AIRBAG SYSTEM


  1. FUNCTION OF MAIN COMPONENTS


    1. The airbag system mainly consists of the parts listed in the table below.

      Components Outline
      Airbag Sensor Assembly

      • Detects the deceleration of the vehicle during a collision, determines whether ignition is necessary based on the signals from each airbag sensor, and transmits deployment signals to each airbag and seat belt pretensioner.

      • Provides initial check and diagnosis function.
      Steering Wheel Pad Assembly Mainly consists of an inflator and a bag. Upon receiving a deployment signal from the airbag sensor assembly, the inflator generates gas to deploy the bag.
      Lower No. 1 Instrument Panel Airbag Assembly*1
      Instrument Panel Passenger Airbag without Door Assembly
      Front Seat Side Airbag Assembly
      Curtain Shield Airbag Assembly*1
      Front Airbag Sensor Detects the deceleration of the vehicle during a collision, and transmits the signal to the airbag sensor assembly, from which the airbag sensor assembly determines whether ignition is necessary.
      Side Airbag Sensor Assembly
      No. 2 Side Airbag Sensor Assembly*1
      Door Side Airbag Sensor Assembly*1
      Front Seat Outer Belt Assembly Mainly consists of an inflator and a seat belt. Upon receiving a deployment signal from the airbag sensor assembly, the inflator generates gas to retract the seat belt.
      Rear Seat 3 Point Type Outer Belt Assembly*2
      Airbag Cut Off Switch Cylinder Sub-assembly Transmits on/off signals to the airbag sensor assembly to manually turn on or off the deployment of the instrument panel passenger airbag without door assembly.

      Combination Meter Assembly


      • SRS Warning Light

      		 Provided in the combination meter assembly and comes on when the airbag system malfunctions.

      Telltale Light Assembly


      • AIRBAG ON Indicator Light

      • AIRBAG OFF Indicator Light

      		 Illuminates the AIRBAG ON indicator light and the AIRBAG OFF indicator light.
      ECM*3 Stops the fuel pump when the airbag deployment signal is received.
      Network Gateway ECU*4 Relays and transmits each CAN communication data signal.

      *1: Models with SRS curtain shield airbag

      *2: Models with rear pretensioners

      *3: Except models with 1ND-TV engine

      *4: Models with 2ZR-FE engine

  2. OPERATING CONDITION


    1. Ignition Condition


      1. Deceleration sensors used for the airbag system are installed on various parts on the vehicle and transmit the deceleration data of each part during a collision.

      2. Depending on the situation, the airbag sensor assembly sends a deployment signal to each airbag based on the information from each sensor.

      3. Frontal collision signals are produced based on the information from the airbag sensor assembly and the front airbag sensor. The frontal collision signals are used to deploy the steering wheel pad assembly, instrument panel passenger airbag without door assembly, lower No. 1 instrument panel airbag assembly*1, curtain shield airbag assembly*1 and to activate the front seat belt pretensioners and rear seat belt pretensioners*2.


        • *1: Models with SRS curtain shield airbag

        • *2: Models with rear pretensioners

        Figure 1. Frontal Collision

        B0041ARE01

      4. Side or side rear collision signals are produced based on the information from the airbag sensor assembly and side airbag sensor assembly, No. 2 side airbag sensor assembly*1 or door side airbag sensor assembly*1. Side or side rear collision signals are used to deploy the front seat side airbag assembly, curtain shield airbag assembly*1 and to activate the front seat belt pretensioner and rear seat belt pretensioners*2.

        Tech Tips

        If a collision signal is transmitted from a No. 2 side airbag sensor assembly*1 only, a front seat side airbag assembly will not deploy and also a front seat belt pretensioner will not be activated.


        • *1: Models with SRS curtain shield airbag

        • *2: Models with rear pretensioners

        Figure 2. Side or Rear Side Collision

        B0041D2E01

  3. SYSTEM CONTROL


    1. Airbag for Frontal Collision


      1. For frontal collisions, there are 2 or 5*1 airbags and 2 or 4*2 seat belt pretensioners: a steering wheel pad assembly, instrument panel passenger airbag without door assembly, lower No. 1 instrument panel airbag assembly*1, curtain shield airbag assemblies*1, front seat outer belt assemblies and rear seat 3 point type outer belt assemblies*2. The deployment of the airbags and the activation of the seat belt pretensioners occur simultaneously.


        • *1: Models with SRS curtain shield airbag

        • *2: Models with rear pretensioners

        B0041CSE01

    2. Airbag for Side Collision


      1. For a side collision, if the side airbag sensor assembly and door side airbag sensor assembly*1 detect an impact, it inform the airbag sensor assembly, and the airbag sensor assembly causes the front seat side airbag assembly, curtain shield airbag assembly*1 to deploy simultaneously, and activates the front seat belt pretensioners and rear seat belt pretensioners*2.


        • *1: Models with SRS curtain shield airbag

        • *2: Models with rear pretensioners

        B00416PE01

    3. Airbag for Side Rear Collision (Models with SRS Curtain Shield Airbag)


      1. For a side rear collision, if the No. 2 side airbag sensor assembly detects an impact, it informs the airbag sensor assembly, and the airbag sensor assembly causes the curtain shield airbag assembly to deploy, and activates the rear seat belt pretensioner*.


        • *: Models with rear pretensioners

        B0041JYE01

    4. Primary Check Illumination Control


      1. After the ignition switch is turned ON, the airbag sensor assembly illuminates the SRS warning light in the combination meter assembly for approximately 6 seconds and conducts the primary check. During the primary check, the ignition of airbags is prohibited and a diagnosis of the airbag sensor assembly is performed. If trouble is detected during the primary check, the SRS warning light remains on even after the 6 seconds have elapsed. See the illustration below.

      2. After the ignition switch is turned ON, the airbag sensor assembly operates the AIRBAG ON/OFF indicator lights as shown below to check for an open in the airbag cut-off switch indicator circuit.

        B00416OE05

  4. FUNCTION


    1. Airbag Cut Off Switch Cylinder Sub-assembly


      1. The deployment of the instrument panel passenger airbag without door assembly can be prohibited by operating the airbag cut off switch cylinder sub-assembly located on the side portion of the instrument panel on the front passenger side. When the airbag cut off switch cylinder sub-assembly is turned to off, these airbags will not be deployed even if a collision occurs.

      2. Turn the airbag cut off switch cylinder sub-assembly on and off by inserting the key and turning it.

      3. The AIRBAG ON/OFF indicator lights, which inform the driver of the airbag cut off switch status, have been provided in the telltale light assembly.

      4. The table below shows whether the airbags for the front passenger are enabled or disabled and the AIRBAG ON/OFF indicator lights come on or go off depending on the airbag cut off switch status.

        Item Airbag Cut Off Switch Cylinder Sub-assembly Condition
        ON OFF Malfunction
        Instrument Panel Passenger Airbag without Door Assembly ○ - -
        Front Seat Side Airbag Assembly ○ ○ ○
        Front Seat Outer Belt Assembly ○ ○ ○
        AIRBAG ON Indicator Light ○ - -
        AIRBAG OFF Indicator Light - ○ ○

        • ○: Enabled (Light comes on)

        • -: Disabled (Light goes off)

  5. CONSTRUCTION


    1. Steering Wheel Pad Assembly and Instrument Panel Passenger Airbag without Door Assembly


      1. The steering wheel pad assembly and instrument panel passenger airbag without door assembly mainly consist of an inflator and a bag.

    2. Lower No. 1 Instrument Panel Airbag Assembly (Models with SRS Curtain Shield Airbag)


      1. The lower No. 1 instrument panel airbag assembly consists of an airbag door, an inflator and a bag.

    3. Curtain Shield Airbag Assembly (Models with SRS Curtain Shield Airbag)


      1. Curtain shield airbag assemblies that extend from the front pillar to the roof side rail are installed. Each curtain shield airbag assembly consists of an inflator and a bag.

    4. Front Seat Side Airbag Assembly


      1. Front seat side airbag assemblies are installed in the seat backs of the driver seat and the front passenger seat. Each front seat side airbag assembly consists of an inflator, a bag and a cover.

    5. Front Airbag Sensor


      1. A deceleration sensor is enclosed in the front airbag sensor. Based on the deceleration of the vehicle during a front collision, a distortion is created in the sensor and converted into an electrical signal. Accordingly, the extent of the initial collision can be detected in detail.

        B0041D1E12
        *1 Front Airbag Sensor
        *2 Airbag Sensor Assembly
        *3 Deceleration Sensor

    6. Side Airbag Sensor Assembly


      1. A deceleration sensor is enclosed in the side airbag sensor assembly. Based on the deceleration of the vehicle during a side collision, a distortion is created in the sensor and converted into an electrical signal.

        B0041D1E09
        *1 Side Airbag Sensor Assembly
        *2 Deceleration Sensor
        *3 Airbag Sensor Assembly

    7. Door Side Airbag Sensor Assembly and No. 2 Side Airbag Sensor Assembly (Models with SRS Curtain Shield Airbag)


      1. A deceleration sensor is enclosed in the door side airbag sensor assembly and No. 2 side airbag sensor assembly. Based on the deceleration of the vehicle during a side or side rear collision, a distortion is created in the sensor and converted into an electrical signal.

        B004191E01
        *1 Door Side Airbag Sensor Assembly
        *2 No. 2 Side Airbag Sensor Assembly
        *3 Deceleration Sensor
        *4 Airbag Sensor Assembly

  6. DIAGNOSIS


    1. If the airbag sensor assembly detects a malfunction in the airbag system, the airbag sensor assembly stores the malfunction data in memory, in addition to illuminating the SRS warning light.

    2. The airbag sensor assembly outputs malfunction data and Diagnostic Trouble Codes (DTCs) to the Global TechStream (GTS).

    3. The DTCs can be read after connecting the Global TechStream (GTS) to the DLC3. For details, refer to the Repair Manual.

    4. If the SRS airbag deploys, the airbag sensor assembly will turn on the SRS warning light. However, different from the ordinary diagnosis function, a DTC will not be stored. The SRS warning light cannot be turned off. It is necessary to replace the airbag sensor assembly with a new one.

      B0041E4E09
      *1 Combination Meter Assembly
      *2 Airbag Sensor Assembly
      *3 - SRS Warning Light