What is a Seatbelt Pretensioner and How Does It Work?

A seatbelt pre-tensioner is designed to deploy during an auto accident and pull the passenger tighter into their seat. Every car owner should have an emergency cutter and glass breaker on their keychain or nearby amzn.to/42l0mpH to prevent getting trapped in their car after an accident or flood.
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The information provided in this video is for educational and informational purposes only and solely as a self-help tool for your own use. It is the responsibility of the viewer to First read the Technical Data Sheet, Material Safety Data Sheet, and any other instructions for each product, tool, or equipment used and to follow the safety recommendations of the manufacturer. DIY Auto Body and Paint assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. There are no warranties or guarantees of the results of the viewer after watching this video. The results will vary according to each individual's talents, knowledge, and skills.

[@s-c..]

So that’s what it is! Nice explanation & demo, thanks for that.

[@glengrimsdale4]

I really appreciate your video. Both tensioners are giving a fault code, and I did not know whether to change them or look deeper into the airbag light fault. I can definitely say my tensioners have not been activated. 👍🏼

[@meltdownblitz]

I have the same issue with the passenger front side. Did you end up replacing them?

[@mahmudsmith]

Thank you! No one else has explained this but appreciate more so the live demo!

[@SuperN1ntendoChalmers]

I agree about the not fixing these things. There are some things that should be replaced once they are used or even remotely faulty, and a seat belt pretensioner is definitely one of them. Thank you for the information.

[@prs1509]

Very helpful video, thanks for explaining and sharing.

[@marcelinopanypapa3984]

Wow, you learn something new everyday.

[@senorgiant1602]

I'VE BEEN WONDERING THIS FOR YEARS

[@wiredawg2005]

Wow, I never knew this, only searched this because of recall notice I recently received for 2021 Sante Fe Hybrid/Plug-in. I owned the Hybrid model, thanks for posting.

[@tonyjcool5314]

best detail on how a pretensioner works.

[@shawnpa]

Nice explanation..That's a beautiful car spin out.

[@TheALPHAMALE5028]

Thanks alot for the teaching on the seatbelt pretensioner. I have been wondering why my car shows fault code "Driver seatbelt tensioner too high". And i found out i was sold a car that was involved in an accident and the airbag was discharged so when they fitted new airbag, they did not replace pretensioner buckle.

[@thokozanipakkies]

Same boat. never knew what in gods name was that. remember being told when i bought my car that its fitted with this safety feature and i just said ok. never even asked to see it. Thanks for sharing

[@pigeon853]

I bought a car that had been crashed. The rear seat belts are locked up and this totally explains why! In theory, could you have a functioning seatbelt without pretensioners?

[@CarAddictGarage]

It is recommended to replace them. But they should still latch and hold.

[@allupro]

What's very likely is that the force limiters in the belts have also been activated. It's a torsionally flexible rod inside the seatbelt assembly, which will twist and deform during the collision to allow the webbing to spool out in a controlled way. Once it's been already deformed there's no guarantee that it wouldn't just snap in case of another collision, letting the seatbelt become completely loose.

[@Pjsev]

You learn something everyday! Mine are still good, it is in the wiring.

[@bigd9848]

Excellent information

[@solomonmapfumo3150]

Thanks buddy

[@boobalew]

Thanks for the video, Donny!

[@CarAddictGarage]

You're welcome...thanks for watching!

[@handyishrandyish334]

I had my seatbelt reset but did not send the buckle/pretensioners in mine do not have that gas charge like yours does does that mean it’s located elsewhere or that my buckle doesn’t have that function?

[@yuhaz]

Thx for shearing!

[@CarAddictGarage]

You're welcome....thanks for watching.

[@denizavc8833]

you are amazing thank you so much

[@chino3642]

I have a code 21-1 after a i did a interior swap there were no codes prior to swap on either car. I did forget to disconnect the battery before the swap any chance I would have cased this?

[@mfree9202]

How can you test if your pretensioner is faulty, WITHOUT using something like a multimeter?

[@timduddy1902]

There are two wires going to the pretensioner, does it matter which way round they fit to the underseat connector. Reason i ask is i have a replacement pretentioner with different coloured wires to the original.

[@TheAVMG]

Freaking loved the demo thanks

[@dblock2626]

Here from Ericthecarguys Body Fix video.. was going to sub but i couldnt. Turns out i had already subscribed lol good videos always deserve a like and subscribe.

[@CarAddictGarage]

Thanks for subbing! I really enjoy Eric The Car Guy's videos too.

[@SPARKYMAN1979]

Good video! Any insight on a B1431 code? Likely cause?

[@jocatlinvalenciano6899]

This is great news/trivia on safety in an automobile =) Plus the dude doing the demonstration has a great voice and attitude.

[@CarAddictGarage]

Thanks for watching

[@tatianagomes828]

Does It work when only curtain air-bag opens?

[@leblancexplores]

Thanks for sharing. Do you know what the signal these expect? Is it usually 12V, some CAN based signal or something else? I ask as I am curious how hard it is to retrofit another seat into my cargo van and have it still triggered by maybe the passenger seat in the event of an accident.

[@averyalexander2303]

I doubt that would work and wouldn't suggest trying it. Just like airbags, the pretensioners are triggered by the SRS module sending 12V at the exact time it's required. The problem is that the module is only designed to supply a certain amount of current and trying to fire two pretensioners off one output could overload the module and cause it to not work as intended. This may mean it might not fire either pretensioner at all or maybe it fires them too late.

[@luisvillar8320]

Thanks for the explanation, hope never have to use this.

[@drivenhome7840]

Those flames behind you are a premonition. Ford is pulling F150's for Seat Belt Pretensioner's for catching on fire.

[@SasukeEver]

Where can i buy them and how do i decide which one i should buy

[@CarAddictGarage]

They are an OEM part that is vehicle specific. It depends on the make and model of your car if it came with them from the manufacture.

[@braindeadnewyorker9569]

I saw Ericthecarguy video. Can you do something about rust

[@CarAddictGarage]

Yeah, I enjoy watching Eric The Car Guy videos too. He is awesome.

[@david1731048]

"Slow motion" **still the speed of light**

[@thewiseguy7100]

Actually seatbelt pretensioners are repairable..

[@WCSmith-vr3fx]

Nope. In theory they probably rebuildable, but I'm sure you don't have enough insurance to cover that as a completed operation.

[@logic_tonic9929]

@@WCSmith-vr3fx there are places that you can send in a broken seat belt and they will repair it

[@pono321]

@@WCSmith-vr3fx what? You don’t make sense.

[@pono321]

That’s correct! Seat belts and pretensioners are repairable, There’s plenty of places to send them in to get them fixed.

[@WCSmith-vr3fx]

If you’re repairing any single use safety item, check with your insurance carrier to understand that they will cover a loss when you get sued. If you are using rebuilt airbags/pretensioner in a repair instead of OEM and you’re not disclosing that to the customer AND the insurance company paying for the repair, that is morally reprehensible and likely criminally negligent. If you sell a car that you know has aftermarket or rebuilt airbags, and you don’t disclose it, you are amongst the worst of all humans.

[@TheCrankydragon]

lol did you just set off an explosive charge that was pointed straight at you

[@txm100]

You should have worn safety goggles.

[@nancycampbell4171]

Pĺp