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post #1 of 11 (permalink) Old 08-01-2012, 06:56 PM Thread Starter
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Stock Cobalt's Instrument Cluster Not Functioning

I've scoured the forums without finding the same problem, but I'm hoping someone might be able to help me troubleshoot this one.

I'm driving a 2008 automatic cobalt lt with the 2.2 engine.
The Instrument Cluster stopped functioning; checked the fuse box on the passenger side floor board to discover fuse 7 blown. As I'm replacing the fuse, it sparks and blows the fuse.
There's a short somewhere in the line, but I can't find it. (I have not torn anything apart to follow the wire yet.)

The license plate bulb is still on, so I don't think it is related to the license plate bulb or socket (but i could be wrong to assume it is okay b/c it is functioning).

Any thoughts or advice on where to look next?

Last edited by tkoller; 08-01-2012 at 07:10 PM.
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post #2 of 11 (permalink) Old 08-01-2012, 07:05 PM
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OK I'm on it and your right license plate bulb is only related to the instrument panels lighting and not the gauges themselves. I'm going to look up the diagrams and post what I can here.

It's going to be a pink wire or red white wire that come from BCM fuseblock.




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post #3 of 11 (permalink) Old 08-01-2012, 07:39 PM Thread Starter
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Awesome! I'll dig into it tomorrow when I have daylight. Thanks for posting that!
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post #4 of 11 (permalink) Old 08-01-2012, 07:50 PM
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Can't believe I found this diagram but I did. This diagram clearly shows you will be chasing a red/white wire. I suggest you remove your Cluster to eliminate it as the problem. If you still blow a fuse once the Instrument panel is out then you know your red/white wire that leaves the fuse is shorting to ground somewhere and you will have to trace it. If the fuse stops blowing once you pull the cluster you'll know it's the cluster.


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post #5 of 11 (permalink) Old 08-02-2012, 11:25 AM
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How did you make out?

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Drives 2016 Sunset Orange Trax LT1 1.4L Turbo auto 3GNCJPSB8GL142716

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post #6 of 11 (permalink) Old 08-02-2012, 06:41 PM Thread Starter
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I didn't get a shot at it yet; it is our only car (I ride a motorcycle year-round) so my wife was using the car all day. I think my first shot at it will be Friday evening after work.

That diagram you found is amazing! It fits exactly what I need! You are fantastic!
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post #7 of 11 (permalink) Old 08-02-2012, 08:04 PM
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Okay good luck! I'll be poking around if you have anymore questions.

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post #8 of 11 (permalink) Old 08-03-2012, 04:32 PM Thread Starter
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Well, got it torn apart, disconnected the cluster, tried the fuse and it still blew. There must be a short in the wire.
I wish it had been the cluster; that's easier to replace. Tracing this red/white wire feels nearly impossible.

I guess I've got to get behind the fuse box on the passenger side to rewire it, correct?
If so, is this a situation where I need to disconnect the battery so I don't give myself a good zap?
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post #9 of 11 (permalink) Old 08-03-2012, 06:14 PM
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Have you tried giving a good tug each way on the harness? Sometimes you can move the frayed wire over so it doesn't touch. Not a cure but then it gives you an idea.

And yes "C4" is on the drivers side of the BCM . The only connector on that side pin "C1"

Should be this pin... first pin, third row from the bottom row"A"....this wire is just 4 feet long. You should be able to see most of it.


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Last edited by Coby7; 08-04-2012 at 12:25 PM.
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post #10 of 11 (permalink) Old 08-24-2012, 06:22 PM Thread Starter
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Well, work got crazy, so we drove the car around with nothing in the dash for a bit. I ended up caving and taking it to my local dealer, where I had them replace the wire into the harness. They put it all back together and it is working perfectly.
They charged me for 2 hours of labor, which I was happy to pay b/c it meant I didn't have to rip the electrical apart.

Coby7 - you're the man! I would have paid an ungodly amount of money to the dealer for them to diagnose this. Thanks for saving me on this!
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