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Old 03-15-2007, 12:39 PM   #1 (permalink)
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Default Air bag light problem

Hi ive recently bought an 03 a4 when i bought it the air bag light remained constantly on because the old seats were taking out and replaced wit new leather ones the new ones didnt hav air bags in them so my problem is the light remains on because i cannot reconnect the sensor ive being down to my local mechanic
and he says its impossible to take the light off or remove the blub or fuse that lights it up because it would immoblise car ???? its nothing major but having just spent 22k euro on a car its somthing i could do without any1 with any ideas about this Thanx in advance
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Old 03-18-2007, 04:51 AM   #2 (permalink)
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Firstly, you need to hook it up to a fault code reader, and clear all stored fault codes. The airbag/SRS warning light will never "self clear", so unless you do clear the codes, the light will remain.

If that doesn't clear the fault, then you will need to find someone with VAG-COM, and re-code the relevent ECU so that it does not look for the seat side airbags.

Failing that, refit the old seats.

When the airbag light is illuminated, NONE of the airbags, nor belt pretensioners, nor load limiters will work. I don't know what the law is like in Ireland, but in the UK, the airbag light is MoT testable. In Ireland, the Garda may prosecute you if stopped, and if you have a prang with defective airbags, your insurance will probably be void too!

Rgds
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Old 03-19-2007, 08:51 AM   #3 (permalink)
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Air bag light can't be recoded what you have to do is trick the computer in to thinking it’s connected. To do that you need a 4ohm resister bridged across the plug then have someone with VAGCOM clear all codes.

I have done this to my 2000 A4 and see no reason why you can't do it.
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Old 03-19-2007, 09:10 AM   #4 (permalink)
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ok thanx i will tell my mechanic to do so he working on the car 2moro
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Old 03-19-2007, 09:35 AM   #5 (permalink)
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04 Audi A4 B6 1.8TQ S-Line 190bhp 6 Speed Duel SMIC
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Old 05-30-2007, 12:17 PM   #6 (permalink)
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Don’t forget, it may be an MOT failure if the air bag lights on.

The air bag circuit must be complete to make the light go off.
Not much help though,
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Old 06-01-2007, 01:04 AM   #7 (permalink)
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Just a thought, hope the resistor works, but just another option – maybe,
The air bag control unit is coded. These codes tell the system how many air bags the car has, usully by the year of the car.

Coding table for the airbag control unit

System version Coding
Driver's airbag active
both belt tensioners active Code - 00766
Driver and front passenger's airbag active
both belt tensioners active Code - 01022

These codes exclude the seat air bags.

Just another thought!
Best of luck
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Old 02-28-2011, 01:24 PM   #8 (permalink)
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Putting this in for the archive. I have a 2001 Audi TT Roadster, 101,000 miles. Airbag light came on shortly after purchased (bought used in 2010 with 94,000) intermittently. Would sometimes come on at start, then cut off after car had run for a few minutes, mostly on longer road trips 20 or more miles.

Then about 2 months into ownership the alternator/battery light came on, replaced alternator with new. Mechanic (who I trust) said the voltage regulator was fried and had been for some time, probably from the car lot jumping it off after a dead battery.

Like magic after about 15 starts with the new alternator, airbag light went off and stayed off for about 8 months. No problems at all. Just a regular startup where the light comes on for about 3 seconds at start to do a self check, then turns off.

Then about 2 months ago (Dec. 2010) I noticed that on startup, my starter was a little slower, weaker than normal and the startup took just a tad longer, kinda like the battery was starting to get weak and go bad. Though nothing of it. Well, wouldn't you know it, the airbag light came back on after a week or so of that weak starting.

So, bought a scanner and tried to clear the code but it kept coming right back (code 17931). Checked cables, connections, and everything. Dealer told me my airbags had "gone bad" and i needed to replace them but i didn't believe that. I kept putting it off but finally checked the battery and, sure enough, battery was bad, only making like 12.4 volts.

So, replaced battery yesterday (Feb. 2011). And, again like magic, the airbag light has turned back off, all by itself after about 10 starts with the new battery in. No code clearing or anything it just cut off like normal.

Needless to say, this airbag light thing might be affected by the voltage in the system, not enough/too much voltage, airbag cuts off because it sees it as high resistance or not enough resistance in the airbag. Just my experience, might help somebody else, check the alternator and/or replace it and the battery.

from Birmingham, Alabama.

Last edited by matlock339; 02-28-2011 at 01:27 PM. Reason: spelling
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Old 03-07-2011, 12:11 AM   #9 (permalink)
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I would check you do not have a small drain on the battery after going through two of them.
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Old 01-20-2012, 03:05 AM   #10 (permalink)
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I'm in similar position- 03 a4 avant with aftermarket seats and permanent airbag light. The 4 ohm resistor sounds like a good way to get rid of the light. Amazed at how many different resistor types there are. Can someone advise exactly what wattage of resistor I need?
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