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Cobalt SS 2.4 won't start, wire issue/BCM

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Old 10-04-2018, 12:03 PM
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Cobalt SS 2.4 won't start, wire issue/BCM

Hello all,

I had an issue with my safety button on my automatic shifter and had to remove it to fix it. When I was putting the last nut on to secure the shifter, I noticed a burning smell; I looked down and saw smoke. The dome light turned off, windows stopped working, brake lights stopped working etc. Headlights still worked, as well as the third brake light and dash lights. I had pinched a red wire with a black stripe on it in a thick bundle of wires running on the passenger side of the shifter, which I traced back to the BCM. I also can't get a connection to the OBD2 port when I hook a scanner to it.

So, I'm stuck at this point and am not sure what to do next; the car won't even turn over, the anti theft light is on, power steering notification is on, traction control light is on and a few others. I checked all fuses and they are fine. The only thing I can think of is to remove the center console, fix the wire and pray to God it isn't a fried body control module (BCM). Anyone have any thoughts on this issue?

Thank you in advance,

Jesse

Last edited by Roadhog117; 10-04-2018 at 12:26 PM. Reason: Added details.
Old 10-04-2018, 12:06 PM
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Did you check fuses in the cab and under the hood?
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Old 10-04-2018, 12:08 PM
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I did.
Old 10-04-2018, 12:10 PM
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**** man idk. There are a few people on here that have access to wiring diagrams that may be able to lend some troubleshooting assistance.
Old 10-04-2018, 12:14 PM
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That would be helpful haha. I tried to figure out what the red and black wire is for, but all of the diagrams I saw online going to the BCM had no red and black wire listed. I just fixed a ton of stuff on this car and was one flipping nut away from being done and now the thing won't start because of one pinched little wire.

Hey, while we are talking about fuses though, is there any specific fuses I should check? I went through them once, but it wouldn't hurt anything to look again as long as I know any particular issue fuses to look out for.

Last edited by Roadhog117; 10-04-2018 at 12:19 PM. Reason: Adding to discussion to ask question.
Old 10-04-2018, 01:47 PM
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Originally Posted by HGT
Start with the 30A BCM3 fuse under the hood.



Thank you for the diagram that is awesome! My car is at my dads shop a few hours from me, but I'll send him this so he can check it and I'll give an update as soon as I hear back from him. Any other fuses to check if that isn't blown? I'm hoping that by fixing the wire it will go back to normal, but I'm thinking it had to have blown a fuse somewhere because of the smoke coming from where the nut was touching the wire and the dome light turning off right after.
Old 10-04-2018, 08:45 PM
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BCM 3 fuse is good.
Old 10-04-2018, 09:39 PM
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Originally Posted by HGT
Was that the wire that was smashed? Red with Black
Was it cut in 2?
Is there power on that wire where it was smashed?
Not cut in 2 exactly but definitely got cut pretty bad; theres no power going to the wire as of now, and yes it was the red and black wire.
Old 10-04-2018, 09:54 PM
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Originally Posted by HGT
Can you check to see if there is power at the fuse on both sides?
What year is your SS?
There is no power at the BCM. It's a 2006.

With the fuse out there is power on the front blade, with the fuse in, there is power on both.

Last edited by Roadhog117; 10-04-2018 at 10:01 PM.
Old 10-04-2018, 10:27 PM
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Originally Posted by HGT
The last but not as likely is the 50amp in-line fuse coming off the battery positive.
Where is the 50a fuse located?
Old 10-04-2018, 10:36 PM
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GOT IT! 50a fuse in the trunk was blown. Thank you so much HGT, you have been a huge help!
Old 10-05-2018, 07:47 AM
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The headlights, third brake light and dash lights still have power when the 50amp fuse in the trunk is blown?
Old 10-05-2018, 12:07 PM
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Originally Posted by jdbaugh1
The headlights, third brake light and dash lights still have power when the 50amp fuse in the trunk is blown?
That fuse goes to the BCM only, according to this diagram:


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Old 10-05-2018, 08:43 PM
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Thank you guys for all of the helpful posts! As of tonight, the new 50 amp fuse went in and it started up with no issues I had just finished replacing the crankshaft seal, serpentine belt, front outer tie rod ends, headers/exhaust manifold that was cracked (replaced with a stainless steel one instead of cast iron,) fixed key stuck in ignition issue (small metal clip inside shifter,) replaced broken turn signal stalk, installing new Akkon brand black projector headlights, k2 motor tail lights and painting the wheels etc. before I blew that fuse. So, needless to say, I am very happy to finally get this thing back on the road.

Thanks again,

Cheers!
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