Airbag light: Battery Firing Circuit

inkey$ · Post by **inkey$** » Mon Jan 23, 2023 4:52 pm

Just back from an Inspection 2 and investigation to the airbag light I have on my 3.0se. The code it is throwing is as follows:

SBSR: satellite B-pillar right - 98F Resistance, firing circuit, safety battery terminal (E85), or belt tensioner, rear right (E6x), too high

My go-to indy reckons its a fault with the battery positive firing circuit, which is a ball-ache in terms of both cost and effort - £200+ from BMW plus labour in deconstructing the interior to replace.

Anyone know if it can just be coded out from the M54 ECU?

enuff_zed · Post by **enuff_zed** » Mon Jan 23, 2023 4:55 pm

Is it not just the right b-pillar module?
Easy to access behind the trim.
Need to replace with a compatible item, so if it is that you need to get it's part number

bigwinn · Post by **bigwinn** » Mon Jan 23, 2023 4:56 pm

Don’t you just need a new module and use winkfp to code it to the car?

I’ve got a left one only at the moment sadly

enuff_zed · Post by **enuff_zed** » Mon Jan 23, 2023 5:00 pm

bigwinn wrote: ↑Mon Jan 23, 2023 4:56 pm Don’t you just need a new module and use winkfp to code it to the car?

I’ve got a left one only at the moment sadly

That's why I asked as I have a right one but not sure if they are all compatible.

inkey$ · Post by **inkey$** » Mon Jan 23, 2023 5:32 pm

Speaking as a complete electrical/module novice do you think its worth trying to replace the right (drivers side?) b-pillar module first and see if it then clears?

enuff_zed · Post by **enuff_zed** » Mon Jan 23, 2023 5:45 pm

inkey$ wrote: ↑Mon Jan 23, 2023 5:32 pm Speaking as a complete electrical/module novice do you think its worth trying to replace the right (drivers side?) b-pillar module first and see if it then clears?

I believe you need to then code it to the car as Stuart suggests.

inkey$ · Post by **inkey$** » Mon Jan 23, 2023 5:52 pm

this is the RealOEM breakdown for my car. So I’m after the part number for the 04 Airbag Module, right door?

: 471BB7A0-C3B6-448C-AB5F-0E485B9A697A.jpeg (89.3 KiB) Viewed 563 times

enuff_zed · Post by **enuff_zed** » Mon Jan 23, 2023 6:27 pm

bigwinn, clarify for me if you can. What is needed? The actual airbag or the B-pillar module (silver ecu thingy)
I think I have both but would need to check part number compatibility.

mac27040 · Post by **mac27040** » Mon Jan 23, 2023 6:42 pm

i would say its not the SBSR but the seat belt tensioner that needs replacing, first check under seat that you haven't moved the seat and caught a wire.

inkey$ · Post by **inkey$** » Mon Jan 23, 2023 6:59 pm

Thanks for all the advice so far. It’s weird as when I bought the car there was no light and it was only after owning for a few days (including moving seats etc) that the light appeared. Feels odd that if it was the battery firing circuit that it would happen just after I bought it.

That said, the car had been sat for a while during the last 12 months and hasn't done a lot of miles, and I know the battery terminals can corrode and throw up issues.

bigwinn · Post by **bigwinn** » Mon Jan 23, 2023 7:10 pm

I would say it’s the module as opposed to the actual bag

Assume you have had a good old go at clearing it with inpa?

And of course looking for the root cause which I assume is water ingress?

inkey$ · Post by **inkey$** » Mon Jan 23, 2023 7:14 pm

bigwinn wrote: ↑Mon Jan 23, 2023 7:10 pm I would say it’s the module as opposed to the actual bag

Assume you have had a good old go at clearing it with inpa?

And of course looking for the root cause which I assume is water ingress?

Codes cleared and investigated using INPA. Root cause wise, when I bought the car there was a little water in the boot but clear of the battery. I guess it could have had some impact at some point though.

Reading into the BST error, on an E90 forum I read you can code this error out using NCSExpert of Bimmergeek ProTool. Thats on an E90 of course.

bigwinn · Post by **bigwinn** » Mon Jan 23, 2023 7:33 pm

Yeah same principle on the e90

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