AIRBAG SYSTEM DETAILS


  1. FUNCTION OF MAIN COMPONENTS


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

      Component Function
      Center Airbag Sensor Assembly

      • The center airbag sensor assembly receives signals from the deceleration sensor, the safing sensor built into the center airbag sensor assembly and one of the front airbag sensors, determines whether the driver airbag and front passenger airbag assembly*1 should be activated, and diagnoses system malfunctions.

      • The center airbag sensor assembly receives signals from the deceleration sensor, the safing sensor built into the center airbag sensor assembly and the side airbag sensor assembly, determines whether the front seat side airbag assembly and curtain shield airbag assembly should be activated, and diagnoses system malfunctions.*2

      • The center airbag sensor assembly receives signals from the deceleration sensor, the safing sensor built into the center airbag sensor assembly and the rear side airbag sensor, determines whether the curtain shield airbag assembly should be activated, and diagnoses system malfunctions.*2
      Steering Pad (Driver Side Squib) These consist of an inflator, a bag, and so on. The inflator deploys gas in accordance with an expansion signal from the center airbag sensor assembly and deploys the bag.
      Front Passenger Airbag Assembly*1
      Front Seat Side Airbag Assembly*2
      Curtain Shield Airbag Assembly*2
      Front Airbag Sensor The front airbag sensor uses an electrical type deceleration sensor. Based on the deceleration of the vehicle during a frontal 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.
      Side Airbag Sensor Assembly*2 A deceleration sensor is enclosed in the side airbag sensor assembly and rear side airbag sensor. Based on the deceleration of the vehicle during a side or rear side collision, a distortion is created in the sensor and converted into an electrical signal.
      Rear Side Airbag Sensor*2

      Combination Meter Assembly

      - SRS Warning Light

      		 The SRS warning light turns on to alert the driver when the center airbag sensor assembly detects a malfunction in the airbag system.

      • *1: Models with SRS front passenger airbag

      • *2: Models with SRS curtain shield airbag

  2. OPERATING CONDITION


    1. If the impact of a collision is greater than the specified value, the SRS is activated automatically. The center airbag sensor assembly includes the safing sensor and deceleration sensor. The safing sensor is designed to turn on at a lower deceleration rate than the deceleration sensor.


      1. In case of a frontal collision, the center airbag sensor assembly determines whether airbag deployment is necessary based on signals from the deceleration sensor and the front airbag sensor. If the safing sensor turns on simultaneously, current flows to the squibs to deploy the SRS components as shown in the illustration below. However, a deployment ignition signal may be output with the deceleration sensor on signal even without a signal from a front airbag sensor.

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    2. In case of a side collision, the center airbag sensor assembly determines whether airbag deployment is necessary based on signals from the side airbag sensor assembly. If the safing sensor turns on simultaneously with the side airbag sensor assembly, current flows to the squibs to deploy the SRS as shown in the illustration below:*


      • *: Models with SRS curtain shield airbag

      A01EZ8WE01

    3. In case of a rear side collision, the center airbag sensor assembly determines whether airbag deployment is necessary based on signals from the rear side airbag sensor. If the safing sensor turns on simultaneously with the rear side airbag sensor, current flows to the squibs to deploy the SRS as shown in the illustration below:*


      • *: Double cab and extra cab models with SRS curtain shield airbag

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  3. CONSTRUCTION


    1. Steering Pad (Driver Side Squib)


      1. The inflator and bag are built into the steering pad.

        A01EZLZE01
        Text in Illustration
        *1 Bag *2 Inflator
        *a A - A Cross Section - -

    2. Front Passenger Airbag Assembly


      1. The front passenger airbag assembly is located in the upper section of the instrument panel of the front passenger seat.

      2. The front passenger airbag assembly consists of an inflator and a bag.

        A01EZ74E01
        Text in Illustration
        *1 Bag *2 Inflator
        *a A - A Cross Section - -

    3. Front Seat Side Airbag Assembly


      1. Front seat side airbag assembly is installed in the seat backs of the driver and front passenger seats. The front seat side airbag assembly is a one-piece design, consisting of an inflator and a bag.

        A01EZ9JE01
        Text in Illustration
        *1 Bag *2 Inflator
        *a A - A Cross Section - -

    4. Curtain Shield Airbag Assembly


      1. Curtain shield airbag assemblies are installed in the area close to the sides of the headliner. Each SRS curtain shield airbag assembly is a one-piece design, consisting of an inflator and a bag.

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        Text in Illustration
        *A Double Cab Models *B Extra Cab Models
        *C Single Cab Models - -
        *1 Inflator *2 Bag
        *a A - A Cross Section *b B - B Cross Section

  4. SYSTEM CONTROL


    1. Airbag for Frontal Collision


      1. There are 2 types of airbags for frontal collisions: steering pad (driver side squib) and front passenger airbag assembly. These airbags deploy simultaneously.

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


      1. The airbag for side and rear side* collisions contains front seat side airbag assembly and curtain shield airbag assembly.


        • With the airbag for side collisions, if the side airbag sensor assembly detects an impact, it informs the center airbag sensor assembly, which causes the front seat side airbag assembly and curtain shield airbag assembly to be deployed simultaneously.

        • With the airbag for rear side collisions, if the rear side airbag sensor detects an impact, it informs the center airbag sensor assembly via the side airbag sensor assembly, which causes the curtain shield airbag to be deployed.*


          • *: Except single cab models

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  5. DIAGNOSIS


    1. Summary


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


        • The center airbag sensor assembly outputs the malfunction data as 5-digit Diagnostic Trouble Codes (DTCs) to an intelligent tester II or the SRS warning light.

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    2. SRS Airbag System DTCs


      1. The 5-digit DTCs can be read after connecting an intelligent tester II to the DLC3.

      2. If the SRS airbag deploys, the center airbag sensor assembly will turn on the SRS warning light. However, in contrast to the ordinary diagnosis function, a DTC will not be stored. The SRS warning light cannot be turned off. After deployment, it is necessary to replace the center airbag sensor assembly with a new one.