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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 09-21-2011, 07:39 PM
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bluebee bluebee is offline
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Do I have the correct location for the E39 battery safety terminal explosive charge?

Just curious, where is the battery disconnect explosive charge in this picture?

I searched the bestlinks, and found only this:
- How the battery disconnect explosive charge works in an accident (1)

But there were no pictures of the location of the explosive charge in that thread.

I ran a 'regular' search for "explosive charge" and "explosive battery disconnect" (and a few others), most of which got tons of threads, but, scrolling through the first few pages showed no picture of the location of the explosive device itself.

Realoem had this (but again, no explosive charge):


Googling for "E39 battery explosive charge" I find the term "battery safety terminal", which, further googling, gets me this "BST" E90 thread:
- Battery Safety Terminal exploded & disconnect the starter cable

From that, can I 'surmise' that the picture below of my E39 has the correct location for the BST circled?

Also, what is that white plastic box for that is just above the battery?

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Last edited by bluebee; 09-21-2011 at 07:40 PM.
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  #2  
Old 09-21-2011, 07:54 PM
JimLev JimLev is offline
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The explosive caharge is on the positive cable just past the clamp. See the small wires, they detonate the charge.
The white cover has more big amp fuses (50 to 100 amp) behind it......don't you have a Bentleys?

Last edited by JimLev; 09-21-2011 at 07:57 PM.
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  #3  
Old 09-21-2011, 08:15 PM
rdl rdl is offline
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The explosive disconnect is the circled "BST" in you picture. It's triggered by the MRS (airbag/seatbelt/etc) module in the event of an accident.

The white cover with the arrow "what is this?" is a fuse box for F100 -> F106

Regards
RDL
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  #4  
Old 09-21-2011, 10:12 PM
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bluebee bluebee is offline
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Quote:
Originally Posted by JimLev View Post
See the small wires, they detonate the charge.
I don't actually see the small wire in my own pictures so I'll have to check tomorrow in the daylight. I do see two large wires.


Quote:
Originally Posted by JimLev View Post
don't you have a Bentleys?
I'm sorry. I didn't think to look there. Most of the time, I find the Bentleys almost useless.
- Are the Bentleys nearly as useless to you as they are for me?

I do have the paper & PDF Bentleys. PDF is vastly easier to search. Page 121.3 has the first mention of the Battery Safety Terminal (repeated at page 400-9).



Page 121-10 shows another diagram of the BST:


Quote:
Originally Posted by rdl View Post
The explosive disconnect is the circled "BST" in your picture.
Thanks. I found it. Here it is in my 2002 E39 just after I replaced the battery:


Quote:
Originally Posted by JimLev View Post
The white cover has more big amp fuses (50 to 100 amp) behind it......
Ah. I had thought there were only 4 fusebox locations in the E39.

This tells me there are five!
  1. Glovebox
  2. Passenger side filter ebox
  3. Passenger side underseat carpet
  4. Trunk battery compartment panel 1
  5. Trunk battery compartment panel 2
I'm trying to map out all my fuses, one by one, to put them in a spreadsheet. The first task is finding them; the main task, after that, will be to identify the purpose & amperage of each one (and to make sure I have a spare on hand for each).

Quote:
Originally Posted by rdl
The white cover with the arrow "what is this?" is a fuse box for F100 -> F106
Thanks. So far I've only identified F46 -> F66 (although I'm not sure what an 'onboard monitor' is just yet as there is absolutely no mention of it in the Bentleys).
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Last edited by bluebee; 09-22-2011 at 06:40 AM.
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  #5  
Old 09-21-2011, 10:25 PM
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bluebee bluebee is offline
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I didn't find any pictures of activated E39 BSTs, but here's an E60:
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  #6  
Old 09-23-2011, 05:32 PM
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bluebee bluebee is offline
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Here is a nice pic, from JimLev, of the high-amperage fuses (fusible links?) under the white cover above the battery:



And, older E39s apparently have four relays (instead of the three that I have):
  • Rear window defogger relay
  • Central locking relay
  • Unloader relay,
  • Fuel pump relay <== only in older E39s
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  #7  
Old 03-09-2013, 01:45 PM
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bluebee bluebee is offline
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For reference, RDL added a nice diagram of G19 explosive disconnect over here today:
Quote:
Originally Posted by rdl View Post
The explosive safety disconnect is intact if the car starts without a jump at the engine bay post.

When activated (i.e. discharged to sever the circuit) it cuts the circuit running from the battery's +ve post to the starter, engine bay jump start post and alternator => impossible to start the car from the battery.

For those interested, the safety disconnect is located on the +ve battery terminal. Item G19 on the locator picture from WDS.

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Each repair should invariably add to our knowledge base by the process of inexorable incrementalism.
Your job, in return, is to read the suggested threads, where the best people will always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #8  
Old 03-10-2013, 04:34 AM
Whorse Whorse is offline
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If I removed the explosive charge would any sensor be aware of it and give me an airbag light or something? Here in New york Ive had people hit me and run and luckily I was in older vehicles that I would be able to drive (even with 3 wheels) long enough to get a license plates or view of the driver. One time I was in and accident where if i didn't get the car moved there would of been a 10 car pile up. I drove my e30 with the frame rail wrapped around the alternator and the motor pointing to the right about 25degrees. In an e39 I'm "Dead" in the water. or **** out of luck if i get rear ended and the airbags go off breaking my face and then killing the engine while the scumbag in his 1988 toyota drives off.
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  #9  
Old 03-10-2013, 05:14 AM
JimLev JimLev is offline
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Hi Whorse, haven't seen you around for a while.
Don't think anyone has ever asked that question before.
You could try unplugging the little connector that detonates the charge and see if it gives you a fault.
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  #10  
Old 03-10-2013, 07:21 AM
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bluebee bluebee is offline
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Quote:
Originally Posted by JimLev View Post
You could try unplugging the little connector that detonates the charge
Just curious ... do you mean unplugging this little connector in the blue circle?

Does that go to connector X1770? Is it in any of the photos in this thread?

It's hard to visualize what the explosive charge is connected to from these pictures [ before it goes to the MRS (airbag/seatbelt/etc) module ].
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__________________
Each repair should invariably add to our knowledge base by the process of inexorable incrementalism.
Your job, in return, is to read the suggested threads, where the best people will always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need

Last edited by bluebee; 03-10-2013 at 07:24 AM.
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  #11  
Old 03-10-2013, 08:42 AM
JimLev JimLev is offline
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Quote:
Originally Posted by bluebee View Post
Just curious ... do you mean unplugging this little connector in the blue circle?

Does that go to connector X1770? Is it in any of the photos in this thread?

It's hard to visualize what the explosive charge is connected to from these pictures [ before it goes to the MRS (airbag/seatbelt/etc) module ].
Bluebee, that's it.
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  #12  
Old 04-26-2013, 08:39 AM
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bluebee bluebee is offline
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For the record, the BST activated in an accident recently and the user's thread was updated today with nice videos explaining the BST:
Quote:
Originally Posted by Fudman View Post
It's called the battery safety terminal (BST). See this:

http://www.bimmerfest.com/forums/sho...d.php?t=570030

See also:
- Where to find the battery explosive charge emergency quick disconnect (1) (2)
__________________
Each repair should invariably add to our knowledge base by the process of inexorable incrementalism.
Your job, in return, is to read the suggested threads, where the best people will always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #13  
Old 11-25-2013, 06:29 PM
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bluebee bluebee is offline
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For the record, we might get a good picture of an exploded BST from this thread today:
> E39 (1997 - 2003) > E39 Shorted Alternator Lead

Quote:
Originally Posted by youngnotold View Post
bartelbe,
Thank you. I had just posted a new thread about the location of that cable. Do you think it is possible I set off the BST when I shorted the alternator lead? Anyway, thank you for the help. I was going to say that searching for that cable in a cold garage in Ohio is no fun. But, then see where you are from MN. 27 f now seems tropical !
__________________
Each repair should invariably add to our knowledge base by the process of inexorable incrementalism.
Your job, in return, is to read the suggested threads, where the best people will always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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  #14  
Old 02-01-2014, 05:40 PM
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bluebee bluebee is offline
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Sometimes I wonder why people ask questions, and receive help, and never post a picture when asked. sigh.

Anyway, Saint Q posted a nice graphic of the BST today, over here:
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Each repair should invariably add to our knowledge base by the process of inexorable incrementalism.
Your job, in return, is to read the suggested threads, where the best people will always add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need
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