So I tried searching before posting this, and couldn't get a definite answer. I have this code as "Current" on my 2002 Z06 that I just recently bought. The airbag light is on (the service active handling shows once you start moving as well, not sure if it is related).

From what I gather, B1001 means that the BCM didn't get paired to a replaced SDM? How can I go about pairing these? Would this also cause the service active handling message to show?

 

There is a service bulletin that states if the BCM is replaced and reprogrammed with the proper RPO codes the ignition switch must be turned off for 20 seconds before starting the car to save it to the BCM. If the procedure is not done properly you will get the B1001. I think to reprogram the BCM requires a Tech 2 and access to TISWEB to get the download to program the EEPROM in the BCM.

If the SDM was replaced with a SDM from another vehicle the Restraint ID in the SDM won't match what is in stored in the BCM, and the VIN stored in the SDM won't match the VIN stored in the PCM, and if they don't that will also set the code. These things can be checked with a GM Tech2 Diagnostic tool. If you know someone with a Tech2 this can probably be done fairly easily. Not sure if a used (from another car with no airbag deployment) SDM can be reprogrammed. It may require reprogramming the PCM which will then send the new info to all the various modules. I just don't know.

I don't think the service active handling is related. See if you have any codes for the EBTCM or PCM. It might just be a bad connection on one of the wheel sensors.

 

I don't think I know anyone with a Tech 2 tool, but I am going to a tuning shop next Friday that specializes in GM so I will ask them if they know how to do it. Thanks for the explanation!

 

There are 3 'types" of things that need to be programmed into a replaced BCM:

1) VATS key code and PCM password sync: The key-ON and Off sequence in the factory service manual does this. All you need is the key and 30 minutes of your time. Car won't run unless you do this. Often called the "PCM-BCM Relearn" procedure.

2) RPO coding : Tells the BCM what your VIN is, and options your car has, like if it is a convertible, automatic, auto-climate control, fog lights...You need a Tech-2 to do this, but your car can be driven even if the RPO codes are not set correctly. I am not sure the BCM really "cares" what VIN is programmed into it.

3) SDM (airbag control module) serial number : The BCM has a memory "slot" for the last 4 digits of the SDM ID number (or serial number?? or part number??). Whenever the car is started, the SDM checks if the ID stored in the BCM matches its own (SDM) ID number. If it doesn't, the airbag light stays ON, the airbags are disabled, and the SDM sets a DTC B1001 ("Configuration Error"). You can reset this thru the DIC, turning off the Airbag warning light and enabling the airbags, so you can drive the car with functional airbags, but you have to do this everytime you start the car. To program the correct SDM ID number into the BCM, a Tech-2 AND a connection to the GM Service computer is needed. Now for worse news, ONLY brand-new, never-been-programmed BCMs allow the SDM ID number to be written into it. What that means, is that a used BCM can never be reprogrammed for this, and new BCMs are becoming scarce, as the part is obsolete. It is not known if "rebuilt" BCMs can be programmed for this (meaning that the rebuilding vendor can reset the BCM to the virgin state).

 

That clarifies a lot, thank you. I just recently bought this car, so I have no idea if either the SDM or the BCM has been replaced. Is there anyway I can check? Or is there anyway I can check if one was used or brand new?

If the car got into a wreck prior to, and airbags got deployed, would it be necessary to replace the SDM?

 

Yes, the SDM is a one-time use. It cannot be reset/reused after it deploys the airbags.

 

So if the BCM is the same from factory, but the SDM has been replaced, I can't pair the SDM to it? Regardless of circumstances?

 

I believe that the BCM is only a one-time-program for the SDM serial number, but I am not 100% sure....I have done tons of research and I don't find a lot of info on this.....I think it would have been dumb for Chevy to have set it up like this, where in your situation (repair after airbag deployment) you would have to replace the SDM and the BCM. In any case, the programming of the BCM with the SDM sn needs a Tech2 and a connection to the GM service ($ subscription fee).

http://acdelcotechconnect.com/shop-p...ogram/tis2web/

I have a Tech2 and have been looking for step-by-step instructions on how to do this....but no luck so far...I may just a buy a days subscription and try it.

Look at the BCM, see if it has any permanent marker writing on the case (like salvage yard often does).

 

K-Spaz recently used TISWEB to download the stock PCM tune for his '98. He said tech support was helpful even before he paid the subscription fee for the download.

I was looking again at the troubleshooting procedure for the B1001. It does say that in addition to the Restraint ID (last 4 digits of the SDM part number) needs to match the BCM. It also says the VIN stored in the PCM has to match the VIN stored in the SDM.

The SDM repair procedure also mentions that when the SDM is replaced (with a new one because that is what the dealer would do) it says the B1001 code can be set. It is rather vague on how you go about setting the SDM part number in multiple modules or which modules they might be.

From the manual:
"The AIR BAG indicator may remain ON after the SDM has been replaced. DTC B1001 may set requiring the SDM part number to be set in multiple modules. If the indicator remains ON after enabling the SIR system, perform the diagnostic system check and follow the steps thoroughly to ensure that the SDM is set properly."

 

I wished a knowledgeable GM tech could solve this "mystery".....

I attached a document of all the info I could find on the DTC B1001 code.

 

ersatz928, I reprogrammed a 2004 bcm into my 1999 frc, I believe that it is able to be reprogrammed. Steve

 

Are you saying that you took a used BCM from a 2004 reprogrammed it and it and the SDM module did not throw a B1001 code?
Can you be more specific as to what you had to do to get the RPO codes, VATs and the SDM to all to work? Thanks.

 

Are you saying that you took a used BCM from a 2004 reprogrammed it and it and the SDM module did not throw a B1001 code?
Can you be more specific as to what you had to do to get the RPO codes, VATs and the SDM to all to work? Thanks In a word yes. I had to go through the wiring for both bcm's to see what was similar and what was not. Only had to remove one wire from the '99 harness (did not cut it I taped over the connector, then folded the wire over and taped it to itself. I did not use tis as I was having computer compatability issues. I used the procedure in the manual for the initial sync. then used a tech II for programming the options. It has been a few months, so far no warning lights or codes. Steve

 

Are you saying that you took a used BCM from a 2004 reprogrammed it and it and the SDM module did not throw a B1001 code?
Can you be more specific as to what you had to do to get the RPO codes, VATs and the SDM to all to work? Thanks in a word yes! I went through the wiring diagrams for both years of the bcm to see what wiring differences there would be. I removed one wire from my '99 and the fuse that supplied power to that wire. then used the procedure in the manual for the sync. (key on for 30 min, key off for 30 seconds, do this 2 more times then key off for 30 seconds after that start the car) may have to check the manual to see if above procedure is correct. I then used a tech II to program in the options. its been a few months but I have do not have any codes or lights. Steve

 

Are you saying that you took a used BCM from a 2004 reprogrammed it and it and the SDM module did not throw a B1001 code?
Can you be more specific as to what you had to do to get the RPO codes, VATs and the SDM to all to work? Thanks in a word yes! I compared the wiring diagrams from both years of the bcms '99 & '04 removed one wire from the 99 harness (taped wire back into harness) and the fuse that supplies power to it. Used the procedure in the manual to sync everything together. Used a tech II to program the options. So far its been a few months but I have not codes or warning lights on. Steve














































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Thanks for that information. There isn't much detailed info for the B1001 code.
FYI. If you click REPLY to a previous post it will automatically quote that post and you can post your reply below it.
Also if you click EDIT in your posts, you will have the option to delete the duplicate posts.

 

thank you for the editing information. my posting prowess is rather poor. I had to retype the above information 3 times! that was irritating. Steve

 

99blue frc : Sorry, but please clarify which of the three below BCM programming things you did:

1) VATS key code and PCM password sync: The 30 minute key-ON and Off sequence in the factory service manual does this.

2) RPO coding : Tells the BCM what your VIN is, and RPO options your car has. You need a Tech-2 to do this

3) SDM (airbag control module) ID number that gets programmed into the BCM. You need a Tech2 AND and internet connection to the GM service website (or you took the car to a Dealer or Mechanic who has this capability)

 

I did all of the above. since the bcm was from a 2004 I had to do everything. Yes , I did use a tech II. I am not sure when the sdm id number was programmed, either when I did the initial 30 min on and off procedure or when I did the set the rpo options. I do know that I did not have the air bag light on the dash driving down the road. It seemed to fix all the non comm codes too! Steve

 

Just to clarify: You did or did not have to download the the programming information from GM TISWEB.

I have been search through the various model years and can't find any information regarding programming requirements, if a new or good SDM module from another car is installed.