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airbags

Discussion in 'Electronic Repair' started by Andrey, Feb 17, 2004.

  1. They do from time to time. I believe Volvo had a problem a few years
    back where the static charge created by rubbing the dashboard (while
    cleaning it) set a few off.

    Airbags are equipped with shorting plugs so that when unplugged (for
    maintenance), the squib inputs are shorted, preventing detonations due
    to static.

    There are problems with fire or rescue personnel having them go off
    while they are leaning into wrecked cars, or side airbags being set off
    when they cut the roof off a car to
    extract injured occupants.
     
  2. I read in sci.electronics.design that Bob Kos <>
    I wasn't very pleased about it, either, when I read the warning in the
    instruction book of my Volvo.
    "If the front passenger compartment becomes flooded, the side airbags
    may deploy without warning, because the sensor is under the front seats.
    The vehicle must be towed to an authorised Volvo Service Centre."
     
  3. Bob Kos

    Bob Kos Guest

    I wonder who though up THAT design?? Single sensor deployment??? Am I
    reading that right??? And a sensor vulnerable to environmental
    contamination / false trigger. Fabulous. I'm again reminded why I don't
    like Volvos.

    Of course, I still maintain my reply to the OP. Air bags do not deploy for
    no good reason. Submerging your Volvo will apparently deploy the air bag.
    Not exactly a common, everyday occurence.
     
  4. Jim Thompson

    Jim Thompson Guest

    Flotation device?

    I always called my buddy's Volvo a Fluffo ;-)

    ...Jim Thompson
     
  5. I read in sci.electronics.design that Bob Kos <>
    Indeed, I haven't submerged the Volvo, yet. But I did flood a company
    Cortina by driving through flood water to my boss's house. The water was
    just an inch or two too deep, but I kept the engine running OK.
     
  6. Several other manufacturer reported unintended deployment
    of the airbag. When it happens on the freeway at 120km/h with
    10m distance to the next you're getting a problem.
    We're having reports over here on how to behave in the car.
    Eg for the co-driver, putting the feet up to the dashboard is
    a habit to better forget. Having a baby in the arms is considered
    irresponsible.

    Airbags do deploy by themselves.
    There might be a bug in the controlling electronics too.

    A colleague of mine had an upperclass car with distance warner.
    Intended to act on the break while parking in when the distance
    to the other car in front got sufficiently small. This electonics
    happend to act on the freeway at 120km/h. More than once.

    Rene
     
  7. RonKZ650

    RonKZ650 Guest

    Of course, I still maintain my reply to the OP. Air bags do not deploy for
    About 10 yrs ago, a friend of mine who drove a semi car hauler, bringing new
    cars out of Detroit swore that "quite often" the bags would deploy before they
    unloaded the cars at the dealer. This is a 60 yr old man that had no reason to
    make up stories out of the clear blue sky? Well maybe, but I'm still mighty
    happy driving my '62 Plymouth around.
    Ron
     
  8. James Sweet

    James Sweet Guest

    Hardly, I've spoken with two people who have had this happen, of course both
    were 10+ year old cars (IE the ones I'm interested in owning) that had the
    airbag control box located under the driver's seat. Sensor in that case is a
    simple accellerometer.
     
  9. James Sweet

    James Sweet Guest

    Yes, this is what I was referring to, and Volvo is certainly not the only
    car manufacture to use that setup, it's actually quite common.

    Thankfully though, the reinforced passenger cage, large crumple zone,
    collapsible steering column and driveshaft, breakaway engine mounts,
    spacious interior and good seatbelts make them damn safe even before the
    airbags came into play, the 240 still holds as one of the safer cars on the
    road, despite being designed nearly 3 decades ago and despite only the last
    couple years offering airbags. Ask any fireman, EMT, or insurance broker,
    most any of them will confirm this. If you design a car to absorb the force
    of the impact while not deforming the passenger compartment, and *if* the
    occupant(s) are properly belted into place, then the airbag will do no good.
    Of course I'm somewhat biased, I know a great many cars out there are built
    like tin cans, and in their case an airbag could concievably protect an
    occupant. I personally choose not to drive a flimsy car though.
     
  10. rgb

    rgb Guest

    Try that for fun next time you have the chance.

    Find a SAFE place with an ice lane and a clean lane (some empty parking
    lots are a good place for that).
    Try with both ABS an not ABS brake.
    Drive with one side of your car on the ice lane and try an emergency stop.

    :eek:)

    PS. some cheap ABS should not even exit (like one in 1990 Cavalier (low
    entry)), they were a pain ...

    PS.. Summer ABS no really needed !
     
  11. Bob Kos

    Bob Kos Guest

    Did the bags deploy while the cars were in transit - keys off, systems
    disabled? Or did they deploy when the ever-caring porters were
    moto-crossing brand new cars off the hauler?
     
  12. Bob Kos

    Bob Kos Guest

    It IS? Name another model that uses a single sensor deployment. I don't
    believe that.
    I agree. Drive a soup can and you'll die in it.

    However - if the market demands horsepower, handling, and affordability, the
    manufacturers will deliver. Perhaps at the expense of structural rigidity
    and crash worthiness. You get what you pay for.
     
  13. Bob Kos

    Bob Kos Guest

    It's similar to adding a little chlorine to the gene pool. Natural
    selection at its best....
     
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