Airbag deployment
Airbag deployment
Hi all.
Recently joined your forum and have a question (or 2) already. My daughter rearended a Tarago (am I allowed to say that here ) in her MY03 Liberty a little while ago. The crash did bend the front chassis rail, but did not set off the airbag.
I was looking on evilbay (amongst other places) for parts/wrecker to see if it was worth fixing. I found 2 others (Impreza and Outback) that had fairly substantial hits up the rear and in photos of the interior, no airbags were set off either. A 4th Liberty at the wreckers also had a big hit in the front and again, no airbag deployed.
My question(s) are, should the airbag/s have gone off and 2, if so has this happened to anyone else? and should I be asking "Subaru" itself some questions.
tks
Paul
Recently joined your forum and have a question (or 2) already. My daughter rearended a Tarago (am I allowed to say that here ) in her MY03 Liberty a little while ago. The crash did bend the front chassis rail, but did not set off the airbag.
I was looking on evilbay (amongst other places) for parts/wrecker to see if it was worth fixing. I found 2 others (Impreza and Outback) that had fairly substantial hits up the rear and in photos of the interior, no airbags were set off either. A 4th Liberty at the wreckers also had a big hit in the front and again, no airbag deployed.
My question(s) are, should the airbag/s have gone off and 2, if so has this happened to anyone else? and should I be asking "Subaru" itself some questions.
tks
Paul
- Brumby Kid
- General Member
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Hi welcome.
Ummmmmm. How hard was the crash? Dont car about speed, just was she hurt? Chassis Rails are ment to do that to absorb the shock.
Was she hurt? Any whiplash?
With a 5 star safety rating I really think that if it was hard enough they would have gone off.
If she was hard enough to hurt her ( and she doesn't bruise easily) and they didn't go off then I would be asking questions.
Cheers Cam
Ummmmmm. How hard was the crash? Dont car about speed, just was she hurt? Chassis Rails are ment to do that to absorb the shock.
Was she hurt? Any whiplash?
With a 5 star safety rating I really think that if it was hard enough they would have gone off.
If she was hard enough to hurt her ( and she doesn't bruise easily) and they didn't go off then I would be asking questions.
Cheers Cam
When life gives you a corner, drop a gear, pitch, and stomp the loud pedal
Bianca: 1991 Subaru Brumby
My First / Project car
EA81 Rebuilt by Tony Knight from knight Engines
2" body lift
25" 185r14 Yokahama Delivery Star, light truck tyres
2" Sports exhaust
Rear Aguip step/bar
Liberty seats
Mums Car 08 Liberty Wagon
Bianca: 1991 Subaru Brumby
My First / Project car
EA81 Rebuilt by Tony Knight from knight Engines
2" body lift
25" 185r14 Yokahama Delivery Star, light truck tyres
2" Sports exhaust
Rear Aguip step/bar
Liberty seats
"Bianca"
[SIGPIC][/SIGPIC]
Dads Car: 02 Impreza WRX STi[SIGPIC][/SIGPIC]
Mums Car 08 Liberty Wagon
chest and rib bruising. (she is altitude challenged and sits fairly close to the wheel) and a sore neck (aggravated by previous accident)
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- Brumby Kid
- General Member
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- Joined: Sun Jul 17, 2011 9:19 pm
- Location: Belair S.A.
Yeah car should look like that. Should see my mates dad's vl wagon. Hit a tree real hard almost died. Car held up really well.
What did insurance say? You should have many more problems than just the front of the body. If the chassis is well, rather fu(ked. Then do not fix it yourself!!! Talk to insurance, talk to a suby repairer. What was the cause?
I would expect that if she was too close to the wheel then she should have that. And if airbags did deploy they may not have worked too well.
Cheers Cam
What did insurance say? You should have many more problems than just the front of the body. If the chassis is well, rather fu(ked. Then do not fix it yourself!!! Talk to insurance, talk to a suby repairer. What was the cause?
I would expect that if she was too close to the wheel then she should have that. And if airbags did deploy they may not have worked too well.
Cheers Cam
When life gives you a corner, drop a gear, pitch, and stomp the loud pedal
Bianca: 1991 Subaru Brumby
My First / Project car
EA81 Rebuilt by Tony Knight from knight Engines
2" body lift
25" 185r14 Yokahama Delivery Star, light truck tyres
2" Sports exhaust
Rear Aguip step/bar
Liberty seats
Mums Car 08 Liberty Wagon
Bianca: 1991 Subaru Brumby
My First / Project car
EA81 Rebuilt by Tony Knight from knight Engines
2" body lift
25" 185r14 Yokahama Delivery Star, light truck tyres
2" Sports exhaust
Rear Aguip step/bar
Liberty seats
"Bianca"
[SIGPIC][/SIGPIC]
Dads Car: 02 Impreza WRX STi[SIGPIC][/SIGPIC]
Mums Car 08 Liberty Wagon
Looks like a decent hit from the pics but no the airbags shouldn't of gone off. From where they are there isn't any damage.
There are only 2 airbag sensors on any Subie with front and passenger airbags (only 2). They are infront of oth front wheels in the fender guards attached to the chassis.
In the first pic I can just see one which is yellow where the bumper has been pushed forward.
If they haven't been damaged then they won't deploy. Luckily the car is wuite easily repairable.
There are only 2 airbag sensors on any Subie with front and passenger airbags (only 2). They are infront of oth front wheels in the fender guards attached to the chassis.
In the first pic I can just see one which is yellow where the bumper has been pushed forward.
If they haven't been damaged then they won't deploy. Luckily the car is wuite easily repairable.
- d_generate
- General Member
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- Location: Back in Perth and SORing it atm.
I've been buying and fixing Subi's for years, I look at the auctions most weeks and they do seem to take much more to get the bags to activate than most cars, good in most ways as the people wouldn't have been hurt badly if at all, I've seen Mercs and BMW's that look like they have just had a mild kick and all the bags have gone off making repairs much more than the initial little bump would have cost to repair or even made the car questionable to repair as the bags come to many many thousands to replace.
98 Libbo with V3 STI running gear. 13.0 @ 105mph with CAI & 3" Zorst:mrgreen:
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- El_Freddo
- Master Member
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In a crash the ECU (or one of them as the case may be) will do a split second calculation to work out if the air bags will be a benefit rather than a health hazard to the occupants. They are meant to be a life saving device and not a life ending one. Set off in the wrong conditions and they can kill you!
So I'd say that while the car sustained this much damage, it wasn't severe enough to deploy the air bags.
Cheers
Bennie
So I'd say that while the car sustained this much damage, it wasn't severe enough to deploy the air bags.
Cheers
Bennie
- Gannon
- Senior Member
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- Location: Bowraville, Mid Nth Coast, NSW
If you read up in the SRS air bag part of the owners manual, it describes what is likely to set off the air bags.
As stated above, the damage does not look severe enough to have to have damaged the sensors. Im pretty sure they are located at the front of the chassis rails, where the chassis rail meets the radiator support panel.
As stated above, the damage does not look severe enough to have to have damaged the sensors. Im pretty sure they are located at the front of the chassis rails, where the chassis rail meets the radiator support panel.
Current rides: 2016 Mitsubishi Triton GLS & 2004 Forester X
Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
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Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
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- littlewhiteute
- Junior Member
- Posts: 623
- Joined: Sat Sep 30, 2006 7:22 am
- Location: Brisbane
Not enough damage to deploy.
Airbags are deployed according to G-force above a certain minimum speed.
Some cars are G-force only, you could be stationary and have a car hit you at 100km/hr and YOUR airbag could deploy.
Crash sensors measure deceleration rate (Negative G force) and the module deploys the airbag accordingly. Damaging a crash sensor does not deploy the airbag.
Your car could also have a 2 stage airbag, and if your daughter sits close to the wheel this affects deployment strategy in the SRS module.
Airbags are deployed according to G-force above a certain minimum speed.
Some cars are G-force only, you could be stationary and have a car hit you at 100km/hr and YOUR airbag could deploy.
Crash sensors measure deceleration rate (Negative G force) and the module deploys the airbag accordingly. Damaging a crash sensor does not deploy the airbag.
Your car could also have a 2 stage airbag, and if your daughter sits close to the wheel this affects deployment strategy in the SRS module.
Regards
Gary
Gary
- sven '2'
- General Member
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I suggest that there are many other factors that the ECU considers before deployment. Is (near) impossible to suggest just looking at the end result to determine if the SRS AB should have deployed or not.
Vehicle postion, speed, decelerating or accelerating etc are just some of the inputs.
And as for sensors being disabled in a crash before deployment - a crash at high speed takes as little as 120ms compress the crumple zones - the trigger to deploy the airbags has already tripped in the first 90ms.
I would take my chances on a AB deploying over a steering wheel injury ANY day of the week.
Glad your daughter is ok.
Vehicle postion, speed, decelerating or accelerating etc are just some of the inputs.
And as for sensors being disabled in a crash before deployment - a crash at high speed takes as little as 120ms compress the crumple zones - the trigger to deploy the airbags has already tripped in the first 90ms.
I would take my chances on a AB deploying over a steering wheel injury ANY day of the week.
Glad your daughter is ok.
73 Yamaha DT3 250
08 Ford BF wagon - LPG FTMFW
14 Toyota Kluger - goodness!
08 Ford BF wagon - LPG FTMFW
14 Toyota Kluger - goodness!
we touch on it once during a physics lectuer at uni... an extremely simplistic way at looking at, (number of other parameters taking into account in reality) it takes about 20Gs for them to be deployed that is 20 times the acceleration of gravity around about 190 ms^2 of deceleration which is equivalent to breaking from 100 in well under half a second.. crumple zones in the front of cars are designed to collapse in stages under accelerations and forces far less then the airbag is needed for, airbags are pretty much your last hope.. so to answer your question, i'm not surprised it didn't go of and not surprised alot of cars with what have had some what serious weren't violent enough to trigger an airbag deployment...
"the wisest of men followed the stars"
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to do list:
-3" strut, 2" body lift uni mid-year break
If your daughter is altitude challenged and sits fairly close to the wheel be she should be thankful in one way that the airbag didn't go off.pop058 wrote:chest and rib bruising. (she is altitude challenged and sits fairly close to the wheel) and a sore neck (aggravated by previous accident)
A female friend of mine in Townsville is also altitude challenged and sits close to the wheel, she slid off a roundabout in wet weather doing 40 km/h and hit a lamp post smack amidships, she ended up with facial bruising and a broken sternum thanks to the airbag.
I have seen a Rent-A-Car Falcon where both airbags went off and both the driver and the passenger still left their head imprint in the windscreen, yes they died.
Peter
- Tweety
- General Member
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- Location: ea81 powered trike Victoria
Well airbags were a worry for me riding tweety.
If someone rear ended me.
But then I realised my misses being seated so close behind and a bit above me...I have the best airbags I've ever felt....
You go to Target and ask for size xxxxxxxx
If someone rear ended me.
But then I realised my misses being seated so close behind and a bit above me...I have the best airbags I've ever felt....
You go to Target and ask for size xxxxxxxx
[SIGPIC][/SIGPIC]Tweety trike- EA81 (full reco 2014) 32/36 weber, SPFI manifold, 9.5:1 CR, VW auto.
- Gannon
- Senior Member
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- Location: Bowraville, Mid Nth Coast, NSW
Photos or we dont believe you!Tweety wrote:I have the best airbags I've ever felt....
You go to Target and ask for size xxxxxxxx
Current rides: 2016 Mitsubishi Triton GLS & 2004 Forester X
Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
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Ongoing Project/Toy: 1987 RX Turbo EA82T, Speeduino ECU, Coil-pack ignition, 440cc Injectors, KONI adjustale front struts, Hybrid L Series/ Liberty AWD 5sp
Past rides: 92 L series turbo converted wagon, 83 Leone GL Sedan, 2004 Liberty GT Sedan & 2001 Outback
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