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Air Bag light on

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Old Dec 14, 2010 | 08:49 AM
  #1  
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Default Air Bag light on

I recently aquired a 98 convertable and now the airbag light is on.

I went through the codes and got "58-scm - no com" as the only notable thing, I am not sure what this means.

This car had a blower that was removed before I got it and the stock air cleaner assembly reinstalled. Is it possible one of the airbag connectors is near the aircleaner assy and is been bumbed loose?

It is freezing here in my garage here now so I don't rally want to crawl around under the front of the nose unless that is the most likely cause.

Anybody have a suggestion?

thanks.
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Old Dec 14, 2010 | 09:51 AM
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I would imagine the SDM is not connected down just below the havc control. Check your fuses first. Is there a more exact code for this module that's reporting?
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Old Dec 14, 2010 | 11:22 AM
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the c-5 does not use air bag sensors on the front end
so there are no lose connectors under the front
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Old Dec 14, 2010 | 04:43 PM
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on a 2000 there is a switch in the glove box to turn off the passenger air bag which will cause the air bag light to come on. not sure if 99 has it but you might want to ck..at work so can not ck the specific year info.
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Old Dec 14, 2010 | 04:57 PM
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Has HUD been added to your 98? If so, there may have been a cluster change. I thought the 97-98 referred to airbag system as "SRS" and later models refer to them as "SDM"

It could be that the airbag system is fine and that your cluster just doesn't communicate with it.
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Old Dec 14, 2010 | 06:54 PM
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Yes a HUD has been added.

There was a typo in my code display "58 SDM NO COM" was the code that shows up.

I'll check the fuses and for a switch in the glove box and see whats up.

Thanks for the suggestions

Mike
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Old Dec 14, 2010 | 07:43 PM
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Originally Posted by seoulbrooks
on a 2000 there is a switch in the glove box to turn off the passenger air bag which will cause the air bag light to come on. not sure if 99 has it but you might want to ck..at work so can not ck the specific year info.
Switch was added mid 2000. '99 won't have it unless it was installed after.
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Old Dec 14, 2010 | 09:40 PM
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There is no switch in the glovebox as noted above.

The airbag fuse seems OK and there is an extra connector just over the airbag fuse with 2 fuses in it that is not in the Manual or fuse box lid fuse diagrams. I suppose that is for the added HUD, which is also not mentioned in the 98 manual so it must have been added later.

Mike
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Old Dec 14, 2010 | 10:05 PM
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Originally Posted by ipsik
I suppose that is for the added HUD, which is also not mentioned in the 98 manual so it must have been added later.
Indeed. First year for HUD was 99.
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Old Dec 16, 2010 | 11:56 AM
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Originally Posted by jirasvet
the c-5 does not use air bag sensors on the front end
so there are no lose connectors under the front
Yes it does. There is an impact sensor that mounts on the front frame rail.
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Old Dec 16, 2010 | 05:00 PM
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Originally Posted by JonLT4CE
Yes it does. There is an impact sensor that mounts on the front frame rail.
Nope not on a c-5, ask me how I know

and show me where on this pic the sensor would be on the front frame

Last edited by jirasvet; Dec 16, 2010 at 05:04 PM.
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Old Dec 16, 2010 | 05:29 PM
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Originally Posted by jirasvet
.........ask me how I know
Yer new dental work?

Originally Posted by jirasvet
Nope not on a c-5,.......
'97-'98 Gm part #16203545 mounted on front bumper reinforcement

'99 + part of SDM module mounted on tunnel under radio.
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Old Dec 16, 2010 | 06:14 PM
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Originally Posted by LoneStarFRC
Yer new dental work?



'97-'98 Gm part #16203545 mounted on front bumper reinforcement

'99 + part of SDM module mounted on tunnel under radio.
Well i guess that clears that up, got to love year breaks and engineering changes
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Old Dec 16, 2010 | 06:48 PM
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Originally Posted by jirasvet
Well i guess that clears that up, got to love year breaks and engineering changes
They ALL do it (running production changes) to one degree or another, but Ford is notorious for it. More so than GM, in my experience.

Moral to story: be careful about saying things like "none" or "no", "never", etc.

Btw, the C6s have 2 sensors up front and one in each door.
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Old Dec 16, 2010 | 06:55 PM
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Originally Posted by LoneStarFRC

Moral to story: be careful about saying things like "none" or "no", "never", etc.
so true and I always slip on that


Btw, the C6s have 2 sensors up front and one in each door.
I new about the C6s. I find it funny how they did away with them from your info and how they went back to them
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Old Dec 16, 2010 | 07:05 PM
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Originally Posted by jirasvet
.......I new about the C6s. I find it funny how they did away with them from your info and how they went back to them
Yep. The C6 system is reeeeally complex compared to the C5. Two stage air bags, seat position sensors on seat tracks (to determine stage 1 or stage 2 air bag deployment), seatbelt pretensioners (with their own separate pyrotechnics), passenger presence seat sensor. Crazy.
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Old Dec 17, 2010 | 02:44 PM
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Has HUD been added to your 98? If so, there may have been a cluster change. I thought the 97-98 referred to airbag system as "SRS" and later models refer to them as "SDM"

It could be that the airbag system is fine and that your cluster just doesn't communicate with it.
So it is possible the airbag light is on but nothing wrong? Just doesn't seem right to me.

Also it appears there is a a sensor in the front bumper area that may be unplugged by accident as the air cleaner assembly was worked on.

I'll have a closer look.
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Old Dec 17, 2010 | 02:50 PM
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Originally Posted by ipsik
So it is possible the airbag light is on but nothing wrong? No. Just doesn't seem right to me. Because it isn't.

Also it appears there is a a sensor in the front bumper area that may be unplugged by accident as the air cleaner assembly was worked on.

I'll have a closer look. Good idea.
This.
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Old Jul 29, 2024 | 02:30 AM
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Originally Posted by ipsik
So it is possible the airbag light is on but nothing wrong? Just doesn't seem right to me.

Also it appears there is a a sensor in the front bumper area that may be unplugged by accident as the air cleaner assembly was worked on.

I'll have a closer look.
hi, i know this is a very old thread but did you end up finding a solution? im having the identical issue with my 98 C5 that has a 2002 IPC(gauges and computer) and i now get SDM NO COMM. same as you. please let me know what you did cheers!
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