Airbag System System Description

FRONTAL COLLISION

1. The driver airbag and front passenger airbag are designed to supplement seat belts in the event of a frontal collision in order to help reduce shock to the head and chest.
   

2. Frontal collisions are detected by the center airbag sensor and two front airbag sensors. The driver airbag, front passenger airbag and seat belt pretensioners then operate simultaneously.
   

SIDE COLLISION

1. The front seat side airbags and curtain shield airbags are designed to help reduce shock to the driver, front passenger and rear outer passengers in the event of a side collision.
   

2. Side collisions are detected by the side airbag sensor installed in the bottom of the center pillar, door side airbag sensor* installed on the bottom of the front door and the rear airbag sensor installed in the bottom of the rear pillar.
   

3. Front side collisions are detected by the side airbag sensor and door side airbag sensor*, causing the front seat side airbag and curtain shield airbag to deploy simultaneously. Rear side collisions are detected by the rear airbag sensor to deploy only the curtain shield airbag.
   

FRONT AIRBAG SENSOR

1. The front airbag sensors are installed on the right and left radiator supports respectively.
   

2. The front airbag sensor uses an electrical type deceleration sensor.
   

3. The deceleration sensor is built into the front airbag sensor, and the distortion that is created in the sensor is converted into an electric signal based on the vehicle deceleration rate during a frontal collision. Accordingly, the extent of the initial collision can be detected in detail.
   

SIDE AIRBAG SENSOR

1. The side airbag sensors are installed on the bottom of the right and left center pillars respectively.
   

2. The side airbag sensor uses an electrical type deceleration sensor.
   

3. The deceleration sensor is built into the side airbag sensor, and the distortion that is created in the sensor is converted into an electric signal based on the vehicle deceleration rate during a front side collision. Accordingly, the extent of the initial collision can be detected in detail.
   

DOOR SIDE AIRBAG SENSOR*1

1. The door side airbag sensors are installed on the bottom of the right and left front doors respectively.
   

2. The door side airbag sensor uses an electrical type deceleration sensor.
   

3. The deceleration sensor is built into the door side airbag sensor, and the distortion that is created in the sensor is converted into an electric signal based on the vehicle deceleration rate during a front side collision. Accordingly, the extent of the initial collision can be detected in detail.
   

REAR AIRBAG SENSOR

1. The rear airbag sensors are installed on the right and left rear pillars respectively.
   

2. The rear airbag sensor uses an electrical type deceleration sensor.
   

3. The deceleration sensor is built into the rear airbag sensor, and the distortion that is created in the sensor is converted into an electric signal based on the vehicle deceleration rate during a rear side collision. Accordingly, the extent of the initial collision can be detected in detail.
   

CENTER AIRBAG SENSOR ASSEMBLY

1. General
   

   1. The center airbag sensor assembly is installed on the center floor under the instrument panel.
      
   2. The center airbag sensor assembly consists of a deceleration sensor, safing sensor, ignition control circuit, diagnostic circuit, etc.
      
   3. The center airbag sensor assembly receives signals from the deceleration sensor and safing sensor built into the center airbag sensor assembly and front airbag sensors, and determines whether the driver airbag, front passenger airbag, and front seat belt pretensioner should be activated. In addition, the center airbag sensor assembly diagnoses system malfunctions.
      
   4. The center airbag sensor assembly receives signals from the deceleration sensor and the safing sensor built into the center airbag sensor assembly, the side airbag sensor, door side airbag sensor* and the rear airbag sensor, and determines whether the front seat side airbag and the curtain shield airbag should be activated. In addition, the center airbag sensor diagnoses system malfunctions.
      
   5. The center airbag sensor assembly sends the airbag deployment signal to the ECM via CAN (Controller Area Network) communication to operate the fuel pump control.
      

2. Deceleration sensor and ignition control circuit
   

   1. A deceleration sensor is built into the center airbag sensor assembly, front airbag sensors, side airbag sensors, door side airbag sensors* and rear airbag sensors, and the distortion created based on the deceleration of the vehicle during a frontal, front side or rear side collision is converted into an electric signal.
      
   2. The ignition control circuit performs calculations based on the signal output from the deceleration sensors of the center airbag sensor assembly, front airbag sensors, side airbag sensors, door side airbag sensors* and rear airbag sensors. If the calculated values are greater than the specified values, it activates an ignition operation.
      

3. Safing sensor
   The safing sensor is built into the center airbag sensor assembly. When a frontal, side or rear collision occurs, the sensor turns on and outputs an ON signal to the center airbag sensor assembly if the deceleration rate sent to the safing sensor is greater than the specified value.
   

4. Backup power source
   The backup power source consists of a power supply capacitor and a DC-DC converter. If the power system is not functioning during a collision, the power supply capacitor discharges and supplies electric power to the SRS system. The DC-DC converter operates as a boosting transformer when the battery voltage falls below a predetermined level.
   

5. Diagnostic circuit
   This circuit constantly diagnoses system malfunctions. When a malfunction is detected, it turns on the SRS warning light on the combination meter assembly to inform the driver.
   

6. Memory circuit
   When a malfunction is detected in the diagnostic circuit, it is coded and stored in the memory circuit.
   

SRS WARNING LIGHT

1. The SRS warning light is located on the combination meter assembly. It comes on to inform the driver of system malfunction when it is detected in the self-diagnosis of the center airbag sensor assembly. Under normal operating conditions, when the ignition switch is turned to ON, it comes on for approximately 6 seconds and then goes off.
   

FRONTAL COLLISION

1. The center airbag sensor assembly determines whether ignition is necessary based on signals from the deceleration sensor and the front airbag sensors LH and RH*1. If the safing sensor turns on simultaneously, current flows to the squibs to deploy the SRS as shown in the illustration below.
   

   
   
   
   

   HINT:

   *1: In the case of a frontal collision, the ignition signal could be output with the deceleration sensor ON signal even without a signal from the front airbag sensors LH and RH.

SIDE COLLISION (1)

1. The front seat side airbag assembly is deployed based on signals from the side airbag sensor, door side airbag sensor* and center airbag sensor assembly.
   

   HINT:

   The curtain shield airbag assembly is deployed at the same time.

SIDE COLLISION (2)

1. The curtain shield airbag assembly is deployed when both of the following conditions is met:
   

   1. Signals from the side airbag sensor, door side airbag sensor* or rear airbag sensor are received.
      
   2. A signal from the center airbag sensor assembly is received.