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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 10-16-2013, 08:24 AM
blackjuju2 blackjuju2 is offline
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Location: Gahanna, Ohio
 
Join Date: Oct 2013
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Mein Auto: 2008 335i
e90 ibs

my dealer is telling me i need am intelligent battery sensor replaced at the cost of $425.00, i have seen them on e-bay for $215.00 and they look pretty simple. i am sure the part must be coded to the car. i am getting a bit perturbed with the idea of not being able to do routine maintenance such as changing out a battery on my car. i love driving this car.
how can i get around some of this.
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  #2  
Old 10-16-2013, 08:48 AM
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CALWATERBOY CALWATERBOY is offline
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Mein Auto: 2009 E93 N54
Quote:
Originally Posted by blackjuju2 View Post
my dealer is telling me i need am intelligent battery sensor replaced at the cost of $425.00, i have seen them on e-bay for $215.00 and they look pretty simple. i am sure the part must be coded to the car. i am getting a bit perturbed with the idea of not being able to do routine maintenance such as changing out a battery on my car. i love driving this car.
how can i get around some of this.

Exactly why does it need replacement - detail please?
How did they troubleshoot it - detail again?

This looks like a simple assy and may be no more than a resistor as a current sense. Wow....item #2 in this illustration.
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  #3  
Old 10-16-2013, 09:02 AM
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CALWATERBOY CALWATERBOY is offline
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.

THIS may be useful info and a better view of what the IBS looks like. Note the blue connector - two wires just as a current sense would have.

Most annoying that nobody's torn one down - if you have a replaced IBS don't throw it out - I'll take it apart! PM for deliv addr.
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  #4  
Old 10-16-2013, 09:11 AM
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CALWATERBOY CALWATERBOY is offline
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Mein Auto: 2009 E93 N54
.

OTOH, I might find THIS! A power monitor, fairly common and very useful in predicting the future; diagnosing the state of the system. Yup, still just resistors, but includes analog to digital processing on-chip - digital output: current, voltage; temp. A number of secondary calc's derived. BMW's cost of electronics? Likely <$5

You N54/52 pilots - need your old IBS! In return, detailed photo teardown thread will be posted. PM me.

blackjuju2?

.

Last edited by CALWATERBOY; 10-16-2013 at 10:20 AM.
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  #5  
Old 10-17-2013, 12:18 PM
fdriller9 fdriller9 is offline
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Mein Auto: '06 AW 330xi
IBS monitors the battery and relays info to the DME. You would need more than a simple current sense circuit to replace it with a DIY setup.
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  #6  
Old Yesterday, 12:24 PM
hunnypuppy hunnypuppy is offline
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Mein Auto: 535i
IBS explanation from BMW:
http://prodcds.bmwuniversity.com/lib...Management.pdf
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  #7  
Old Yesterday, 02:03 PM
CALWATERBOY DUE's Avatar
CALWATERBOY DUE CALWATERBOY DUE is offline
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Location: Fog City, California
 
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Mein Auto: 09 E93 335i somewhat mod
Quote:
Originally Posted by hunnypuppy View Post

IBS - your common battery charging device with data bus to DME as massaged for BMW's specifics. Most interesting is messaging to shut down loads as battery condition changes - unclear if IBS selects which to kill, or DME....?? Maybe should read again.


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  #8  
Old Yesterday, 02:21 PM
hunnypuppy hunnypuppy is offline
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Location: macon
 
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Mein Auto: 535i
DME, IBS only sends the raw data to the DME, DME decides Class A or Class B shutdown. (see manual)

People who disconnect IBS, still works but no real time data only static information assumed by DME
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