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Understanding Air Bag Systems: Operation, Deployment, and Diagnostics

Air bag systems are vital for vehicle safety, deploying during crashes to protect occupants. In just 200 milliseconds, crash sensors detect impacts, and the integrated controller evaluates data to determine if deployment is necessary. After 16 milliseconds, automatic belt tensioners activate, followed by airbag inflators deploying on both the driver and passenger sides at 18 milliseconds. Proper diagnosis of air bag systems involves understanding flash codes and disconnecting the clock spring during servicing, often using a DVOM for pinpoint tests to locate faults.

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Understanding Air Bag Systems: Operation, Deployment, and Diagnostics

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  1. AIR BAG SYSTEMS

  2. AIR BAG SYSTEM

  3. Air Bag Systems How do they operate ?

  4. .200 of a Second and its Over • .00 sec. -crash initiated • .015 sec. -crash sensors have detected the impact.

  5. Intergrated Controller • .016 Controller evaluates crash sensor data and determines if the crash is severe enough for airbag deployment

  6. Inflation • .017 sec. Automatic belt tensioners activated. • .018 sec. Drivers side and passenger side inflators deploy .

  7. MOMENT OF TRUTH

  8. CLOCK SPRING ASSEMBLY

  9. CRASH SENSOR

  10. CRASH SENSOR

  11. AIR BAG CONTROL MODULE

  12. AIR BAG DIAGNOSIS • FLASH CODES USUALLY HARD CODE • MUST DISCONNECT CLOCK SPRING WHEN SERVICING AIR BAG SYSTEM • USUALLY PINPOINT TEST TO LOCATE FAULT. DVOM • POWERED UP FOR 15 MINUTES • MUST DISCONNECT POWER MODULE

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