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Username Post: BCM swap 2015 Express
"7th Year" Gold Supporting Member
Posts 2893
03-20-20 07:50 PM - Post#2789086    

Hi All.
I swapped the BCM in a 2015 Chevrolet Express.
Everything works good but I cannot get the airbag light to go out.
It has to do with the code in the SDM not matching the code in the BCM.
Does anyone know if the number can be reset without replacing or resetting the SDM?
And if not does anyone know who could possibly reset the SDM.
It only has 1 airbag in the steering wheel as it is a cutaway.
Thanks all
Old School GM fan FOREVER

Frequent Contributor
Posts 2062
03-21-20 05:57 AM - Post#2789101    

Have you scanned the sirs system to see if there is a code? Could be wrong but I believe the bcm does not control the sirs. Should have lots of time as we are basically locked down, can't even get a take out breakfast here.
"7th Year" Gold Supporting Member
Posts 2893
03-21-20 08:59 AM - Post#2789125    

So the SDM and BCM are paired to each other.
If you swap either with a used one it will conflict.
The code is caused by the confliction.
I need to be able to reset one of the modules so it will learn the code from the other module.
Old School GM fan FOREVER

"7th Year" Gold Supporting Member
Posts 2893
03-30-20 01:23 PM - Post#2789821    

Ok so this morning I swapped the donor bcm back in so I could post the code.
It is the one and only problem with the swap.
The code simply states no communication with the Airbag module.
There is no communication because the primary key sent by the airbag module does not match the one in the Donor bcm.
The code from my Airbag module is 8065.
Old School GM fan FOREVER

Very Senior Member
Posts 4458
03-30-20 06:52 PM - Post#2789851    

They do get matched but i don't know how with a used module. i know the new ones pair themselves but I've read it's a 1-time thing.
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