Air Bag 101 - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 8 Old 10-11-2010, 08:02 PM Thread Starter
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Exclamation Air Bag 101

I did a little searching around using the search feature but couldn't find what I was looking for so I'm just going to ask here.

I have a 09 Rubicon and just swapped out my front bumper with a Smittybilt stinger winch mount bumper. The only harnesses were for the factory fog lights.

I'm curious to know more about air bag deployment. The only reason I ask is because a guy was in our parking garage in his CRV last week. He was busy checking out my Jeep and turned his head while failing to realize there was a concrete support pylon right in front of him. He rammed it at 5 mph or so and his airbag deployed. Opps! He was burnt on his arms and got out of his car stumbling around dazed as if he just hit by Mike Tyson.

That little incident left me wondering... What happens a tree or obstacle (or mini cooper, slow Hummer in the fast lane or a midget) is in my way on the trail one night and I end up loosing my brakes... If I hit it with my stinger, is my air bag going to do the same thing? Where are the sensors? What's the speed and impact type that actually makes them deploy? If it was up to me, I'd be just as fine with no airbag in the JK... I've never thought the idea of a high pressure bag hitting me in the face just because it thought I ran into something a little too hard. I do understand why they are there... so no need to rant about how they save lives. yada yada yada.

Any insight on what makes them deploy, what types of forces, etc would be helpful.

Any stories about them deploying while on the trail would be some good reading too... Feel free to post them!

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post #2 of 8 Old 10-11-2010, 08:06 PM
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I don't believe they deploy in 4-low. However there are so many different variations of air bag systems out there it's hard to say what our particular Jeep Wrangler is running off of. Systems and specs can change by the year. Someone here may have the info, but I can't say that I think it's readily available...I'm curious as well.

What happens in a Jeep, Kia, Mercedes, Ford, will all be nearly completely different when it comes to safety systems. How they are designed, standards, triggering specifications, etc

I looked on all data, no sort of specs on there that I could find.

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Last edited by Goodysgotacuda; 10-11-2010 at 08:10 PM.
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post #3 of 8 Old 10-11-2010, 08:38 PM
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I'm pretty certain they deploy no
matter what.. If they were disabled in 4-lo the airbag light would come on just as the ESP does...


Pretty sure when you cut off the OEM crush cans you are actually making it easier for the airbag to deploy. The crush cans absorb small impacts lessening the g-force the air bag sensors sense. Of course that doesn't help if you hit a tree or boulder and it misses the crush can.

As far as I know the airbag system uses speed and rate of deceleration to determine wether the bags come out or not.

no jeep here...
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post #4 of 8 Old 10-11-2010, 08:55 PM Thread Starter
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I wonder if there are any actual Jeep engineers from Chrysler/Jeep on here that could clarify?

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post #5 of 8 Old 10-12-2010, 09:05 AM
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I thought deployment was controlled by an airbag control module like in the Cherokee and Liberty. This is a sensor, working on momentum changes, not physical impact. It is inside the vehicle, not on the bumper.
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post #6 of 8 Old 10-12-2010, 09:44 AM
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Quote:
Originally Posted by Vince1 View Post
I thought deployment was controlled by an airbag control module like in the Cherokee and Liberty. This is a sensor, working on momentum changes, not physical impact. It is inside the vehicle, not on the bumper.
I think you are right... Thought the sensor was somewhere around the console.

The sensor is not in the bumper at all, but like I said those crush cans lessen the forces the sensor sees when they crush. Basically
absorbing some of the impact. Of course I could be 100% wrong but it was my understanding.

no jeep here...
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post #7 of 8 Old 10-12-2010, 09:48 AM
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FWIW, (and I'm sure there are guys here that have done much worse) but I've beat the hell out my front & rear bumpers as well as the bash bar and my airbags have never deployed.

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post #8 of 8 Old 10-29-2010, 08:39 AM
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I skidded into a Honda Accord after going from 70-10 mph on the freeway. No airbag deployment.

Highway Patrol told me that it was speed related. Under 10-15 mph on impact=no deployment.

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