General Motors announced a recall of more than 675,000 Chevrolet Cavalier and Pontiac Sunfire vehicles from the 1996 and 1997 model years for an airbag sensor defect.  Those vehicles use a Sensing and Diagnostic Module (SDM) that also serves as a “black box” for the airbag system.  Unfortunately, GM did not calibrate the software inside the SDM properly.

This safety sensor defect could result in the airbag sensor interpreting non-accident events as crashes requiring deployment.  In this kind of failure, even an impact to the underside of the car (such as from a rock) can fool the air bag sensor into thinking it was a serious crash and deploying the airbags.  There have also been reports of the airbags deploying without any significant impact at all.  If the airbag deploys while you are driving, it can shock you and even knock you out, causing an accident.  Of course, since the airbag already deployed, it is not there to protect you when you get into that accident.  The result can be serious personal injury or a wrongful death.

In such a case, you have to be prepared for GM’s argument that the air bag deployed during the accident, rather than before the accident.  There are ways to determine this by analyzing the internal (hexadecimal) data within the crash sensor and forensic marks from the accident, but it is a complicated process requiring engineering skills.  If this happened to you or a loved one, it would be helpful to hire an airbag lawyer who also has airbag engineering experience.  You need someone who can understand the complex issues in interpreting the black box data in General Motors vehicles, including the Chevrolet Cavalier and Pontiac Sunfire.

The government’s recall number is 98V-146.

Hyundai is recalling nearly 400,000 Hyundai Sonata vehicles from the 2006 to 2008 model years for defects in the Occupant Classification System (OCS) in the front passenger seat.  The OCS is intended to suppress airbag deployment in a crash if it determines that a small child is in the front passenger seat.  However, this safety defect also shuts off the airbag system if a small stature adult is sitting in that seat.  If that happens, airbag deployment will not occur for the adult, which could cause significant personal injuries or a wrongful death.

The government’s recall number is 08V-161.

Nissan is recalling nearly a quarter-million Nissan Pathfinder, Nissan Frontier and Nissan Xterra vehicles from the 2005 to 2009 model years.  The front airbag sensor is not sealed properly, and can rust on the inside.  This can cause the driver and passenger air bags to fail to deploy during a crash.

This recall applies only to those vehicles in certain “salt belt” states, primarily in the Northeast, Midwest and Atlantic regions.  Owners of these vehicles in the other states get only an extended warranty and a sticker for their warranty booklet, but no mandatory replacement of the safety sensor.  The government’s recall number is 08V-690.

3 Questions to Ask Before Determining if an Airbag Caused Injury or Wrongful Death

Although airbags are intended as a safety device, government documentation confirms they have caused significant trauma during vehicle accidents and are responsible for hundreds of wrongful deaths.

This shouldn’t come as a major surprise, given airbags deploy at speeds sometimes exceeding 200 mph. After experiencing an airbag deployment, many consumers say the airbag appeared to explode and compare the sound to a shotgun blast.

When questioning an airbag’s performance during a vehicle accident, you should analyze 3 critical questions before determining its role in contributing to serious injuries or wrongful death.

Question #1: Should the airbag have deployed?

Deployment depends on many factors, including your type of airbag. If it did not deploy and should have, you may have a “failure to deploy” or “non-deployment” case. In such a situation, the airbag would have deployed if the airbag crash sensor or other components had not failed.

One reason for deployment failure is a crash sensor malfunction due to faulty wiring that connects the crash sensor to the electronic control unit. Sometimes airbags don’t deploy because the car company did not conduct adequate crash tests when designing the airbag crash sensor.

In fact, many airbag systems sold to consumers were never tested in car-to-car crash tests, even though such crashes occur every day.

If the passenger airbag deployed, but the driver airbag did not deploy, the vehicle may contain a defective “clockspring” or coil. This electrical device installed in the steering column beneath the driver airbag transmits an electrical current to deploy the driver airbag. Reasons for a malfunction include design defects, inadequate testing, improper installation and improper adjustment.

In some cases, a passenger airbag will not deploy even though the driver airbag deployed and a passenger was sitting in the seat. This often occurs when a passenger presence detection sensor doesn’t work properly.

If the airbag deployed, but should not have deployed, you may have an “inadvertent” or unwarranted low-speed deployment. These can occur because of airbag sensor or other electrical defects.

Unfortunately, some manufacturers used inappropriate sensor combinations that are overly susceptible to low-speed, localized impacts, such as a vehicle striking a pothole or curb. Other sensor systems fail to detect crashes into a pole or tree. This may be the result of not having enough crash sensors due to excessive cost-cutting at the car companies.

Question #2: Did the airbag deploy late?

When an airbag opens late, impact occurs at a closer range. The extreme force can cause catastrophic injuries, even though late deployments often occur in minor accidents.

Late deployments can often be prevented using additional sensors and/or changes to the algorithms of electronic sensors. In some cases, the vehicle’s “black box” can confirm a late deployment took place.

Question #3: Did the airbag have specific crash safety features?

Crash safety features are added to airbags to reduce the risk of injury during deployment. These include items such as airbag inflators that inflate less forcefully, tethers that significantly reduce “bag slap” injuries, and vents that decrease pressure inside the airbag.

An investigation into these features is necessary to determine if manufacturing defects and quality control problems caused or contributed to your injuries.

In addition to crash safety features, the airbag system must also work together with the other parts of the car. For example, airbag crash sensors depend on the vehicle having a good structure or frame so the signal is received soon enough to avoid a late deployment.

Also, the instrument panel (I/P) or “dash” needs to be designed so that the knees and legs are not injured, while keeping the body properly positioned. And, when the airbag deploys, it must not create additional hazards for other components. For example, some passenger airbags are known to shatter the dash and send the pieces flying toward the passenger at high speeds.

You should get answers to these questions for any potentially defective front, side, curtain or rollover airbags. You deserve a safe and effective airbag during any type of a crash.

Although the process leading to airbag deployment has become more technical over the years, the airbag safety sensors’ job has remained the same.

In earlier vehicles, these airbag sensors were basic switches that responded to changes in velocity as the vehicle slowed down during the crash. Once two sensors “closed” to confirm a crash was taking place, electrical current was allowed to flow to the airbag modules.

In newer vehicles, electronic sensors measure a vehicle’s deceleration (negative acceleration), process it mathematically through a computer algorithm, and then compare the measured values to the values stored inside it from crash testing. If the measured values indicate the crash is more severe than the stored crash tests, the control module allows electrical current to flow to the airbag modules.

Once the electrical current flows to the airbag modules, it heats up a “squib” within the inflator that has a small filament inside a container of chemically explosive or flammable material. Once the filament gets hot enough, the chemicals begin burning. This sets off a larger reaction of a chemical called sodium azide within the inflator, which rapidly produces nitrogen gas, along with numerous byproducts.

In some vehicles, the sodium azide inflator was replaced with an inflator using pressurized gas, usually a combination of helium and argon. With either type of inflator, the gas from the inflator then fills the fabric airbag that was folded over the inflator.

As the gas fills the airbag, it increases in size, eventually breaking out from behind its plastic cover and inflating to its maximum size. Driver airbags are generally shaped like a round pancake – just larger than the diameter of the steering wheel – and are normally about 12 to 20 inches thick when filled. Passenger airbags are generally about 2 to 3 feet wide, and fill the space between the passenger and the dash or windshield.

Since passenger airbags are usually 2 to 4 times larger than driver airbags, they require a more forceful inflator to fill that larger size in the same amount of time.

For frontal airbags, the process of sensing the crash and inflating the airbags is usually over in less than one-tenth of a second. As the forces of the crash propel the driver/passenger forward into the airbag, it begins to absorb the energy by compressing and letting some of the gas out through the fabric or through specially designed vent holes.

This explains why many people involved in a vehicle accident in which airbags deployed remember the distinct chemical odor of the inflation gas and seeing smoke in the car.

For side airbags and rollover airbags, the process is similar. A sensor in the side structure of the car, or sometimes inside the front door, detects the rapid deceleration from the side or the vehicle beginning to rotate upwards during a rollover crash. Electrical current is then sent to the side airbags or to the rollover airbags (depending on the type of crash), which causes those airbags to deploy. Although the chemicals and gases may be different than for front airbags, the inflation process is very similar.