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Old 07-09-2016, 04:32 PM   #1
h018871
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Airbag Deployment when Seatbelt not Latched?

Does anyone know if the SIR System functions any differently if the seat belts are connected or not?

The reason for the question is: when at the track, I run the harnesses with the OEM belts unlatched. If in a wreck, I'd still like the bags to function as designed. I realize that the belt retractor would be ineffective, but that's not a concern because the harness already have you all the way back.
I'm debating whether to install a switch to fool the SDM to think they are connected while at the track.......although I'm not real keen modifying the factory safety items in place.

Apologies if already discussed, I didn't see it in my search
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Old 07-09-2016, 05:16 PM   #2
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From my understanding, it will deploy the airbags in a slightly different manner and timing, to try to compensate for the driver being unrestrained. It knows you're there in the seat, due to the occupancy sensor.
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Old 07-09-2016, 08:29 PM   #3
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I've looked at the wiring diagram and read the system description in the service manual. Everything is controlled by the SDM, the manual treats it as a black box. There's no mention of the logic used outside of the impact severity and the driver's seat position.
Thx and I agree with your logic captain, I'd like to think that it is not made inactive if the belt is not latched
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Old 07-09-2016, 09:13 PM   #4
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Instead of a switch, get the insert end of a seatbelt from a junkyard that will fit the Camaro buckle. With it inserted in the buckle the system will think you have the belt on. You can also do a search on-line. There are companies that make an insert you can buy.
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Old 07-10-2016, 08:15 AM   #5
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When I was reading on Schroths website about their 3 and 4 point connection harnesses for use with factory restraint receptacles they mentioned that an advantage to using their system is since they use the factory receptacles the air bags will deploy at normal rates. If the vehicle doesn't think you are belted in they said the air bags will deploy faster/harder. So it sounds like it would be best to have something to plug into the OEM female receptacle to retain normal air bag deployment functionality.
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Old 07-10-2016, 09:04 AM   #6
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Why not just latch the seat bealt and then get in? I never tried that with the camaro, but have with others.

Just a thought.
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Old 07-10-2016, 09:24 AM   #7
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although I can't verify the speed and rate of the air bag deployment while running aftermarket seats and 6 points. I hit head on while slightly offset towards the drivers side, and the drivers air bag and curtains deployed . I am not sure why the passenger air bag did not deploy, I can guess that has more to do with the seat weight sensor not being installed, therefore the system thought there was no occupant.
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Old 07-10-2016, 11:36 AM   #8
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My understanding is that the front bags are 2 stage, basically 2 gas generators in each bag. The SDM determines the severity and direction of the impact & decides the timing, which bag to activate & for the fronts, how many generators to fire.
I tried buckling the OEM belts, even went behind the seat. The male portion digs into my side & it is in the way of harness. It might be different if just the buckle and not the webbing. I'll search salvage yards and try that first. Failing that I'll add a switch.

summit1le, correct(my understanding), the pass bag won't deploy if the occupancy sensor is not triggered. I.E.: Activate the light above the mirror.
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Old 07-10-2016, 10:44 PM   #9
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For like $5 bucks on Ebay or Amazon you can guy a seatbelt dummy plug. It is what I am using in my z/28 and and what I have used in previous cars where I have installed a harness for the track. Much easier then trying to rewire things.
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Old 07-11-2016, 01:10 PM   #10
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If you go to your chevy dealership parts department and tell them you need a seatbelt extender and give them your vin number they will order you one, thats what i did.
when I got it i cut the end off. I plug it in when Im using my 6 point harness. there was no cost from the dealership for the extender.
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Old 07-12-2016, 09:01 AM   #11
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Quote:
Originally Posted by MRBZ28 View Post
If you go to your chevy dealership parts department and tell them you need a seatbelt extender and give them your vin number they will order you one, thats what i did.
when I got it i cut the end off. I plug it in when Im using my 6 point harness. there was no cost from the dealership for the extender.
I like free! I'll try this first, thx for the tip

EDIT: called the dealer, got two on order.........free / perfect!
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