The SRS consists of: a driver-side air chamber located in the center of the steering wheel and containing a folded airbag and an inflator unit; an air chamber on the front passenger side, located in the instrument panel and containing a folded airbag and a gas generator unit; side air chambers located in the driver and front passenger backrests and containing the folded airbags and gas generator unit. The SRSCM control unit is located on the floor of the vehicle and controls the airbag system and includes: an accelerometer, which detects vehicle deceleration; a spiral wire (spring) located in the steering column; electrical circuits and connectors. The coiled wire transmits the signal regardless of the position of the steering wheel.
The SRSCM determines the moment of impact based on information from the accelerometer, which constantly monitors the vehicle's acceleration.
The pyrotechnic gas generator converts the control electrical signal into an ignition signal, which causes the powder to decompose, inflating the airbag bag.
Only trained personnel should be allowed to service the airbags or SRS components. Extreme care must be taken when servicing the SRS to avoid injury to personnel due to unauthorized deployment of the driver or front passenger airbags.
Precautionary measures
Failure to properly deactivate or service the airbag system may result in unauthorized deployment of the airbags, causing serious injury. Also, improper servicing of the airbag system may result in the airbag not deploying in a collision.
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Before performing any maintenance, including removing or installing system components, carefully follow these guidelines.
1. Before servicing the air bag system, make sure that at least 30 seconds have passed since the ignition was turned off and the negative battery cable was disconnected. The air bag system is equipped with an emergency power source that allows the air bags to deploy if the battery cables are disconnected in an accident. The time during which the emergency power source supplies energy to the air bag system is 150 ms.
2. When disconnecting the wire from the negative terminal of the battery, the memory of the clock and sound systems is erased. Before starting work, extract information from the sound systems. After completing the work, set the time on the clock and reinstall the sound systems.
3. Symptoms of air bag system failure are difficult to verify, so diagnostic codes become the most important source of information when troubleshooting.
4. When troubleshooting the air bag system, check the fault codes stored in the memory before disconnecting the battery.
5. Do not use airbag replacement parts from other vehicles.
6. Do not disassemble or repair air bag system components.
7. If any SRS component has been dropped or has cracks, dents or other defects in the housing, bracket or connector, replace them with new ones.
8. After completing the work, check the airbag system.
In some cases, the air bag warning light circuit may be compromised by another circuit fault. Therefore, if the air bag warning light is constantly on, make sure that all DTCs are cleared from memory.
9. When carrying out electric welding work, be sure to disconnect the wire from the negative terminal of the battery.