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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > 2006xi IBS or battery issue?



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      04-10-2012, 12:48 PM   #1
jacobsed
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2006xi IBS or battery issue?

So my car wouldn't start after I got to work. It powered up fine and everything seemed ok expect that when I pushed the start button I got nothing at all. So I googled the issue and came across a posting that suggested to disconnect the IBS and try to start the car. I did this and it worked!

My battery is original so I expect I do need a new one but until today the car has been fine.

My question is: Is this really a faulty IBS or could it still be a worn out battery and the IBS is functioning correctly by not letting the car start because of a worn out battery?
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      04-10-2012, 01:16 PM   #2
ctuna
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FYI

http://www.google.com/url?sa=t&rct=j...u6bsjagB5SeBCA

It say's in the above link the ibs would throw a code.
I'm betting on the battery especially if you were getting long
cranks before starting.
That's a good trick disconnecting the IBS I hadn't heard of that one before.
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      04-10-2012, 03:53 PM   #3
Tom K.
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Since the IBS controls the charging rate, is your battery still being charged without it?

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      04-10-2012, 10:16 PM   #4
jacobsed
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I don't know, that is a good question. I plugged the IBS back in after I started the car. It seems to be ok after it starts.

So I put a new battery in it and I still have the same problem.

I guess this is just a bad IBS?
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      04-11-2012, 12:54 AM   #5
TheTal0n
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in on this, but how do you go about replacing a IBS if needed
?
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      04-11-2012, 04:58 AM   #6
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It is just the negative battery cable assembly. Looks easy.
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      04-11-2012, 11:35 AM   #7
Tom K.
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Also, I believe the battery should be registered if either it or the IBS is replaced in order to avoid over or under charging.

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      04-11-2012, 01:09 PM   #8
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So I had left the IBS unplugged overnight after trying to trouble shoot my starting issue and new battery installation. In the morning I had the same problem where it wouldn't start after I plugged the IBS in but then it would start when I unplugged it. Side note: I had a brake light on the dash after I installed the new battery.

I drove to work and parked it leaving the IBS connected. I go back to the car for lunch and and it started just fine with the IBS connected and there is no brake light on the dash anymore.

So was I just impatient with the new battery installation and the car needed to reset itself over a period of time with the new battery and everything hooked up? If so, I guess the root of the problem was a worn out battery. The old battery was at 12.18V fully charged. I think that's only good for a 30% - 50% charge so it makes since the IBS would keep the car from starting.

As a side note I was able to program the CAS with the amp hours of the new battery and I have not been able to get the ECU to register the battery. I hope it will work when I get home. I have another thread on this topic elsewhere on the forum.

In case anyone cares, I installed an EverStart Maxx-H6 from Walmart. $98 battery made by Johnson Controls. The amp hours is not a stated specification but I called the 800 number on the battery (before I bought it)and they told me it was a 72AH battery. It took 2 calls to get the info. The first call I was totally stone walled saying it was proprietary info and Walmart would not let them release it. The second call was a much nicer girl who asked the engineering department for me.
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