20, 21, 27
      (5) Connector Lock Mechanism Connectors 23, 25, 29, 31, 33
      (6) Connector Position Assurance Mechanism Connector 6
    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.
      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 2: Identifying Terminal Twin-Lock Mechanism
        G04114143Courtesy 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 3: Identifying Activation Prevention Mechanism
        G04114144Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Electrical connection check mechanism: This mechanism electrically checks that the connectors are connected correctly and completely. The electrical connection check mechanism is designed so that the disconnection detection pin connects with the diagnosis terminals when the connector housing lock is locked.
        Fig 4: Identifying Disconnection Detection Pin
        G04114145Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        Fig 5: Identifying Half And Complete Connection
        G04114146Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. 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 6: Identifying Half Connection Prevention Mechanism
        G04114147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Connector lock mechanism:

        Locking the connector lock button connects the connector securely.

        Fig 7: Identifying Connector Lock Mechanism
        G04114148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      6. 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 8: Locating Housing Lock
        G04114149Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. DISCONNECTION OF CONNECTORS FOR STEERING PAD, FRONT PASSENGER AIRBAG ASSEMBLY, DRIVER SIDE KNEE AIRBAG ASSEMBLY, 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 (Procedure A).
    2. Insert the screwdriver tip between the connector and the base, and then raise the connector (Procedure B).
      Fig 9: Inserting Screwdriver Tip Between Connector And Base
      G04114150Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. CONNECTION OF CONNECTORS FOR STEERING PAD, FRONT PASSENGER AIRBAG ASSEMBLY (SQUIB SIDE), DRIVER SIDE KNEE AIRBAG ASSEMBLY, 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 10: Pushing Down On Lock Button (Yellow Part) Of Connector
      G04114151Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. DISCONNECTION OF CONNECTOR FOR FRONT SEAT AIRBAG ASSEMBLY 
    1. Place a finger on the slider, slide the slider to release the lock, and then disconnect the connector.
      Fig 11: Sliding Slider To Releasing Lock
      G04114152Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. CONNECTION OF CONNECTOR FOR FRONT SEAT 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 side. Be sure not to touch the slider while connecting, as it may result in an insecure fit.

      Fig 12: Identifying Front Seat Airbag Assembly Connector
      G04114153Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. DISCONNECTION OF CONNECTOR FOR FRONT 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 in the illustration when disconnecting.

      Fig 13: Pushing Down Housing Lock
      G04114154Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. After disconnecting the connector, check that the position of the housing lock (white part) is as shown in the illustration.
      Fig 14: Identifying Correct Position Of Housing Lock
      G04114155Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. CONNECTION OF CONNECTOR FOR FRONT AIRBAG SENSOR 
    1. Before connecting the connectors, check that the position of the housing lock (white part) is as shown in the illustration.
      Fig 15: Identifying Correct Position Of Housing Lock
      G04114156Courtesy 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 A part, as it may result in an insecure fit.

      Fig 16: Locating Housing Lock
      G04114157Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. DISCONNECTION OF CONNECTORS FOR SIDE AIRBAG SENSOR AND REAR AIRBAG SENSOR 
    1. While holding both the sides of the outer connector locking sleeve, slide the outer in the direction shown by the arrow.
      Fig 17: Sliding Outer
      G04114158Courtesy 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 18: Locating Connector Lock
      G04114159Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. CONNECTION OF CONNECTORS FOR 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 19: Identifying Connector
      G04114160Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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