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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 07-20-2010, 06:24 PM
orbatrin orbatrin is offline
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Exclamation Replacing battery triggered Seat belt/Airbag

Need Help.

I replaced the battery in my 2006 325i with an Autozone Duralast battery and after starting the car up, my display showed that seat belt and Airbag light is on. I know both items are in working condition but seems to me that replacing the battery/disconnecting the terminal caused the fault lights to come on. Does anybody have the same issue or a fix for this? perhaps a reset? Thanks for your help.

Last edited by orbatrin; 07-20-2010 at 06:49 PM.
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  #2  
Old 07-20-2010, 08:37 PM
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mclaren mclaren is offline
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There was a thread quite a while ago about replacing batteries and how something had to be done to tell the computers it had been replaced or it wouldn't charge properly and other problems.
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  #3  
Old 07-20-2010, 08:41 PM
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marinekilz marinekilz is offline
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the positive battery cable has a pyro explosive in the terminal connected to the airbag system. I am betting you disconnected the cable by accident. Make sure all wires are plugged into the terminal/ on the side of the terminal.
and yes you should have the dme informed of the new battery being installed, worst case if you don't the veh will burn out that battery prematurely

Last edited by marinekilz; 07-20-2010 at 08:42 PM.
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  #4  
Old 07-21-2010, 03:21 AM
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Zooks527 Zooks527 is offline
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Quote:
Originally Posted by marinekilz View Post
the positive battery cable has a pyro explosive in the terminal connected to the airbag system.
I think you meant to say "the airbag system has a pyro explosive connected to a cable to the positive battery terminal", but, other wise, yeah.

Unless I have to worry about the battery cable going off.
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  #5  
Old 07-21-2010, 05:51 AM
roadkillrob roadkillrob is online now
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My understanding is that these cars need the computer to be told that the battery has been replaced - basically the computer monitors the battery and charges accordingly, if the battery is replaced with new, the computer needs to know or otherwise it may charge it incorrectly. I have read posts that others have had to replaced the replaced battery within months as it was being over under charged. Not sure if this senario would also lead to warning lights on the dash also, maybe disconnect the battery again and let it sit for a bit and see if the lights come back on or if they go out after a day of driving, otherwise it is probably a trip to the dealer
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  #6  
Old 07-21-2010, 12:29 PM
orbatrin orbatrin is offline
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I disconnected all cables including the green and red cable connected to the plastic assembly located on the battery. Once I installed a new duralast battery, I plugged everything back in as should. The seat belt and airbag light has been on for two days now. I will attempt to register the battery at the shop and see if that fixes the issue. Is anybody aware if their is a fuse in the black container located on the battery assembly?
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  #7  
Old 07-23-2010, 08:47 PM
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dean2c dean2c is offline
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Quote:
Originally Posted by Zooks527 View Post
...Unless I have to worry about the battery cable going off.
Sorry if you already know this, but I couldn't tell from your post. The black box on top of your positive terminal is the "battery safety terminal", which has a small pyrotechnic charge that fires in the event of an airbag deployment. I believe it is intended as a safety measure after an accident to reduce the risk of an electrical fire. This post shows one post-deployment: http://www.e90post.com/forums/showthread.php?t=6313

When it goes off, the hazards, BMW assist telematics, and other low-draw circuits remain active, but there won't be enough current to start the car.
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  #8  
Old 07-23-2010, 11:01 PM
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Quote:
Originally Posted by dean2c View Post
When it goes off, the hazards, BMW assist telematics, and other low-draw circuits remain active, but there won't be enough current to start the car.
Hmmm... interesting point.

In theory, it cuts all electrical power (and the engine) so you don't have a small spark that ignites a fire after a crash. Yet, the hazards go on... doors unlock... BMW Assist calls for help... How? Do those subsystems have another electricity source?

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Old 07-24-2010, 04:23 AM
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There are two hot (+) cables. One handles high current items (alternator, fuel pump and starter) and has the pyrotechnic device (battery safety terminal) that detonates when the crash sensor activates to remove power to those items. The other cable handles the low power and emergency equipment, like BMW Assist w/collision notification, the hazard flashers, interior lights/auto emergency door unlock, etc.
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  #10  
Old 07-24-2010, 07:21 AM
orbatrin orbatrin is offline
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Please see my original post. What went wrong when I changed batteries and why did it trigger seat belt light and SRS lights? If I register the battery will it fix the issue? My black box did not explode and my car starts up even better now with the new battery. Any suggestions?
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Old 07-24-2010, 09:33 AM
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Quote:
Originally Posted by BerfsBimmer View Post
There are two hot (+) cables. One handles high current items (alternator, fuel pump and starter) and has the pyrotechnic device (battery safety terminal) that detonates when the crash sensor activates to remove power to those items. The other cable handles the low power and emergency equipment, like BMW Assist w/collision notification, the hazard flashers, interior lights/auto emergency door unlock, etc.
Thanks for the insight.

- Mike
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Old 07-24-2010, 09:36 AM
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Quote:
Originally Posted by orbatrin View Post
Please see my original post. What went wrong when I changed batteries and why did it trigger seat belt light and SRS lights? If I register the battery will it fix the issue? My black box did not explode and my car starts up even better now with the new battery. Any suggestions?
Your problems started when you disconnected the old battery. It simply sent an error through the system as the safety equipment had losts its power. You need to have the codes reset. Should be as good as new after that.

- Mike
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Gone, but never forgotten... my E70 X5 35d, E90 335i, E46 330i, E36 328i, E70 X5 3.0si, E53 X5 3.0i.
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  #13  
Old 07-24-2010, 09:53 AM
chasvs1201 chasvs1201 is offline
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Quote:
Originally Posted by Emission View Post
Your problems started when you disconnected the old battery. It simply sent an error through the system as the safety equipment had losts its power. You need to have the codes reset. Should be as good as new after that.

- Mike
So if I simply remove the negative terminal to do a steering wheel swap I'll need to have it reset? Reason for disconnecting the battery is because I'll be removing the airbag as part of the process.
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  #14  
Old 07-24-2010, 04:02 PM
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marinekilz marinekilz is offline
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Quote:
Originally Posted by dean2c View Post
Sorry if you already know this, but I couldn't tell from your post. The black box on top of your positive terminal is the "battery safety terminal", which has a small pyrotechnic charge that fires in the event of an airbag deployment. I believe it is intended as a safety measure after an accident to reduce the risk of an electrical fire. This post shows one post-deployment: http://www.e90post.com/forums/showthread.php?t=6313

When it goes off, the hazards, BMW assist telematics, and other low-draw circuits remain active, but there won't be enough current to start the car.
If you changed the battery, the airbag light should not come on. The BST has connectors and cables connected to the positive terminal, I would make sure all the connectors are plugged properly into the positive terminal. That is where your porblems lies, or if you connected the battery, turned on the key before you plugged the other connectors in would also set the light. I would just have the faults deleted and the battery registered before you get too worried. And NO registering a battery will not fix a airbag system problem. Once a airbag fault is set, all you can do is delete the fault, disconnecting the battery will not reset the airbag system and shut the light off

Last edited by marinekilz; 07-24-2010 at 04:04 PM.
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  #15  
Old 07-24-2010, 04:09 PM
Ryan M Ryan M is offline
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I couldn't tell you how many batteries I've changed at work. I've never had an airbag or seatbelt light come on.....let alone both. Something is wrong because they shouldn't come on simply from disconnecting the battery.
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  #16  
Old 07-24-2010, 04:25 PM
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marinekilz marinekilz is offline
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I had it happen once, but I accidental pulled out a connect that was in the positive cable on a x5. plugged in the connector, had a shop with a gt1 delete the faults and the car was good to go.
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  #17  
Old 07-24-2010, 07:58 PM
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Emission Emission is offline
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I think once the fault is triggered, it needs to be reset from the outside (I don't think it will "self-reset").

- Mike
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I am fortunate to have unique press cars delivered weekly, but I own:

'13 Audi Q5 2.0T Quattro 8AT
'86 Porsche 911 Turbo 4MT


Gone, but never forgotten... my E70 X5 35d, E90 335i, E46 330i, E36 328i, E70 X5 3.0si, E53 X5 3.0i.
~~~~~~~~~~~~~~~~~~~~~~~~~
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  #18  
Old 07-25-2010, 09:59 AM
Ryan M Ryan M is offline
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Correct, the airbag light will not reset without a tool.
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  #19  
Old 09-18-2010, 11:41 AM
kfeehan kfeehan is offline
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Changed battery and warning light came on

Had same problem put in new battery for 530 xi and the seat belt/airbag warning light has been on ever since. Can I buy a tool to reset, found on for earlier models but not 2006. Anyone know where to go to get one....hate the dealerships!!! Also this was about 8 months ago, should I be concerned the system isn't working, is it wrecking the battery? Runs fine except for light!
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  #20  
Old 09-18-2010, 05:25 PM
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RaceBlood RaceBlood is offline
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How can you hate a dealership? We are talking about safety here, not a air filter. You buy a BMW for all the things that make it a BMW, highly engineered and safety, then you discount the safety feature in order to avoid a dealer? My dealers in Chicago kiss your ass and win your business by doing it right, we have 7 in a 100 miler circle...

Thats plain idiotic, and your insurance company will not lay a dime for your injuries if you have purposely faulted the safety systems, not to mention all your broken bones...
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Last edited by RaceBlood; 09-18-2010 at 05:27 PM.
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