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      01-09-2015, 04:53 PM   #1
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Replaced battery now airbag light code 93b2?! HELP :(

Replaced battery now airbag light code 93b2?!

i have a 2008 335i coupe e92 with 34km on it. Replaced the original battery a few days ago and programmed the new battery to the car, ever since then the airbag light and seat belt light remain on ..., scanned it with bmwhat app code is 93b2 safety battery terminal.

checked all connections everything looks fine. Done a bunch of research and people say its either the BST cable or the distribution board on the battery. I replaced both yesterday and tried to clear the code. NO CHANGE both airbag light and seatbelt light are solid.

iv checked everything over many times,have read any threads i can find online with people with similar problems.

ANY SUGGESTIONS ARE APPRECIATED. Thanks a lot
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      01-09-2015, 08:14 PM   #2
PhaseP
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If you are getting this:

93B2 ZK10 / Sicherheitsbatterieklemme
...
widerstand zu gross (ZK)

In English:

93B2 ZK10 / safety battery terminal
....
resistant to large (ZK)


I had this last winter after replacing battery, and this winter when it got cold.

This is because of that tiny connector that goes into the BST (Battery safety terminal), which is the end section of the thick red positive cable that goes into the positive battery post.

In addition to the thick red positive table, there is another thin two wire cable that gets connected to the BST. The code means whether this connector is not placed back, or it is connected but not seated well and making good connection. In my case it was the later.

First make sure you have this tiny wire is connected to the place on BST. If it is connected remove it carefully, spray its pins and the pins on the connector on the BST side for it with a good electrical contact cleaner. Then pry up the two prongy things on the connector that is supposed to keep it tightly seated in its place. And place it back on the BST. Then clear the code and see how it goes.

Last year I had accidentally knocked this tiny thing off from the BST during battery replacement and once removed they get loose. I had cleaned the connector and made it seat well that time which was fine till this winter. This winter from cold looks like it again got lost its connection, I removed it again, cleaned both sides again with contact cleaner, pried up those things on the tiny connector and seated it back, cleared code and it hasn't came back again.

The code is very descriptive in your and my case.

One other possibility wherever the other side of this cable is ending up (probably in the air bag central control system, don't know where it is, but could find it) has a loose connection, but that is low possibility, because you had the problem occur after battery replacement.

I don't know if BMW sells that flimsy tiny connector alone.

I read there is an option of tricking this by connecting a 2 ohm fuse at that wire and not connecting it to the BST, but I don't recommend it unless you can't fix it otherwise. This wire, as you probably already know, in case of an accident is used to fires up a pyrotechnic small device inside the BST which forces the positive battery cable out of the battery post connection (from outside would still look like connected though), and is meant to protect any fire.
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      01-09-2015, 08:56 PM   #3
335inYEG
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Quote:
Originally Posted by PhaseP View Post
If you are getting this:

93B2 ZK10 / Sicherheitsbatterieklemme
...
widerstand zu gross (ZK)

In English:

93B2 ZK10 / safety battery terminal
....
resistant to large (ZK)


I had this last winter after replacing battery, and this winter when it got cold.

This is because of that tiny connector that goes into the BST (Battery safety terminal), which is the end section of the thick red positive cable that goes into the positive battery post.

In addition to the thick red positive table, there is another thin two wire cable that gets connected to the BST. The code means whether this connector is not placed back, or it is connected but not seated well and making good connection. In my case it was the later.

First make sure you have this tiny wire is connected to the place on BST. If it is connected remove it carefully, spray its pins and the pins on the connector on the BST side for it with a good electrical contact cleaner. Then pry up the two prongy things on the connector that is supposed to keep it tightly seated in its place. And place it back on the BST. Then clear the code and see how it goes.

Last year I had accidentally knocked this tiny thing off from the BST during battery replacement and once removed they get loose. I had cleaned the connector and made it seat well that time which was fine till this winter. This winter from cold looks like it again got lost its connection, I removed it again, cleaned both sides again with contact cleaner, pried up those things on the tiny connector and seated it back, cleared code and it hasn't came back again.

The code is very descriptive in your and my case.

One other possibility wherever the other side of this cable is ending up (probably in the air bag central control system, don't know where it is, but could find it) has a loose connection, but that is low possibility, because you had the problem occur after battery replacement.

I don't know if BMW sells that flimsy tiny connector alone.

I read there is an option of tricking this by connecting a 2 ohm fuse at that wire and not connecting it to the BST, but I don't recommend it unless you can't fix it otherwise. This wire, as you probably already know, in case of an accident is used to fires up a pyrotechnic small device inside the BST which forces the positive battery cable out of the battery post connection (from outside would still look like connected though), and is meant to protect any fire.

Thank you very much for your in depth reply.

Yes this connector is VERY flimsy and I'm pulling my hair out trying to figure out the problem. When you say pry up on the pins your talking about the pins on the actual female port on the positive terminal not the 2 wire connection coming from the car?
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      01-09-2015, 10:47 PM   #4
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UPDATE:
Problem fixed, pride up on the gold pins to ensure contact is made, put everything together and reset the code with bmwhat app and wifi obd2.
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      07-29-2018, 10:29 PM   #5
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Quote:
Originally Posted by 335inYEG View Post
UPDATE:
Problem fixed, pride up on the gold pins to ensure contact is made, put everything together and reset the code with bmwhat app and wifi obd2.
Could you post a picture of the gold pins that you are referring to?

I am having the same issue.
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      12-12-2018, 09:49 PM   #6
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Same issue here, any pictures would be appreciated!

Thx!
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      12-13-2018, 03:04 AM   #7
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If it is like the Takata style connectors, they have a safety bridge across the pins which get lifted away when the squib is connected.
It is to prevent accidental detonation by static electricity but if your squib is damaged or someone has tampered with it before, the tab which lifts the bridge may be missing.

See the two tabs above the pins in this pic: http://bmwcentrum.pl/img/products/65/7/1_max.jpg
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      12-13-2018, 05:40 PM   #8
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This below picture has been my final solution. Because after I had fixed it by cleaning the contacts with contact cleaner spray and spreading the pins a bit to make better contact, a year later with winter same code came back.
Then I wrapped it tight pushing into the female side on the BST with electrical tape. No codes ever since.
It is the black electrical tape on the picture. Ignore the small piece of blue painters tape left over from while doing battery replacement (2nd one) Battery is out in the picture as you can tell.
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      04-06-2019, 09:57 PM   #9
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Updating this thread with some helpful info if anyone has this issue in the future...

I was able to code the BST error out with BimmerGeeks Protool the other day.
1. Connect to the car with Protool
2. Select "Airbag"
3. Select "Coding"
4. Set "Battery Safety Terminal" to "Not Active
5. Select "Finalize Coding" and cycle ignition to the car.

Hope this help someone!
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      04-27-2019, 05:03 PM   #10
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Quote:
Originally Posted by Skers 05 View Post
Updating this thread with some helpful info if anyone has this issue in the future...

I was able to code the BST error out with BimmerGeeks Protool the other day.
1. Connect to the car with Protool
2. Select "Airbag"
3. Select "Coding"
4. Set "Battery Safety Terminal" to "Not Active
5. Select "Finalize Coding" and cycle ignition to the car.

Hope this help someone!
By doing this does this deactivate the airbag as well?


Edit: I followed those instructions and all it did was make the light and error stay and couldn't clear it out
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      06-21-2019, 09:58 PM   #11
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Bumping this thread because it just helped me. Last week I replaced the seals in the transmission between the mechatronic and the trans housing. I had a heck of a time getting the car back together and running after, and in my misadventures I had to disconnect and reconnect the battery a few times. The battery bled down while diagnosing, and I charged it at the nut that retains the various sensors on the top of the battery. This is not a good idea, but in the heat of the moment I forgot. 2 Days after my repair job I got the airbag and seatbelt light, but no other issues. I pulled the following error codes:
93d2 93fb 93b2

There isnt much information out there for 93fb, but seemingly it's a wheelspeed sensor. This was unlikely my issue. 93d2 is the passenger airbag, and I thought this could be the issue. However, I know my car hasn't had any issues with the seat mat thus far so I was skeptical for this as the issue. 93b2 is the bst, and i figured this was my most probable cause given that I was messing with the battery a bunch and charged it at a spot it shouldnt have been charged at.

The BST itself seems to be nearly impossible to disassemble without destroying the plastic casing. The 2 wires mentioned here are connected to the top of the battery power distribution box, so that's where I unplugged the connector and re-jigged the pins to try and make better contact. This was all with the battery disconnected. After hooking everything back up I still saw the airbag fault on the dash, so I cleared codes on the airbag module with INPA. The airbag light turned off. I started the car and just took it for a quick spin, it seems as if the fault is gone. If the fault comes back I might try doing this once again and coating the pins with some dielectric grease. Beyond that, my BST may need replacing.
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      07-11-2019, 04:29 PM   #12
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Hello All, I want to thank you, PhaseP, as the electric tape solution worked for me on my E90. I had my battery replaced and they wanted close to $900 to replace both positive and negative battery cables. From your pictures and description, I was able to locate the BST although I could not disconnect it. I pushed it in, wrapped in tightly with electrical tape and cleared the codes. Now no airbag and seat belt error lights. Saved a lot of cash too. Thank you!
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      07-22-2019, 04:57 AM   #13
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Hi all, my positive terminal seems slightly different than the pics posted here. Here's a pic of what it looks like, is circle 1 the connector causing the issue or the connection at circle 2?
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      07-22-2019, 08:59 AM   #14
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My issue was with the little connector labelled #2 above. The actual BST is the one labelled 1. Other than just pushing this connector back in to place I don't think this can really be serviced. Rejigging the pins happens on connector 2.
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      07-22-2019, 10:09 AM   #15
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Quote:
Originally Posted by Ekulz View Post
Hi all, my positive terminal seems slightly different than the pics posted here. Here's a pic of what it looks like, is circle 1 the connector causing the issue or the connection at circle 2?
You have the early style black BST which is no longer made. I had issue with the connection at circle 2. Once cleaned, my light no longer comes on.

If your BST is bad and you replace with the new style, you will need a new wiring pigtail. New style BST do not have a connector at circle 2 and the wires can't be removed from your current BST. The 2 wires after circle 2 connection are cut, re-soldered and shrink wrapped to new wiring. I got some wiring from a local wreck in case my light comes back.
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      07-22-2019, 07:12 PM   #16
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Thanks all for the responses. I gave connection #2 a quick clean and cleared the codes. If it comes back I'll play with the pins and possibly tighten the connection with some electrical tape

This actually happened after I had my rear bumper replaced by the panel beaters from someone rear ending me. I think they disconnected the battery as part of removing the tail lights, and maybe they weren't so careful in doing this. If I can't get the code to stay away I'll probably just contact my insurance again and see what can be done
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