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General E46 Forum
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Old 08-08-2013, 12:11 PM   #1
Augster
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Exclamation Determining if steering wheel airbag deployed

Checked my SRS codes via BMW Scanner and I find the following trouble codes present:

0B [001] Driver's air bag stage 1, resistance too low
0D [013] Driver's air bag stage 2, resistance too low

I pulled the steering wheel airbag off and it doesn't appear to be tripped, but I'm no expert on airbags. The torx screws that held the base model airbag in place still had the foil anti-tamper covers untouched so it would appear that the previous owner did not touch the airbag assembly (of course, by my removing the airbag, I've destroyed the anti-tamper foil covers).

What terminals can I test for proper resistance, and what should be the reading?

I don't want to pop for a new airbag if it ends up being some wiring issue elsewhere.
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Old 08-08-2013, 12:30 PM   #2
Zell
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I wouldn't measure the resistance the actual airbag itself. You'd be sending a small voltage through it

Let's try some other stuff. Can you honk your horn, use the steering wheel controls and all that? That way we can rule out the clock spring. The next thing I would look at would be the wires that run from the clock spring connector in the back of the steering wheel to the airbag itself, and even check the pins on the connector. It's been a while since I've taken apart my steering wheel, but the wiring is replaceable.
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Old 08-08-2013, 12:40 PM   #3
Augster
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Everything works on the steering wheel: horn and multi-function buttons. The front face/cover doesn't appear to have been opened, nor is it loose: no way can I pry it open.

The wires and pins on the clock spring look good; not bent. The back side of the air bag assembly looks like it has never been disturbed in any way, though, I'm not sure if a bag deployment would do anything to disturb the wiring mounts and placement. The center connector on the back of airbag assembly still has what looks like some sort of putty or sealant.
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Old 08-08-2013, 12:49 PM   #4
Augster
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There's a "cheap" multi-function dual-stage airbag for $80 on eBay. I may get it to see if the codes clear up...
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Old 08-08-2013, 01:05 PM   #5
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For $80, worth a try. Just send it back if it doesn't help.
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