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For Vehicle Equipped With SRS Airbag

  1. The 4RUNNER is equipped with an SRS (Supplemental Restraint System), such as the driver AIRBAG, front passenger AIRBAG and seat belt pretensioner. Failure to carry out service operations in the correct sequence could cause the supplemental restraint system to unexpectedly deploy during servicing, possibly leading to a serious accident. Further, if a mistake is made in servicing the supplemental restraint system, it is possible the SRS may fail to operate when required. Before servicing (including removal or installation of parts, inspection or replacement), be sure to read the following items carefully, then follow the correct procedure described in this manual.
  2. GENERAL NOTICE
    1. Malfunction symptoms of the supplemental restraint system are difficult to confirm, so the diagnostic trouble codes become the most important source of information when troubleshooting. When troubleshooting the supplemental restraint system, always inspect the diagnostic trouble codes before disconnecting the battery. See AIR BAG RESTRAINT SYSTEMS .
    2. Work must be started after 90 seconds from the time the ignition switch is turned to the "LOCK" position and the negative (-) terminal cable is disconnected from the battery (The supplemental restraint system is equipped with a back-up power source so that if work is started within 90 seconds of disconnecting the negative (-) terminal cable from the battery, the SRS may deploy.).

      When the negative (-) terminal cable is disconnected from the battery, memory of the clock and audio systems will be cancelled. So before starting work, make a record of the contents memorized by the each memory system. Then when work is finished, reset the clock and audio systems as before. To avoid erasing the memory of each memory system, never use a back-up power supply from another battery.

    3. Even in cases of a minor collision where the SRS does not deploy, the steering wheel pad, front passenger's AIRBAG assembly and seat belt pretensioner should be inspected. See AIR BAG RESTRAINT SYSTEMS .
    4. Never use SRS parts from another vehicle. When replacing parts, replace them with new parts.
    5. Before repairs, remove the AIRBAG sensor if shocks are likely to be applied to the sensor during repairs.
    6. Never disassemble and repair the AIRBAG sensor assembly, steering wheel pad, front passenger air bag or seat belt pretensioner.
    7. If the AIRBAG sensor assembly, steering wheel pad, front passenger AIRBAG or seat belt pretensioner has been dropped, or if there are cracks, dents or other defects in the case, bracket or connector, replace them with new ones.
    8. Do not directly expose the AIRBAG sensor assembly, steering wheel pad, front passenger AIRBAG or seat belt pretensioner directly to hot air or flames.
    9. Use a volt/ohmmeter with high impedance (10 k/Ohm minimum) for troubleshooting of the electrical circuit.
    10. Information labels are attached to the periphery of the SRS components. Follow the instructions on the notices.
    11. After work on the supplemental restraint system is completed, check the SRS warning light. See AIR BAG RESTRAINT SYSTEMS .
  3. Spiral cable (in Combination Switch): the steering wheel must be fitted correctly to the steering column with the spiral cable at the neutral position, see Fig 1, otherwise cable disconnection and other troubles may result. Refer to INSTALLATION concerning correct steering wheel installation.
    Fig 1: Locating Spiral Cable To Steering Column Alignment Marks
    G00372038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. STEERING WHEEL PAD (with AIRBAG):
    1. When removing the steering wheel pad or handling a new steering wheel pad, it should be placed with the pad top surface facing up. Storing the pad with its metallic surface facing upward may lead to a serious accident if the AIRBAG inflates for some reason. In addition do not store a steering wheel pad on top of another one.
    2. Never measure the resistance of the AIRBAG squib. (This may cause the AIRBAG to deploy, which is very dangerous).
    3. Grease should not be applied to the steering wheel pad and the pad should not be cleaned with detergents of any kind.
    4. Store the steering wheel pad where the ambient temperature remains below 93°C (200°F), without high humidity and away from electrical noise.
    5. When using electric welding, first disconnect the AIRBAG connector (yellow color and 2 pins) under the steering column near the combination switch connector before starting work.
    6. When disposing of a vehicle or the steering wheel pad alone, the AIRBAG should be deployed using an SST before disposal. See AIR BAG RESTRAINT SYSTEMS . Carry out the operation in a safe place away from electrical noise.
      Fig 2: Identifying Correct & Incorrect Front Driver Air Bag Storage Positions
      G00372039Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 3: Identifying Causes Of Damage Or Unintentional Front Driver Air Bag Deployment
      G00372040Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. Front passenger AIRBAG assembly:
    1. Always store a removed or new front passenger AIRBAG assembly with the AIRBAG deployment direction facing up. Storing the AIRBAG assembly with the AIRBAG deployment direction facing down could cause a serious accident if the AIRBAG deploys.
    2. Never measure the resistance of the AIRBAG squib. (This may cause the AIRBAG to deploy, which is very dangerous).
    3. Grease should not be applied to the front passenger AIRBAG assembly and the AIRBAG door should not be cleaned with detergents of any kind.
    4. Store the AIRBAG assembly where the ambient temperature remains below 93°C (200°F), without high humidity and away from electrical noise.
    5. When using electric welding, first disconnect the AIRBAG connector (yellow color and 2 pins) installed on assembly before starting work.
    6. When disposing of a vehicle or the AIRBAG assembly alone, the AIRBAG should be deployed using an SST before disposal. See AIR BAG RESTRAINT SYSTEMS . Perform the operation in a safe place away from electrical noise.
      Fig 4: Identifying Correct & Incorrect Front Passenger Air Bag Storage Positions
      G00372041Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 5: Identifying Causes Of Damage Or Unintentional Front Passenger Air Bag Deployment
      G00372042Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. Seat belt pretensioner:
    1. Never measure the resistance of the seat belt pretensioner. (This may cause the seat belt pretensioner to activate which is very dangerous).
    2. Never disassemble the seat belt pretensioner.
    3. Never install the seat belt pretensioner in another vehicle.
    4. Store the seat belt pretensioner where the ambient temperature remains below 80°C (176°F) and away from electrical noise without high humidity.
    5. When using electric welding, first disconnect the connector (yellow color and 2 pins) before starting work.
    6. When disposing of a vehicle or the seat belt pretensioner alone, the seat belt pretensioner should be activated before disposal. See AIR BAG RESTRAINT SYSTEMS . Perform the operation in a safe place away from electrical noise.
    7. The seat belt pretensioner is hot after activation, so let it cool down sufficiently before the disposal. However, never apply water to the seat belt pretensioner.
      Fig 6: Identifying Causes Of Unintentional Seat Belt Pre-Tensioner Damage Or Activation
      G00372043Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. AIRBAG sensor assembly:
    1. Never reuse the AIRBAG sensor assembly involved in a collision when the SRS has deployed.
    2. The connectors to the AIRBAG sensor assembly should be connected or disconnected with the sensor mounted on the floor. If the connectors are connected or disconnected while the AIRBAG sensor assembly is not mounted to the floor, it could cause undesired ignition of the supplemental restraint system.
    3. Work must be started after 90 seconds from the time the ignition switch is turned to the "LOCK" position and the negative (-) terminal cable is disconnected from the battery, even if only loosening the set bolts of the AIRBAG sensor assembly.
  8. Wire harness and connector:

    The SRS wire harness is integrated with the instrument panel wire harness assembly. All the connectors in the system are a standard yellow color. If the SRS wire harness becomes disconnected or the connector becomes broken due to an accident, etc., repair or replace it. See AIR BAG RESTRAINT SYSTEMS .

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