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No Abs, No Doors, No Windows, No Airbags, No Radio, No Power To Obd2...
soldier74
post Apr 30 2017, 06:11 AM
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Hey Team, long time since I've been in here!


So last week I came out to a dead battery. I jumped started it and found that my four gauges on the right had no power, my ABS light was on, battery light was on, and my airbag light was on. Additionally there is no power to the radio, no power to the doors or windows, no power to the 4WD select module, and there is no power to the OBD2 port (the OBD2 scanner powers on once connected but it cannot communicate with the computer).

I charged the battery and I can still start the truck just fine. Though, it doesn't seem to "fire" off at that first turn, just kind of starts quietly and stays idling (idling well).

I bought a new alternator because it didn't seem to be putting out enough volts during the load test. Low 13's when revved and lights on and it wouldn't budge when I turned everything on.

I put in the new alternator and still nothing.

I haven't checked the ground straps yet but after writing this, I am going to. I can see two visible ground straps, one from the engine block to the firewall and one from hood to the firewall. Are there are any other ones I cannot see that I should check?

And yes, fuses are all good to go.


Anyone have any ideas or experienced this problem?

Thanks in advance for the help.

JC





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duntov
post Apr 30 2017, 08:35 AM
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I would start by checking the BCM (Body Control Module)'.


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soldier74
post Apr 30 2017, 01:02 PM
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QUOTE (duntov @ Apr 30 2017, 09:35 AM) *
I would start by checking the BCM (Body Control Module)'.


Is there a way to check that without buying a new one?


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duntov
post Apr 30 2017, 08:08 PM
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QUOTE (soldier74 @ Apr 30 2017, 03:02 PM) *
QUOTE (duntov @ Apr 30 2017, 09:35 AM) *
I would start by checking the BCM (Body Control Module)'.


Is there a way to check that without buying a new one?


Not really. All you can do is check the connector for corrosion by unplugging it and plugging it back in. You might get lucky. If not, I would see what codes you might have. I understand you pain. My next vehicle will have no computers at all and only a oil pressure and water temp sensor. Life will be simpler.

This post has been edited by duntov: Apr 30 2017, 08:09 PM


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Gary P
post May 1 2017, 04:37 AM
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QUOTE (duntov @ Apr 30 2017, 10:08 PM) *
QUOTE (soldier74 @ Apr 30 2017, 03:02 PM) *
QUOTE (duntov @ Apr 30 2017, 09:35 AM) *
I would start by checking the BCM (Body Control Module)'.


Is there a way to check that without buying a new one?


Not really. All you can do is check the connector for corrosion by unplugging it and plugging it back in. You might get lucky. If not, I would see what codes you might have. I understand you pain. My next vehicle will have no computers at all and only a oil pressure and water temp sensor. Life will be simpler.


John - I've often thought about that! thumbsup.png Is your next one a road worthy vehicle, or off-road?


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2012 Summit White Silverado 2500HD 4WD Z71 Crew Cab, New 8/31/12 ... with a Black Bear Performance tune - Love it!
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2002 Silverado 1500 LS, Ext cab, 4WD...Gone, but not forgotten.... SOLD 8/31/12

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soldier74
post May 1 2017, 09:48 AM
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QUOTE (duntov @ Apr 30 2017, 09:08 PM) *
QUOTE (soldier74 @ Apr 30 2017, 03:02 PM) *
QUOTE (duntov @ Apr 30 2017, 09:35 AM) *
I would start by checking the BCM (Body Control Module)'.


Is there a way to check that without buying a new one?


Not really. All you can do is check the connector for corrosion by unplugging it and plugging it back in. You might get lucky. If not, I would see what codes you might have. I understand you pain. My next vehicle will have no computers at all and only a oil pressure and water temp sensor. Life will be simpler.


Yeah that's what I figured. Sucks being stationed overseas. Time to start pulling things out.


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duntov
post May 1 2017, 02:56 PM
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QUOTE (Gary P @ May 1 2017, 06:37 AM) *
QUOTE (duntov @ Apr 30 2017, 10:08 PM) *

My next vehicle will have no computers at all and only a oil pressure and water temp sensor. Life will be simpler.


John - I've often thought about that! thumbsup.png Is your next one a road worthy vehicle, or off-road?



Nostalgia road vehicle for sure. Working on the engine now. A mild gen. 1 sbc 383 stroker. Block is being machined now. Three IDA Webers and a Pete Jackson front distributor drive.





This post has been edited by duntov: May 1 2017, 02:57 PM


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2003 Suburban 2500 Quadrasteer, 416 ci, Whipple 2.9L, ARH, 4.10 ratio, progressive body lift.



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Gary P
post May 2 2017, 06:01 AM
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John - wub.gif That's going to be sweet!

Soldier74 - Any luck with your problem? I hate electrical gremlins. It's something I just never got the hang of..... wacko.gif


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2012 Summit White Silverado 2500HD 4WD Z71 Crew Cab, New 8/31/12 ... with a Black Bear Performance tune - Love it!
2005 Summit White Tahoe 4WD Z71 (For the wife.... finally!)

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Podor
post May 2 2017, 11:28 AM
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It sounds like you have a power feed out that is common to all those systems. There are big "fusible links" in the fuse box under the hood . You have to visually inspect them instead of using a test light. I don't have schematics, but whatever supplies power to the OBD connector would be where I would start.
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soldier74
post May 22 2017, 02:33 PM
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Sent my BCM to the states to get copied over to a new one. Plugged the new one in today and still nothing. Checked the PCM connectors and they look good. Now I am wondering what else could it be. I was thinking maybe the ignition switch but the PCM is getting power because the CEL is on. Still have power through OBD2 port but it cannot contact the PCM.


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soldier74
post May 25 2017, 04:13 AM
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Did some further troubleshooting thanks to the help of the guys from GMFLASH.

Took the BCM out, started up with the PCM connected and it started right up.

Turns out it most likely is a bad PCM. I'll update as I go along with this nightmare.




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Scott
post May 25 2017, 08:03 AM
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Wow, nightmare for sure! Glad to hear you are starting to get it figured out.


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soldier74
post Jun 8 2017, 04:25 PM
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Got back home late from Germany tonight. Got the new PCM installed and attempted to do the relearn but I think the 30 minute process killed my battery. It's on a charger now and will try again in the morning. I did notice that on the last part of the relearn, all of the lights went away except the CEL.

I'll try again in the morning and update. I am praying that this is the fix. The only thing left to replace that would be a possible issue is the instrument cluster.

With that said, can an instrument cluster, if malfunctioning, cause issues with the door unlock, windows, and radio unit? I'm beginning to think that maybe the cluster may be fried if this PCM doesn't fix it.



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soldier74
post Jun 10 2017, 09:47 AM
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After just over $400 in replacing a PCM, BCM, ignition switch, alternator and grounding straps.

Spending several hours checking fuses, resistance, voltage, ground, and batteries.

I had just about enough of it all and decided to start tearing out dash components praying to find a fried wire.

I stumbled upon my old iSimple radio module that I installed two years ago. Decided that I should just unplug it all since I never use it.

Several hours later after never finding a single fried wire, I bolted everything together all nice and perfect.

Decided I should just put my old PCM in just so I can still get back and forth to work. I would only have to open the roof window for air flow and I would have to open to door to hand security my ID's before going on post....no big deal for a temporary fix.

I charged the battery for a few hours, checked voltage. Got in my truck, fired it up as normal. All of a sudden I have power to everything again. No more ABS light, No airbag light, power to the radio and OBD2, and my windows and doors were fully functional.

I've been monitoring voltage for any sudden drains and the battery is holding just fine.

I've come to conclusion that my iSimple completely crapped out and was somehow causing the nightmare electrical issues. I don't how and I don't know why. But all I know is that I have my truck back and that iSimple is sitting far far away from my truck.

I don't like bashing products because I am not a tech nor do I pretend to be, but in my case, and in the case of process of elimination, the iSimple is capable of causing electrical issues. This is my warning to all of you.


.......and now I've got code P0107 coming up.....and after all of this....I am fine with that small fix right now.

Cheers everyone and enjoy your weekend!!!


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duntov
post Jun 10 2017, 10:56 PM
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Great news! Sorry to hear you spent all that money and it ended up something simple.


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John
2003 Suburban 2500 Quadrasteer, 416 ci, Whipple 2.9L, ARH, 4.10 ratio, progressive body lift.



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Scott
post Jun 12 2017, 08:37 AM
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Wow???


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02burgundybeast
post Jun 20 2017, 06:07 PM
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electrical gremlins are the worst. glad you got it squared away


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