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Discussion Starter #1
I recently replaced a turn signal module on my 2007 Cobalt LS. The swap worked fine - but, now I have an indication that my air bag needs servicing. Is there any wiring in the steering column I could have disturbed, that is implicated? I took it to Auto Zone to run a code, but it came up empty - no code found. I tried disconnecting the negative terminal of the battery for a few minutes, to no avail. Not sure what else I might be able to do, to further diagnose.

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Dan
 

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What do you mean by turn signal module?

---------- Post added at 07:05 PM ---------- Previous post was at 07:04 PM ----------

Turn signal lever maybe?
 

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Yeah that's the lever, but I don't think you can disrupt the airbag wires by changing the lever. Airbag is separate harness that runs to the clock spring. Could be one of a few things. Regular OBDII readers won't read ABS and SRS codes, you need a TechII or similar reader. Lots of times it's the passenger presences seat switch where people clean under the seat and inadvertently disconnect it.

---------- Post added at 09:23 PM ---------- Previous post was at 09:22 PM ----------

Check that first.
 

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Discussion Starter #5
Ah! So, the complaint could actually be coming from the passenger side... OK, will check the connectors. Any harm in disconnecting/reconnecting for good measure?

Thanks for the tip
Dan
 

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Nope should actually do it a good cleaning.

---------- Post added at 10:14 PM ---------- Previous post was at 10:13 PM ----------

That is the most common issue but it could be any one of the sensors.
 
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Discussion Starter #7
OK, finally getting around to checking the under-the-seat connectors. I disconnected, and snugged up real well; still, the indicator is on.

It seems to me a remarkable coincidence that I (successfully) replaced the turn signal lever - by taking apart the steering column housing as described here - and this indicator came on. At any rate, what's the next step in my diagnosis?

Thanks
Dan
 

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Did you check the airbag fuse? fuse 13 in BCM fuse block.
 

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Front impact sensor under the hood??? Not a lot to it in the 2007.....
 

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Discussion Starter #12
Where is it, and what is the procedure for checking it - something I can do with a VOM?

Is there a diagram of the circuitry? If it's seat related, I'm wondering if there is something I can jumper, in an attempt to further diagnose.

...and if there are wires going to the airbag in the steering column - and, I was in the steering column fixing the turn signal lever when this all started - I am still hard pressed to believe any other failure happened coincidentally. But hey, what do I know about Chevy Cobalts? Nothing.
 

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Did you remove the air bag? Or you just worked around it.

The front impact sensor is mounted in the middle of the rad support. Facing the engine.
 

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Discussion Starter #14
I just worked around the airbag.

How do I check the sensor? Is it a N/C or N/O open switch, do I check it by removing the connectors and checking for continuity?
 

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Kinda need a TechII to check it. But you could always check it for corroded contacts.
 

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Discussion Starter #16
This guy, right? Sorry for being fuzzy, I couldn't get a shot of it further away.

It looks like it's got a tamper tie-wrap on it, so I'm not sure I can check the contacts for corrosion without cutting it - and if that's advisable.

I'm back to the seat(s): Are these N/O contacts, that are supposed to close when you sit in them - and, possibly, they aren't? If so, could I rule them out by jumpering the contacts (just for diagnosis)?

Apart from (re)taking the column shroud apart and inspecting, I'm not sure what my next step is - except, perhaps, to take it to a specialist. And that, as we know, will involve some serious $$. I was hoping to avoid.

Dan
 

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Find somebody with a TechII or full optioned Snap-On reader and get the code read. A lot of cheap readers won't read SRS or ABS codes.
 
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