Components

COMPONENTS









AIRBAG CONTROL MODULE




The airbag control module is installed inside the center console and contains a safety sensor, G sensor, ignition judgment circuit, and a backup power supply, etc.
The control module receives electric signals from the safety sensor and electric sensor inside the module and also from the front sub sensor to detect the deceleration of the vehicle and judge whether the airbag and pretensioners should be ignited or not. It also has a self diagnosis function which lights up the airbag warning light in the combination meter if a fault occurs in the system. Diagnostic trouble codes generated by the self diagnosis function are stored in the memory in the module.

To prepare for battery voltage fall in an event of an accident, the control module is provided with a backup power supply.
- Safety sensor
Inside of the sensor there is a mass weight, which works as a pendulum; if the sensor detects an impact acceleration exceeding a certain limit, the mass weight in the sensor moves to close the contacts and turn the switch ON.
- G sensor
Inside of the sensor there are comb-teeth shaped electrodes; in case of a collision the distance between the electrodes varies by the impact to enable detection of the impact acceleration.

DRIVER'S SEAT AIRBAG MODULE




The driver's seat airbag module is built in the steering wheel pad.
The SRS airbag module assembly cannot be disassembled. The driver's seat airbag module assembly consists of an inflator and airbag, and a steering wheel pad.




The inflator houses igniters and gas generating agents in a metal container. Igniters and gas generating agents are placed at two locations, and a 2-stage inflator which controls the airbag inflating speed according to the magnitude of impact at a collision is used. If the impact detected by the airbag sensor is equivalent to the level detected at a high speed, sudden collision, the two gas heating agents are ignited simultaneously. If the event of a collision at low or mid speed, the ignition of the 2nd stage gas generating agent is delayed to reduce the output of the inflator. Thus the inflator outputs power suitable for the severity of collision and relieves the impact to the passenger's head or upper body.

PASSENGER'S SEAT AIRBAG MODULE




The front passenger's seat SRS airbag module assembly is built in the instrument panel at the front passenger's side.
The SRS airbag module assembly cannot be disassembled. The front passenger's seat airbag module is fixed to the steering support beam, and consists of an inflator and an airbag.




The inflator houses igniters and gas generating agents with a metal container. Igniters and gas generating agents are placed at two locations, and a 2-stage inflator which controls the airbag inflating speed according to the magnitude of impact at a collision is used. If the impact detected by the airbag sensor is equivalent to the level detected at a high speed, sudden collision, the two gas generating agents are ignited simultaneously. If the event of a collision at low or mid speed, the ignition of the 2nd stage gas generating agent is delayed to reduce the output of the inflator. Thus the inflator outputs power suitable for the severity of collision and relieves the impact to the passenger's head or upper body.

SIDE AIRBAG MODULE




The side airbag modules are built in the backrest of left and right front seats (at the door side).
The SRS side airbag module assembly cannot be disassembled. The side airbag module is fixed to the seat frame with a bracket, and consists of an inflator, airbag, and a case.
If a side-on collision occurs, the inflator produces a certain amount of gas to inflate the airbag in a very short time in response to the ignition signal from the side impact sensor.

CURTAIN AIRBAG MODULE




The curtain airbag modules are placed at the front pillars, roof sides, and the rear pillars.
The SRS curtain airbag module cannot be disassembled. The curtain airbag modules are fixed to the vehicle body with a bracket and clips, and consists of an inflator and an airbag.
If a side-on collision occurs, the inflator produces a certain amount of gas to inflate the airbag in a very short time in response to the ignition signal from the side airbag sensor and curtain airbag sensor.

STEERING ROLL CONNECTOR




The steering roll connector is in between the steering column and the steering wheel, and contains a spirally wound flat cable.
The flat cable maintains connection between the airbag module on the steering wheel and the airbag harness even when the steering wheel is turned. Ignition signal from the airbag control module is sent through the roll connector to the driver's seat airbag module.

SEAT BELT PRETENSIONER




The driver's and front passenger's seat belt retractors contain a seat belt pretensioner.

The airbag control module controls the operation of the seat belt pretensioner. If the front sub sensor and the sensors inside the airbag control module detect an impact exceeding a specified level, the driver's seat and front passenger's seat airbags are deployed almost simultaneously. Upon receiving signals from the airbag control module the gas generator inside the pretensioners are ignited and the gas pressure retracts the seat belts in a very short time to improve the passenger restraint effect.

If the load placed on a seat belt exceeds the predetermined level, the torsion bar is twisted to allow the seat belt to be pulled out, thus lessening the load imposed on the belt wearer's chest.
Once the seat belt pretensioner has been activated, the seat belt retractor remains locked.

FRONT SUB SENSOR




The front sub sensor is installed to the tip of the front side frame.
If it detects an impact exceeding the specified level from the front, it sends a signal which is used for airbag system deployment judgment to the airbag control module.
To judge the impact to the front of the vehicle more precisely, the sensor is changed from the conventional pendulum type mechanical sensor to an electronic sensor.

SIDE IMPACT SENSOR




The side impact sensors (side airbag sensor, curtain airbag sensor) are installed at the bottom of the center pillars and the rear quarter pillars.

If the sensor in the side impact sensor detects an impact exceeding the specified level from the side, it sends a signal which is used for airbag system deployment judgment to the airbag control module.

Signals from the side airbag sensors are effective for both the side airbags and curtain airbags, while signals from the curtain airbag sensors detect impact to the rear seat sides and let only the curtain airbags deploy.

AIRBAG WARNING LIGHT




The airbag warning light is located inside the combination meter. It illuminates if a poor connection in the airbag circuit occurs, or if the airbag control module detects an abnormal condition. When the airbag system is normal, this light comes on when the ignition switch is turned ON and then goes out about 6 seconds later.

WIRING HARNESS
The airbag harnesses are integrated into the body harness as follows:
- Front sub sensor harness: integrated into the front harness.
- Airbag main harness: integrated into the bulkhead harness.
- Pretensioner and side airbag harnesses: integrated into the rear harness.