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BCM Replacing

 
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staran68
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PostPosted: Sun Jun 02, 2013 12:55 am    Post subject:  BCM Replacing Reply with quote

My BCM's finally completely dead, after being on life support for the past few months. Ive heard from some that my only option is to buy a brand new one, and have a dealer program it to my exact VIN. Ive heard from other mechanics that that's BS, and so long as i find a BCM from the same year car, with the same options, i can just swap the part and be set to go.

Anyone have any first hand experience swapping a used one into their car? Or can anyone tell me for certain that it can or cant be done? Just trying to find the absolute cheapest and easiest way to keep the car running for a short while longer..

thanks,

richard
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Frank
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PostPosted: Sun Jun 02, 2013 3:58 am    Post subject:   Reply with quote

The car will not start unless the VINs in the BCM and the PCM match.

Provided the car you are taking it from is the same year with the same options, you could change the the VIN in the PCM (which is programmable with a tuner) to match the VIN in the BCM (which is programmable only once), do a security relearn, and the BCM would theoretically work. However, the ID code from the airbag SDM (Sensing and Diagnostic Module, aka the SRS/airbag computer) is also stored in the BCM, so you may get an airbag light and your airbags may not work.

That being said, since they are known to go bad...why would you buy a used one? Smile

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staran68
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PostPosted: Sun Jun 02, 2013 10:17 am    Post subject:   Reply with quote

thanks for the info. and i was hoping to buy a used one, because not only would it have been cheaper, but i do anything i can to avoid bringing my car to a dealer.. not only is it 13 years old, but ive got a PCM tune from Intense years ago, and am always afraid a dealer is going to screw it up on me..

and also, i assume that even if i buy a brand new BCM, im mostly limited to going to a dealer to have it programmed? if so, i should be able to bring just the piece in and have it done, or is it required to be in the car to be programmed?
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9C3
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PostPosted: Sun Jun 02, 2013 10:37 am    Post subject:   Reply with quote

staran68 wrote:


if so, i should be able to bring just the piece in and have it done, or is it required to be in the car to be programmed?
It must be installed, as all programming is done through the OBD 2 connector under the dash. GARY

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PostPosted: Sun Jun 02, 2013 10:42 am    Post subject:   Reply with quote

The BCMs come unprogrammed, it has to be installed in the car to program it, and you will have to take it to someone with a Tech 2 to program it - which typically means the dealer. If you are lucky, you might be able to find a repair shop with one.

What people on here have done in the past is drive or tow the car to the dealer, change the BCM themselves in the parking lot, and then pay the dealer just to do the programming. The car will not start with an unprogrammed BCM and additionally will not start without doing the security relearn.

You can do the security relearn without any tools on your own, but the programming/option setup of the BCM requires a Tech 2.

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staran68
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PostPosted: Sun Jun 02, 2013 10:58 am    Post subject:   Reply with quote

thanks again, everyone. not what i wanted to hear, but exactly what i needed to know, none the less. much appreciated
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98ss
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PostPosted: Sun Jun 02, 2013 12:23 pm    Post subject:   Reply with quote

I actually checked on how much the dealer would charge me for a bcm last week. I think it was just under 300 bucks, 279 otd.
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staran68
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PostPosted: Sun Jun 02, 2013 1:53 pm    Post subject:   Reply with quote

98ss wrote:
I actually checked on how much the dealer would charge me for a bcm last week. I think it was just under 300 bucks, 279 otd.


that's for just the part, i assume? they quoted me between $50 and $100 just to program it, if i put it in myself. GMpartsdirect has it for like $125 or something.
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PostPosted: Mon Jun 03, 2013 10:17 am    Post subject:   Reply with quote

staran68 wrote:
98ss wrote:
I actually checked on how much the dealer would charge me for a bcm last week. I think it was just under 300 bucks, 279 otd.


that's for just the part, i assume? they quoted me between $50 and $100 just to program it, if i put it in myself. GMpartsdirect has it for like $125 or something.

I can beat gmpartsdirect's price. Just let me know. Very Happy

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staran68
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PostPosted: Mon Jun 03, 2013 3:03 pm    Post subject:   Reply with quote

PM sent, at your convenience. thanks alot
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PostPosted: Mon Jun 03, 2013 3:31 pm    Post subject:   Reply with quote

It's funny. I see people on auction sites selling used working BCM's for $50-$70. What they're not saying is they can't be reprogrammed to another car like ECM's can. Rip off. GARY

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Pitch Black SS
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PostPosted: Mon Jun 03, 2013 4:29 pm    Post subject:   Reply with quote

9C3 wrote:
It's funny. I see people on auction sites selling used working BCM's for $50-$70. What they're not saying is they can't be reprogrammed to another car like ECM's can. Rip off. GARY


most people outside of the W-Body community dont know they cant be reflashed. If they are just stripping cars for parts, they simply sell what they have without any knowledge of what can or cannot be used.

If you simply buy a used BCM / ECU / PCM without doing any research, you deserve to get burned whether it was done intentionally or not.

It doesnt take a whole lot of effort to use google.

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9C3
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PostPosted: Mon Jun 03, 2013 4:49 pm    Post subject:   Reply with quote

Pitch Black SS wrote:


most people outside of the W-Body community dont know they cant be reflashed. If they are just stripping cars for parts, they simply sell what they have without any knowledge of what can or cannot be used.
But most I see are being sold by junk yards who should know this, since it's their business, not a hobby. GARY

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PostPosted: Tue Jun 04, 2013 1:07 pm    Post subject:   Reply with quote

9C3 wrote:
Pitch Black SS wrote:


most people outside of the W-Body community dont know they cant be reflashed. If they are just stripping cars for parts, they simply sell what they have without any knowledge of what can or cannot be used.
But most I see are being sold by junk yards who should know this, since it's their business, not a hobby. GARY


their business is to sell parts, not to know every little detail about every part. Most computers are reflashable, Id say 95% if not more. So why wouldnt they expect the BCM to be.

You ask for a part, they sell you the part, thats all they do. Its up to you to know if that part will work for what you are doing.

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PostPosted: Tue Jun 04, 2013 1:13 pm    Post subject:   Reply with quote

Pitch Black SS wrote:
9C3 wrote:
Pitch Black SS wrote:


most people outside of the W-Body community dont know they cant be reflashed. If they are just stripping cars for parts, they simply sell what they have without any knowledge of what can or cannot be used.
But most I see are being sold by junk yards who should know this, since it's their business, not a hobby. GARY


their business is to sell parts, not to know every little detail about every part. Most computers are reflashable, Id say 95% if not more. So why wouldnt they expect the BCM to be.

You ask for a part, they sell you the part, thats all they do. Its up to you to know if that part will work for what you are doing.


Agreed. These days, there is way too little emphasis on "buyer beware".
It is reasonable in some cases to expect a seller to know what they're selling. But used items in general, I'd suggest doing the research.

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