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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 02-07-2014, 04:33 PM
Crooky Crooky is offline
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Mein Auto: 320, 328Ci, 323i
Battery disconnect

I thought I would add this.
While changing the battery, after disconnecting it (in disconnecting I also disconnected the lead to the power distribution board on top of the battery(, I inadvertently closed the boot. Needless to say - NOTHING worked and even the over ride key did not work. The car needs some power to the electrical circuits.
The only way to remedy was to go thru the rear seat - which entails unlatching the seat latches - located in the boot under the parcel shelf.
So the procedure is -
1. Undo lower rear seat bolts.
2. Pull seat clips out of their locating sockets in both lower corners
3. Lift/raise rear seat back high enough to provide a space through which someone can crawl (you'll need to support the seat somehow - I used a piece of wood about 18" long)
4. Enter boot space and reconnect battery terminals
5. Boot release should now work
6. Lower seat
7. Enter boot, release top seat latches
8. Relocate lower seat clips
9. Relatch top latches
10. Oh, and change the battery - remembering not to close the boot while it is disconnected

If you have not disconnected the lead to the distribution board, applying power to the under bonnet jack should be sufficient to restore sufficient power to open the boot.
BUT while ever the distribution board is disconnected, NOTHING will work.
Lucky for me the doors were open when we closed the boot
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  #2  
Old 02-07-2014, 05:58 PM
CALWATERBOY's Avatar
CALWATERBOY CALWATERBOY is offline
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Location: San Francisco
 
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Mein Auto: 2009 E93 N54
Quote:
Originally Posted by Crooky View Post
I thought I would add this.
While changing the battery, after disconnecting it (in disconnecting I also disconnected the lead to the power distribution board on top of the battery(, I inadvertently closed the boot. Needless to say - NOTHING worked and even the over ride key did not work. The car needs some power to the electrical circuits.
The only way to remedy was to go thru the rear seat - which entails unlatching the seat latches - located in the boot under the parcel shelf.
So the procedure is -
1. Undo lower rear seat bolts.
2. Pull seat clips out of their locating sockets in both lower corners
3. Lift/raise rear seat back high enough to provide a space through which someone can crawl (you'll need to support the seat somehow - I used a piece of wood about 18" long)
4. Enter boot space and reconnect battery terminals
5. Boot release should now work
6. Lower seat
7. Enter boot, release top seat latches
8. Relocate lower seat clips
9. Relatch top latches
10. Oh, and change the battery - remembering not to close the boot while it is disconnected

If you have not disconnected the lead to the distribution board, applying power to the under bonnet jack should be sufficient to restore sufficient power to open the boot.
BUT while ever the distribution board is disconnected, NOTHING will work.
Lucky for me the doors were open when we closed the boot

What about attaching a trickle charger?
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  #3  
Old 02-08-2014, 01:23 AM
Crooky Crooky is offline
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Location: Australia
 
Join Date: Feb 2014
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Mein Auto: 320, 328Ci, 323i
As I alluded, if the red lead on the distribution box is also disconnected, no power can get to any of the electrics of the car, so applying any power to the aux power jack, alternator or starter motor can't get to the car. It's a real killer for the unaware. The red lead should never be disconnected.
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Old 02-08-2014, 04:57 AM
fdriller9 fdriller9 is offline
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Mein Auto: '06 AW 330xi
If the battery ground is disconnected, there is no complete circuit anywhere in the car.

Jump points under the hood won't work.
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  #5  
Old 02-08-2014, 08:30 AM
Go Navy Go Navy is offline
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Battery Switch?

The list of options on my 328i showed "Battery Switch". This is the one question my client advisor could not answer. Is there a battery switch somewhere, or is it just something temporarily installed to transport the cars from the factory to dealers without draining the battery?

If there is a battery switch, would it be used to eliminate all loads on the battery if one is away from home for an extended period? I normally use a "smart" trickle charger on my cars if I'm gone for awhile.
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  #6  
Old 02-08-2014, 10:10 AM
fdriller9 fdriller9 is offline
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That's most likely the wire under the back seats. The other end goes to the battery compartment and is connected to a small power supply when the car is being transported to port.

I think it's so they can open the trunk after disconnecting the battery.
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  #7  
Old 02-08-2014, 10:20 AM
CALWATERBOY's Avatar
CALWATERBOY CALWATERBOY is offline
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Quote:
Originally Posted by Crooky View Post
As I alluded, if the red lead on the distribution box is also disconnected, no power can get to any of the electrics of the car, so applying any power to the aux power jack, alternator or starter motor can't get to the car. It's a real killer for the unaware. The red lead should never be disconnected.

>SIGH<

I really should be read posts completely through.


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  #8  
Old 02-08-2014, 10:29 AM
Go Navy Go Navy is offline
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Quote:
Originally Posted by fdriller9 View Post
That's most likely the wire under the back seats. The other end goes to the battery compartment and is connected to a small power supply when the car is being transported to port.

I think it's so they can open the trunk after disconnecting the battery.
So, should I assume it is of no practical use once the car is sold and put into service?
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  #9  
Old 02-08-2014, 10:47 AM
fdriller9 fdriller9 is offline
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Quote:
Originally Posted by Go Navy View Post
So, should I assume it is of no practical use once the car is sold and put into service?
Yea it has no purpose for consumers.
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