AIRBAG SYSTEM


  1. FUNCTION OF MAIN COMPONENTS


    1. The main components in the airbag system have the following functions:

      Components Outline
      Airbag Sensor Assembly

      • In the event of a frontal collision, the airbag sensor assembly receives signals from either of the front airbag sensors. The airbag sensor assembly receives the signal via its judgment circuit and also receives another signal from the safing sensor built into the airbag sensor assembly. After receiving a signal from at least one of the front airbag sensors and the safing sensor, the airbag sensor assembly determines whether the driver airbag, front passenger airbag, driver knee airbag, front passenger seat cushion airbag, curtain shield airbags, side airbags, front seat belt pretensioners and rear seat belt pretensioners should be deployed. The airbag sensor assembly also diagnosis system malfunctions.

      • In the event of a side or rear side collision, the airbag sensor assembly receives signals from the door side airbag sensor, side airbag sensor assembly*1 or airbag sensor rear. The airbag sensor assembly receives the signal via its judgment circuit and also receives another signal from the safing sensor built into the airbag sensor assembly. After receiving a signal from at least one of the side sensors and the safing sensor, the airbag sensor assembly determines whether the front seat airbag assemblies, rear seat airbag assemblies, curtain shield airbag assemblies and seat belt pretensioner should be deployed. The airbag sensor assembly also diagnosis system malfunctions.

      • The airbag sensor assembly sends an airbag deployment signal to the ECM through the Controller Area Network (CAN) to operate fuel pump control.
      Horn Button Assembly Used as supplements to the seat belts to help reduce impact to the occupants.
      Instrument Panel Passenger Airbag without Door Assembly
      No. 1 Instrument Panel Lower Airbag Assembly
      Front Seat Airbag Assembly LH/RH
      Front Seat Cushion Airbag Assembly
      Rear Seat Airbag Assembly LH/RH
      Curtain Shield Airbag Assembly LH/RH
      Front Airbag Sensor LH/RH Based on the deceleration of the vehicle during a frontal collision, distortion is created in the sensor and is converted into an electrical signal.
      Airbag Sensor Rear LH/RH Based on the deceleration of the vehicle during a side or rear side collision, distortion is created in the sensor and is converted into an electrical signal.
      Side Airbag Sensor Assembly LH/RH*1
      Door Side Airbag Sensor LH/RH Detects deformation of the front doors during a side collision using the pressure sensor and sends signals for the airbag sensor assembly to determine if deployment of SRS components is necessary.
      Front Seat Outer Belt Assembly LH/RH The front seat outer belt assemblies are used to help reduce impact to the occupants.
      Rear No. 1 Seat Outer Belt Assembly LH/RH The rear No. 1 seat outer belt assemblies are used to help reduce impact to the occupants.
      Seat Position Airbag Sensor The seat position airbag sensor detects the slide position of the driver seat.
      ECM

      • The ECM receives an airbag deployment signal from the airbag sensor assembly during a frontal, side or rear side collision.

      • In the event of a frontal collision the ECM shuts down the fuel supply, in order to ensure safety.
      Airbag Cut Off Switch Cylinder Sub-assembly*2 The airbag cut off switch cylinder sub-assembly suspends the instrument panel passenger airbag without door assembly operation.

      Radio Receiver Assembly


      • AIRBAG ON/OFF Indicator Light*2, *3

      		 The airbag ON/OFF indicator lights inform the occupants of the airbag cut off switch cylinder sub-assembly status.*2
      The AIRBAG ON/OFF indicator lights inform the driver whether the occupant detection ECU puts the instrument panel passenger airbag without door assembly, front seat cushon airbag assembly, front seat airbag assembly RH and front seat outer belt assembly RH into an active state or inactive state.*3
      Occupant Detection ECU*3 The occupant detection ECU judges whether the front passenger seat is occupied based on signals from the 2 occupant classification sensors and the front passenger seat belt buckle switch.
      Front Occupant Classification Sensor LH/Rear Occupant Classification Sensor LH*3 The sensors are strain gauge type sensors that send signals to the occupant detection ECU in accordance with the weight of the occupant.
      Combination Meter Assembly SRS Airbag Warning Light Turns on to alert the driver when the airbag sensor assembly detects a malfunction in the airbag system.
      Multi-information Display Displays a warning message to inform the driver of a malfunction in the system.
      Master Warning Light Turns on to alert the driver when the airbag sensor assembly detects a malfunction in the system.
      Multi Buzzer Sounds to warn the driver of a malfunction in the system.

      *1: Models for Europe and Destination Package for South Africa

      *2: Models with airbag cut off switch cylinder

      *3: Destination package for South Korea

  2. SYSTEM CONTROL


    1. Airbag for Frontal Collision


      1. There are 10 airbags which deploy in the event of a frontal collision: the horn button assembly, instrument panel passenger airbag without door assembly, No. 1 instrument panel lower airbag assembly, front seat cushion airbag assembly, front seat airbag assemblies, rear seat airbag assemblies and curtain shield airbag assemblies. These airbags deploy simultaneously. The horn button assembly and instrument panel passenger airbag without door assembly use dual-stage control. In addition, the front pretensioners contained in the front seat outer belt assemblies LH and RH, and rear pretensioners contained in the rear No. 1 seat outer belt assembly LH and RH are also activated.

      2. The airbag sensor assembly detects the information in the table below from various sources in order to activate the dual-stage control.

      3. For a frontal collision, if a front airbag sensor detects an impact, it informs the airbag sensor assembly. The airbag sensor assembly causes the horn button assembly, instrument panel passenger airbag without door assembly, No. 1 instrument panel lower airbag assembly, front seat cushion airbag assembly, front seat airbag assemblies, rear seat airbag assemblies and curtain shield airbag assemblies to deploy. At the same time, the airbag sensor assembly activates the seat belt pretensioners for the driver, front passenger and rear passengers.

        A01VQVKE01

      4. Deceleration sensors used for the SRS airbag system are installed on various parts on the vehicle and calculate the deceleration (or acceleration) rate of each part during a collision.

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

      6. Frontal collision signals are produced based on the information from the airbag sensor assembly and front airbag sensors. Frontal collision signals are used to activate the front seat outer belt assemblies and 3 point type rear seat outer belt assemblies and to deploy all the airbags and activate the pretensioners as indicated in the table below.

        Figure 1. Frontal Collision

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    2. Airbag for Side/Rear Side Collision


      1. There are 3 airbags which deploy in the event of a severe side collision: the front seat airbag assembly, rear seat airbag assembly and curtain shield airbag assembly. These airbags deploy simultaneously. Additionally, at the same time, the front seat outer belt assembly and rear No. 1 seat outer belt assembly are also activated.

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


        • *: Models for Europe and destination package for South Africa

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      3. The front seat airbag assembly, rear seat airbag assembly and curtain shield airbag assembly are deployed and the front pretensioner in the front seat outer belt assembly LH or RH and rear pretensioner in the rear No. 1 seat outer belt assembly LH or RH is activated based on signals from the door side airbag sensors, side airbag sensor assemblies*and airbag sensor assembly.


        • *: Models for Europe and destination package for South Africa

        Figure 2. Except Models for Europe and Destination Package for South Africa

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        Figure 3. Models for Europe and Destination Package for South Africa

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      4. For a rear side collision, if the airbag sensor rear detects an impact, it informs the airbag sensor assembly and the airbag sensor assembly causes the curtain shield airbag assembly LH or RH, rear seat airbag assembly LH or RH and rear No. 1 seat outer belt assembly RH or LH to be deployed.

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      5. The curtain shield airbag assembly and rear seat airbag assembly are deployed and rear pretensioner in the rear No. 1 seat outer belt assembly is actived based on signals from the airbag sensor and the airbag sensor assembly.

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    3. Airbag for Roll Over (Destination Package for South Korea)


      1. If the vehicle is tilted and rolls over, the airbag sensor assembly activates the seat belt pretensioners for the driver, front passenger, rear seat outer passengers and left and right curtain shield airbags based on signals that show the vehicle's roll angle and rotation speed.

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      2. If the vehicle rolls over in a side collision, the airbag sensor assembly causes the front seat airbag assembly, rear seat airbag assembly and curtain shield airbag assembly to deploy based on signals from the airbag sensor rear and door side airbag sensor. At the same time, the airbag sensor assembly activates the seat belt pretensioners for the driver, front passenger and rear seat outer passengers and the curtain shield airbag on the opposite side of the collision, based on lateral deceleration and rotation speed signals.

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    4. Primary Check Illumination Control


      1. After the power switch is turned on (IG), the airbag sensor assembly illuminates the SRS airbag 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 a malfunction is detected during the primary check, the SRS airbag warning light remains on even after the 6 seconds have elapsed.

      2. After the power switch is turned on (IG), the airbag sensor assembly operates the passenger AIRBAG ON/OFF indicator lights as shown below to check for an open in the indicator light circuits.

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  3. DIAGNOSIS


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

    2. The airbag sensor assembly outputs malfunction data and 5-digit Diagnostic Trouble Codes (DTCs) to the Global TechStream (GTS).

    3. The 5-digit DTCs can be read by connecting the Global TechStream (GTS) to the DLC3. For details, refer to the Repair Manual.

    4. If the SRS airbags deploy, the airbag sensor assembly will turn on the SRS airbag warning light. However, unlike an ordinary malfunction, a DTC will not be stored. The SRS airbag warning light cannot be manually turned off. It is necessary to replace the airbag sensor assembly with a new one.