Construction
Construction
1. GENERAL
The SRS airbag consists of an airbag control module, left and right front sensors, safety sensor built into the control module, and an airbag module containing an inflator and airbag. The left and right front sensors and two safety sensors are connected in parallel respectively, and the front sensors and safety sensors are connected in series, so that the airbag will inflate if at least one front sensor and safety sensor sense an impact at the same time.
2. AIRBAG CONTROL MODULE
The airbag control module is installed ahead of the front floor tunnel. It detects the vehicle's deceleration by receiving electrical signals from the sensors and judges whether to fire the airbag. This control module has a built-in self-diagnosis function. If a trouble occurs inside the system, it lights up the airbag warning light in the combination meter. The trouble data is stored in the module. A back-up power supply is provided for possible damage to the battery during an accident, and a boosting circuit is built into the module in case of a battery voltage drop.
3. FRONT SENSOR
One front sensor is installed on both left and right sides ahead of the front wheel apron wall. If the rotary type sensor receives a frontal impact exceeding a certain set limit. The eccentric rotor rotates to turn the switch ON.
4. SAFETY SENSOR
Two safety sensors are built into the airbag control module. If the roller-might type sensor receives a frontal impact exceeding a certain set limit. The roller rotates to turn the switch ON.
5. AIRBAG MODULE
The airbag module is located at the center of the steering wheel, and it contains an airbag and inflator. If a collision occurs, the inflator produces a large volume of nitrogen gas inflating the nylon airbag in a very short time.
6. AIRBAG CONNECTOR
The SRS airbag adopts a connector which has a double lock mechanism and coupling error detection mechanism for enhanced reliability. If coupling is incomplete, the airbag warning light comes on in the combination meter
- Connector coupled to airbag control module
To disconnect the connector, press wire (1) of the control unit as illustrated below until the green lever (2) tilts up. This unlocks the double lock, then you can pull off the connector while pressing tile connector lock.
To couple the connector, insert the three connectors until a "click" is heard, then push in the green lever (2) to apply the double lock.
- Connector between harnesses
To disconnect the connector, press lever (1) to pop green lever (2) out, this unlocks the double lock system. Then separate the connector by pulling both sides while holding the connector sections and pressing in lever (1).
To couple the connector, insert both connectors until a "click" is heard, then push in the green lever (2) until a "click" is heard; this applies the double lock.
7. STEERING ROLL CONNECTOR
The steering roll connector is located between the steering column and steering wheel. A flat cable stored in a spiral form transmits the electrical signal from the airbag control module to the steering wheel from the body harness.
8. AIRBAG WARNING LIGHT
The airbag warning light is located inside the combination meter. It illuminates if a poor connection occurs, or if the airbag control module detects an abnormality, When the airbag system is normal, this light goes out approximately eight seconds after turning the ignition switch ON.
9. WIRE HARNESS
The wire harness of the SRS airbag is entirely covered with a yellow protective tube, and can easily be identified from harnesses of other systems.
Warning And Caution Labels (Part 1):
Warning And Caution Labels (Part 2):
10. WARNING AND CAUTION LABELS