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DTC B1000 - FSM and tech 2 are not helping this time... FSM says to replace BCM. As most know, discontinued and a used unit is one time use. Once tied to your vin it's done. I've read the current threads & spent a few hours searching the web for a repair...
Dino's salvage says they can "clone" your unit unit another "used" one that you provide for $495, plus you have to supply the second "used" unit for $$??
Napa is actually showing a Cardone reman unit for $543.99 plus core.
Several other PCM/BCM repair sites I contacted said NO.
Module Experts.com out of Florida said they would repair this unit for about $255 with shipping. But reviews of their site are pretty bad...
Anyone else have any thoughts on getting this repaired?? Also, if anyone has a used unit laying around (working or not) I'd like to get it in order to inspect the circuit boards & see what my board repair experience can uncover... Wondering why GM chose to use a one time prom for vin? I suppose the prom could be desoldered/swapped but that's a chore
For reference GM part # for this year is: 15288103
If you have soldering and trace skills, easy enough to pull the board out of the case, and just find the problem yourself.
Also, before you go this far, would disconnect the battery,and just pull the BCM connectors to clean them and the socket pins with spray electrical cleaner, since problem may just be a corrosion problem there instead.
As for replacing the BCM with another unit, will need to be SPS flash in the New BCM to the car, so dealer charge of around $150 to do this, or could be $40 if you know someone that does have a tech2 and you pick up a TDS account for just the car on your own dime so they can use it to SPS flash the module in.
As for GMSI, it will always tell you to replace a trouble items, since dealers are just parts changers, not bench techs that can resolve a troubles module problem instead. Hence most of the time, just a cold solder joint on the board, since the header pins have a lot of metal in them, don't get hot enough during the solder bath, leaving a quiestion solder joint that may pass intinal QC, but enough vibration to the joint, causes a problem down the line instead.
Good info... I actually did pull the BCM & used deoxit 5 on all the pins... tried to open the case but even with the snap closures started I couldn't get the center section to part?? Not sure if its the screw boss for the connectors to bolt down or something else holding it together??
I also already own a tech2 & tis2000 software. I actually installed and configured this very BCM for the guy 2 years ago?!? Obviously something is amiss in the wiring harness that I need to track down. Why else would a second BCM fail so soon??
As for board from top cover, heat gun to break down the silicone they used to glue it into the top cover.
As for tis2000, does not have the needed TSB file for the steering lock TSB, so have to use TDS on line to get that firmware file for a M6 2005 cars.
As for if trace in blown on the board that has to be built (not just a cold solder joint problem), then need to start checking wiring harness for problems/shorts, or could be a simple as too much amperage draw on fuse/trace instead.
Trog, I'm in the same boat with 2005 BCM nightmares. Have spent months researching and troubleshooting and thousands of dollars with shops
Had a good conversation with someone from (https://www.autoecmstore.com/) that shed some very interesting light on the subject. They had both the 2005 BCM and the '06-'08 BCM listed as available. I tried buying them both but they canceled the orders and said,
"There is currently a build defect on this item which doesn’t allow us to stock it at this time. Sorry for the inconvenience."
I asked what defect and they replied, "There is currently a build defect on this item which doesn’t allow us to stock it at this time. Sorry for the inconvenience." I said "Oh man, the EEPROM? that's good to know. Is GM addressing it or is there any 3rd party support for this issue?"
They replied, "EPROM / processor. GM is not doing anything about this. It seems to be all up to the aftermarket at this point.
Very poor service from GM in my opinion"
Makes me wonder if enough people could drum up issues with GM, maybe they'd fix the issue. Maybe need some legal advice. I had my vette at a legit electrical diagnostic auto shop and they told me that its just plain broken. Seems like BS that you can't fix a car that's not even 20 years old.
) video on GM BCM EEPROM rewriting. I've followed along to a T, however still doesn't fix the issue. It'll program correctly via SPS and Tech ii. But after shutting off the car, it "loses" its programming and doesn't keep communicating with any other modules. I've reached out to Dr. Shock on YT to see if he'd consult and help me troubleshoot but no response yet.
Between what AutoECM told me and what I'm seeing the module do. Makes me think that the BCM has another chip on the board that stores VIN info for a double check. I kinda want to try wiping the whole board with a magnet and see what happens. I mean at this point what do I have to lose?
I'm looking into aftermarket BCMs or standalone ECUs that can also control the body functions, but that seems like a stretch...
I might make this a new post just to generate more search results. Again, I'm thinking if enough Corvette guys can band together we can solve it or get the right people involved.
Originally Posted by Trog
DTC B1000 - FSM and tech 2 are not helping this time... FSM says to replace BCM. As most know, discontinued and a used unit is one-time use. Once tied to your vin it's done. I've read the current threads & spent a few hours searching the web for a repair...
Dino's Salvage says they can "clone" your unit unit another "used" one that you provide for $495, plus you have to supply the second "used" unit for $$??
Napa is actually showing a Cardone reman unit for $543.99 plus core.
Several other PCM/BCM repair sites I contacted said NO.
Module Experts.com out of Florida said they would repair this unit for about $255 with shipping. But reviews of their site are pretty bad...
Anyone else have any thoughts on getting this repaired?? Also, if anyone has a used unit laying around (working or not) I'd like to get it in order to inspect the circuit boards & see what my board repair experience can uncover... Wondering why GM chose to use a one time prom for vin? I suppose the prom could be desoldered/swapped but that's a chore
For reference GM part # for this year is: 15288103
GM BCM EEPROM rewriting. I've followed along to a T, however still doesn't fix the issue. It'll program correctly via SPS and Tech ii. But after shutting off the car, it "loses" its programming
What is the power source for retaining the information? Capacitor in the circuit? Battery back-up? NVRAM chip?
PCBs of that era in other devices use back-up batteries that have to be changed every few years. That seems unlikely for an automotive application but 2005 seems early for NVRAM.
If the chip that stores the data requires power to retain that data and the power isn't there the data is lost.
I don't suppose anyone has looked up all the chips on the boards and tracked down the data sheets?
I love where your head's at Dads2kconvertible.
I know very little about electronics but I am trying to learn to fix this problem. that's a great idea to look into. The only chip I've looked up is the EE prom which is a SOP8 95080 series.
Originally Posted by Dads2kconvertible
What is the power source for retaining the information? Capacitor in the circuit? Battery back-up? NVRAM chip?
PCBs of that era in other devices use back-up batteries that have to be changed every few years. That seems unlikely for an automotive application but 2005 seems early for NVRAM.
If the chip that stores the data requires power to retain that data and the power isn't there the data is lost.
I don't suppose anyone has looked up all the chips on the boards and tracked down the data sheets?
Last edited by the_slo_vette; Sep 14, 2023 at 06:56 PM.
What is the power source for retaining the information? Capacitor in the circuit? Battery back-up? NVRAM chip?
PCBs of that era in other devices use back-up batteries that have to be changed every few years. That seems unlikely for an automotive application but 2005 seems early for NVRAM.
If the chip that stores the data requires power to retain that data and the power isn't there the data is lost.
I don't suppose anyone has looked up all the chips on the boards and tracked down the data sheets?
Missing resistors. Look at the edge shape of he solder on the pads and can see where the resistor popped off from where they were soldered in place. As for header solder joints, would clean them up some more to see if some of them need to be re-flowed,
Sure looks like something missing there... The car I'm looking at will be back in in a week or so for me to spend some serious time on. Guy reported that the brake lights and things are actually intermittent. Work sometimes, other times not... So could be a bad solder on board or something in the harness. I will certainly pull the board & compare to these pics & provide some feedback on the possible missing part....
Didn't Massachusetts pass a right-to-repair law recently? Anyone used that to try and get schematics for some of these problematic parts?
Yes for all states, due to the fall out of the Farmers verse John Deer, and since GM did have some vendors repairing their boards, electrical board schematics are available as well.
electrical board schematics are available as well.
From where?
It sure would be helpful to see a schematic and layout.
Here is one from a pinball machine released in 2005. With this documentation it's relatively easy to source parts needed for repair.
I don't think you will find a schematic for it. They can be cloned, but I only know of one person that can do it and he has done it for me on a 05 Conv. Dino also knows him so what he is telling you will work. Expensive yes, but it took a lot of work to figure it out and honestly the driveway artwork is way more expensive then fixing it.
Yes for all states, due to the fall out of the Farmers verse John Deer, and since GM did have some vendors repairing their boards, electrical board schematics are available as well.
GM has never provided this source to just anyone. I have never seen these available without having knowing someone. I doubt anyone at GM even has them since these were sourced products. You would need to know someone in Delphi that cared enough to not have deleted or thrown them away when GM discontinued them. I have talked myself blue to them trying to get this info so that we could rebuild them when I was at Zip.
On another note you also can't just buy a BCM with the same part number, that same BCM was used by both the auto tops and manual tops and once it is initially programmed it can't be changed. Even with a TechII and changing the options of the top in the BCM it will not change the outputs of the BCM for the top. It has to be what is called re greened which takes it back to what it was before the initial program. This can only be done by GM which they do not do this now and a very very very few individuals. One of those is a friend of mine and it is where Dino is getting his done, so if you buy one from Dino then it will work like he described to you.
Thanks
Justin
Last edited by J.Abbott; Oct 12, 2023 at 08:05 PM.
Could you get me in touch with this guy? I've bought three BCMs
Originally Posted by J.Abbott
On another note you also can't just buys a BCM with the same part number, that same BCM was used by both the auto tops and manual tops and once it is initially programmed it can't be changed. Even with a TechII and changing the options of the top in the BCM it will not change the outputs of the BCM for the top. It has to be what is called re greened which takes it back to what it was before the initial program. This can only be done by GM which they do not do this now and a very very very few individuals. One of those is a friend of mine and it is where Dino is getting his done, so if you buy one from Dino then it will work like he described to you.
Thanks
Justin
One off eBay, one through a diagnostic shop's "source", and one from Corvette Recycling. I have the one from Corvette Recycling in and everything works except the airbag light is on due to a "option programming error"
Another failed 2005 BCM
