AIRBAG SYSTEM

FUNCTION OF MAIN COMPONENTS

The main components have the following functions:

Component		Function
Airbag Sensor Assembly		In the event of a 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 side airbag, front passenger side airbag, driver knee airbag, curtain shield airbags and front seat belt pretensioners should be deployed. The airbag sensor assembly also diagnoses system malfunctions. In the event of a collision, the airbag sensor assembly receives signals from the side airbag sensor assembly or rear airbag sensor. 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 and curtain shield airbag assemblies should be deployed. The airbag sensor assembly also diagnoses 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	Driver Side Squib	The airbags are used as supplements to the seat belts to help reduce impact to the occupants.
Instrument Panel Passenger Airbag without Door Assembly	Front Passenger Side Squib
Lower No. 1 Instrument Panel Airbag Assembly	Driver Side Knee Airbag Squib
Front Seat Airbag Assembly LH/RH	Front Side Airbag Squib LH/RH
Curtain Shield Airbag Assembly LH/RH	Curtain Shield Squib LH/RH
Front Airbag Sensor LH/RH		Based on the deceleration of the vehicle during a frontal collision, a distortion is created in the sensor and converted into an electrical signal.
Side Airbag Sensor Assembly LH/RH		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 Airbag Sensor LH/RH
Front Seat Outer Belt Assembly LH/RH	Front Pretensioner Squib LH/RH	The front seat outer belt assemblies are used to help reduce impact to the occupants.
Airbag Cut Off Switch Cylinder Sub-assembly		The airbag cut OFF switch cylinder sub-assembly suspends the instrument panel passenger airbag without door assembly operation.
Telltale Light Assembly	AIRBAG OFF Indicator Light AIRBAG ON Indicator Light	The airbag ON/OFF indicator lights inform the occupants of the airbag cut off switch cylinder sub-assembly status.
Power Management Control ECU		The power management control ECU receives an airbag deployment signal from the airbag sensor during a frontal collision, side collision or rear side collision. The power management control ECU will shut down the hybrid system power supply by turning the System Main Relays (SMRs) off, in order to ensure safety.
Combination Meter Assembly	SRS Warning Light	The SRS warning light turns on to alert the driver when the airbag sensor assembly detects a malfunction in the airbag system.

SYSTEM CONTROL

Airbag for Frontal Collision
1. There are 5 airbags which deploy in the event of a frontal collision: the horn button assembly, instrument panel passenger airbag without door assembly, lower No. 1 instrument panel airbag assembly and curtain shield airbag assemblies. In addition, the front seat belt pretensioners contained in the front seat outer belt assemblies LH and RH are also activated.
2. Deceleration sensors used for the airbag system are installed on various parts on the vehicle and calculate the deceleration (or acceleration) rate of each part during a collision.
3. Depending on the situation, the airbag sensor assembly sends a deployment signal to each airbag based on the information from each sensor.
4. 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 to deploy all airbags except the side airbags.
Airbag for Side/Rear Side Collision
1. There are 2 airbags which deploy in the event of a severe side collision: the front seat airbag assembly and curtain shield airbag assembly. These airbags deploy simultaneously. Additionally, at the same time, the front seat outer belt assembly is also activated.
2. For a side collision, if the side airbag sensor assembly detects an impact, it informs the airbag sensor assembly, and the airbag sensor assembly causes the front seat airbag assembly and curtain shield airbag assembly to deploy simultaneously with the pretensioner (front seat outer belt assembly LH or RH).
3. For a rear side collision, if the rear airbag sensor detects an impact, it informs the airbag sensor assembly via the side airbag sensor assembly, and the airbag sensor assembly causes the curtain shield airbag assembly to be deployed.
4. The front seat airbag assemblies are deployed and the front seat belt pretensioner in the front seat outer belt assembly LH or RH is activated based on signals from the side airbag sensor assemblies and airbag sensor assembly.
5. The curtain shield airbag assemblies are deployed based on signals from the rear airbag sensors or the side airbag sensor assemblies, and the airbag sensor assembly.
Primary Check Illumination Control
1. After the power switch is turned on (IG), 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 a malfunction is detected during the primary check, the SRS 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 airbag ON/OFF indicator lights as shown below to check for an open in the indicator light circuits.

DIAGNOSIS

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 warning light.
The airbag sensor assembly outputs the malfunction data and 5-digit Diagnostic Trouble Codes (DTCs) to the Global TechStream (GTS).
The 5-digit DTCs can be read after connecting the Global TechStream (GTS) to the DLC3. For details, refer to the Repair Manual.
If the SRS airbags deploy, the airbag sensor assembly will turn on the SRS warning light. However, unlike 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.