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+--- Thread: airbag help (FAO Cully) (/showthread.php?tid=8180)
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airbag help (FAO Cully) - Niall - 20-11-2012
im in the process of fitting some rx8 front seats to my ph3 which means losing the airbags and bringing the light on on the dash. obviously easiest way is to remove the bulb, or get a resistor for the plugs but the rx8 seats have side air bags so i would like to get these working if possible. Im a bit worried about just wiring them up. obviously at best, it will bring the light on. worst, it will blow all the airbags as soon as i start the car.
Does anyone know A) the monitoring and firing resistance of the original air bags and B) same for the rx8 ones or a way to measure them.
Mainly im looking at you cully as your version of auto data seems to have much more information than mine!
RE: airbag help (FAO Cully) - samass - 20-11-2012
75 ohms.
RE: airbag help (FAO Cully) - Niall - 20-11-2012
(20-11-2012, 09:12 PM)samass Wrote: 75 ohms.
f*ck off! next your going to be telling me 230v is also safe to put through it yeah?
airbag help (FAO Cully) - Jonny b - 20-11-2012
Ha ha
RE: airbag help (FAO Cully) - samass - 20-11-2012
no, of course not, that'd be retarded. however, 110v would be fine.
RE: airbag help (FAO Cully) - Niall - 20-11-2012
jonny you got any input on this being a electrical geek?
airbag help (FAO Cully) - Jonny b - 20-11-2012
Never looked at an airbag circuit before,
As you know you can put a resistor inline to turn the light off, as for having them work! Would have to look at both circuit diagrams, can't see there being to much difference to the triggering of them, but the sensors and that? Without looking I wouldn't comment
RE: airbag help (FAO Cully) - Niall - 20-11-2012
i know that the sensors wont make a difference. both the rx8 and 306 have single stage deployment so its not really a problem. All im concerned about is the monitoring voltage of the 306 airbag is higher than the firing voltage of the rx8 airbag. cant find a huge amount of info online about them and as you can understand, dont want to put a multimeter across it! luckily, the rx8 ones are under a plastic cover instead of under the cloth so might see if i can get a spare and measure it.....from a long long way away!
airbag help (FAO Cully) - Jonny b - 20-11-2012
What info have you got bud?
RE: airbag help (FAO Cully) - Niall - 20-11-2012
not much really. All i know is the controller sends out 2 voltages. a monitoring voltage and firing voltage. What these are i really dont know and what resistance the airbag is i also dont know. theres no reason why i cant measure the voltage coming from the controller (i highly doubt even if i put 12v down this, it would set the airbags off. they must have some form of short circuit protection?) but what voltage it requires back i dont know!
tbh im never going to know if it will go off with the 306 controller unless i crash it. problem is, mot testers will be checking factory fitted airbags and these are obviously not factory so dont want to give them an excuse!
airbag help (FAO Cully) - Jonny b - 20-11-2012
Let me have a bit of a think when I haven't had a couple of beers, ill get back to you if we knew the values of both systems it would be a peice of piss to replicate
RE: airbag help (FAO Cully) - Niall - 20-11-2012
(20-11-2012, 10:29 PM)Jonny b Wrote: Let me have a bit of a think when I haven't had a couple of beers, ill get back to you if we knew the values of both systems it would be a peice of piss to replicate
yeah. gutted i binned a spare 306 side airbag at the weekend! will do more research but i think cully may have the resistances on auto data
airbag help (FAO Cully) - Jonny b - 20-11-2012
The info must be out there as code readers must measure systems in some way to bring up faults
RE: airbag help (FAO Cully) - rocker8742 - 20-11-2012
Find a spare rx8 seat and turn the voltage up with a variable supply slowly until it blows so you know the triggering voltage?
From a distance of course not sat on the seat
RE: airbag help (FAO Cully) - Niall - 20-11-2012
(20-11-2012, 10:41 PM)Jonny b Wrote: The info must be out there as code readers must measure systems in some way to bring up faults
yup somewhere! not in any rush but would like the idea of they may go off if someone tbones me instead of just knowing they won't!
RE: airbag help (FAO Cully) - cully - 20-11-2012
12v will set an airbag off i have done this on a bench for giggles
the checking circuit measures the resistance of the firing charge this is probably done with a pulsed very low voltage <5v
the firing voltage is probably up to constant 12-35v
measure the voltage that your multimeter reads Ohms @ if it is very low id measure the resistance of the bags and see if they match if they dont you could add resistors to bring the Rx8 seats to the correct value
this is my opinion none is based on fact other than the first line
(20-11-2012, 10:41 PM)Jonny b Wrote: The info must be out there as code readers must measure systems in some way to bring up faults
its a little more complexed than you think
the air bags are controled by an ECU so it is all computer controlled
the code readers just read the stored data in the chip not info in any of the bags
RE: airbag help (FAO Cully) - Niall - 20-11-2012
yeah ive set airbags off with 12v. problem is though you get these people on other forums saying you can set them off with static if you touch the pins. possible? yeah. Probable? not really but you still worry!
when you say read the voltage my meter reads ohms at, do you mean set it to ohms then use another meter over the lines to see what its producing?
even if i discover the resistance of the airbags, do you still think it will be safe to read the voltage coming from the controller?
RE: airbag help (FAO Cully) - cully - 20-11-2012
yes use a second meter to read the voltage of the ohm meter
yes i believe static can set off a bag
if the detonators are the same resistance i would assume they used the same voltage
no i wouldn't read the voltage of the output with a multimeter
i would use an oscilloscope
oh and the monitoring voltage looks to be 4.6v but unsure if thats current limited
info comming from google
auto data has no info
service box has reams of safe deactivation/ reactavation/ plugging/unplugging info
but no voltages just says use diag equip
peugeot airbag ecu is looking for 1.6-2ohm for the stearing wheel bag
oh and me spellings getting worse as the beer bottles are emptying
airbag help (FAO Cully) - Jonny b - 21-11-2012
This ^^ is why I wouldn't comment without looking at the whole circuit, especially seeing as the pug design is rather old and an rx8 is quite new In comparison
RE: airbag help (FAO Cully) - Niall - 21-11-2012
Cheers for your help lads. Tbh I might just wing it and hook it up. What's the worst that can happen right?
airbag help (FAO Cully) - Jonny b - 21-11-2012
Awaits thread titled
Airbags hurt
Ha ha
RE: airbag help (FAO Cully) - Niall - 21-11-2012
(21-11-2012, 12:35 PM)Jonny b Wrote: Awaits thread titled
Airbags hurt
Ha ha
haha yeah tbh i think ill plug it in sitting in the back seat. cant hit me then lol.
what size resistor is needed to get rid of the light anyway? just incase i get bored of trying to work out if i can connect it up and just leave it as is?
RE: airbag help (FAO Cully) - Kwik - 21-11-2012
lmfao! they do oh they do
RE: airbag help (FAO Cully) - Niall - 21-11-2012
(21-11-2012, 09:14 PM)Kwik Wrote: lmfao! they do oh they do
really? ok ill extend the wiring to behind the garden wall and do it there! haha
RE: airbag help (FAO Cully) - Kwik - 21-11-2012
i accidently let off one think it was a vauxhall one and it made me blacker and tenderrer around my face. so now i always disconnect power and don't mess with them when they live lol
RE: airbag help (FAO Cully) - Niall - 21-11-2012
(21-11-2012, 09:28 PM)Kwik Wrote: i accidently let off one think it was a vauxhall one and it made me blacker and tenderrer around my face. so now i always disconnect power and don't mess with them when they live lol
yeah ive set them off before and they are quite scary tbh. See some of the damage they can do even when people are wearing a belt in a crash
RE: airbag help (FAO Cully) - Kwik - 21-11-2012
RE: airbag help (FAO Cully) - vincent1 - 22-11-2012
might be worth a read
http://www.ebay.co.uk/itm/1-8-ohm-resistor-non-airbag-steering-wheels-Momo-X4-/320706185048?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item4aab940758%20________________________________________
airbag help (FAO Cully) - ash240970 - 22-11-2012
What about going on the RX8 forum and asking on there as you may find some people have put buckets in or have access to technical data.
RE: airbag help (FAO Cully) - Niall - 22-11-2012
(22-11-2012, 06:16 PM)ash240970 Wrote: What about going on the RX8 forum and asking on there as you may find some people have put buckets in or have access to technical data.
just done it. lets see how much of a friendly bunch they are!