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Citroen C5 2004 - Airbag fault #

Posted by Jamie Lambert on February 12, 2012, 10:10 pm

Year of Manufacture *: 2004

Hi all
How would i find what the air bag resistance is on this vehicle. Looked on the back of the air bag but it doesnt say.

Regards Jamie

Re: citroen c5 -- airbag fault

Posted by Craig Hewison <iframe src='https://members4.boardhost.com/ukautotalk/info/user=ukat3409' width='330' height='300' border=0 style='border:none;'> on February 12, 2012, 11:26 pm, in reply to "citroen c5 -- airbag fault"

Hi Jamie

I would be very reluctant to test airbag resistance, the way multimeters test resistance is by putting a small voltage through the component, this voltage can be more than enough to deploy an airbag!

The difference between a cheap multimeter and an expensive one is the amount of voltage they input, good ones will put a very small voltage thrhrough! I believe some dealers have a special tool for testing airbag resistance where the voltage is EXTREMELY small but they cost a fortune!

Hth
Craig

Re: citroen c5 -- airbag fault

Posted by Mark Carter <iframe src='https://members4.boardhost.com/ukautotalk/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on February 12, 2012, 11:53 pm, in reply to "Re: citroen c5 -- airbag fault"
Mark Carter

Hi Jamie,
>>> How would i find what the air bag resistance is on this vehicle. Looked on the back of the air bag but it doesnt say <<<

Can I ask why you want to know?

Mark

Modern cars, Its all wizardry and witchcraft

Re: citroen c5 -- airbag fault

Posted by Jamie Lambert <iframe src='https://members4.boardhost.com/ukautotalk/info/user=UKAT1460' width='330' height='300' border=0 style='border:none;'> on February 13, 2012, 11:47 am, in reply to "Re: citroen c5 -- airbag fault"
Jamie Lambert

Hi Mark and Craig

I wasnt going to test the airbag with a multimeter, i have read a post about airbag testing and some members were using resitors to subsitute the airbag. Sorry should of put that in my original post.

Regards Jamie

Re: citroen c5 -- airbag fault

Posted by Mark Carter <iframe src='https://members4.boardhost.com/ukautotalk/info/user=UKAT1428' width='330' height='300' border=0 style='border:none;'> on February 13, 2012, 2:29 pm, in reply to "Re: citroen c5 -- airbag fault"
Mark Carter

Look on the bay of flees and search for a Decade Box, it will do everything you need.

Mark

Modern cars, Its all wizardry and witchcraft

Re: citroen c5 -- airbag fault

Posted by Jamie Lambert <iframe src='https://members4.boardhost.com/ukautotalk/info/user=UKAT1460' width='330' height='300' border=0 style='border:none;'> on February 13, 2012, 6:36 pm, in reply to "Re: citroen c5 -- airbag fault"
Jamie Lambert

Hi Mark

Thanks for the advice, been looking but there is quite a few ranging in different prices. Dont know which one i need, also how do you find the resistance of the air bag.

Regards Jamie

Re: citroen c5 -- airbag fault

Posted by John Nolan on February 13, 2012, 6:59 pm, in reply to "Re: citroen c5 -- airbag fault"
Message modified by board administrator February 14, 2012, 3:42 pm

its usually 2.7 ohm's. but ive found it ranges anywhere from 1-4 ohms. i keep a range of them it stock.

but basically how you find out is buy fitting it to the circuit and erasing the airbag fault memory. if the light stays out youve got an accetable resistance.

it may be programmed into the airbag ecu the any resistance lower than 0.30 ohms will set a code, resistance to low or any thing higher that 4.0 ohms will set a code, resistance to high so as you can see any resistor between 0.30-4.0 ohms will do the job. 2.7ohms usually does the trick.

Re: citroen c5 -- airbag fault

Posted by Jamie Lambert <iframe src='https://members4.boardhost.com/ukautotalk/info/user=UKAT1460' width='330' height='300' border=0 style='border:none;'> on February 15, 2012, 8:18 pm, in reply to "Re: citroen c5 -- airbag fault"
Jamie Lambert

Hi John

Thanks for the reply, got some resistors from maplins that will do me for now. Think im going to get a decade box as Mark has sugested.

Regards Jamie

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