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eltax91

Impact of leaving the IBS disconnected

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Hi guys

Had an issue with a high battery drain warning recently, google seeming to suggest that the IBs sensor was kaput. I dropped it off to a specialist who scanned it for me and unplugged the IBS to confirm this was the fault. It's now been running for a few days without issue! The specialist suggested I just leave it unplugged, but quoted me £200 to replace if I wanted. The new part, by all accounts is uprated to stop the water ingress killing it again.

So, my question is, whats the ramifications of leaving it unplugged? Whats it's original purpose?

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it charges it intelligently, increasing voltage just after startup and decreasing as time goes one, cutting the supply to certain things if the battery is low, charges it more if it's winter etc.

 

helps conserve battery if its low, and increases battery life.

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Well, my driving normally is as follows:-

 

Drive 3 miles (B roads) to M1

Drive 100+ miles

Drive 3 miles to an office (A roads)

 

Reverse to go home. So, I do a LOT of motorway work at 70-75. Presumably the IBS isn't really having to divert alternator power with this kind of driving, as theres plenty being kicked out and not much load on the electrics with a stationary car? I'm keen to understand EXACTLY what the IBS does before i decide not to replace.

 

As for a new battery being cheaper, the specialist wants £200 for the IBS, there is an invoice for a recent new battery in my cars' history at £295.....

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Ever since owning the car i have had ibs errors, but for 8 months there were no symptoms until christmas day . I was going out that day and the battery was completely flat (no lights on dash at all)

I disconnected the ibs and charged the battery and it held its charge. I went to the dealer in canterbury and they quoted £185 for a new ibs, the one on my car has been discontinued and the new one comes in 3 bits. What a pain doing this over christmas.

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If you replace the battery yourself you have to get the new battery coded/registered is what they told me... But if you just leave the IBS disconnected do you still need to do this??

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I don't think you do, I took mine to get coded, but when I told the guy I was going to disconnect the IBS, he said there was no point. I would check this out with someone here who knows for sure as I'm not 100%

Hope this helps

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Ive just had this issue on a recently purchased  2005 E60 535d Touring and it is in the process of  being  sorted out. I had  water ingress through the  rear  brake  light clusters on both sides over the last few  days and some found its  way way onto the battery and  IBS. This  resulted in a  big drain, no  warnings and 2  flat batteries over the weekend  just gone. In the  ensuing investigation we  determined that the  recently  purchased battery installed by the vendor  had not been  programmed and there was possible  water damage to the  IBS. The battert  was programmed to the  car  and  it  was s found that the  alternator  readings  were   fluctuating pointing at the IBS  being defectiive too so I am  waiting for that part  to be  supplied  and installed. Thankfully this was  cought e arly enough  for the ingress not to get under the  wheel  well into the relays there and the vendor is covering all the  work and costs....

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I'm also looking at a new IBS potentially. Not sure yet as looking at the battery health first. It appears that it's an improved IBS now...anyone have a part number on an invoice perhaps ?

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hi there,

 the part numbers are as follows:

   M12.51.7.615.476     Ibs adaptor    £22.00

   M12.42.7.603.567     Lead              £117.50

   B61.12.9.123.572     Tubing            £14.81

         The prices are from the end of 2012 so may be different now and I think the vat on them  came to over £30 , the parts were not a stock item and required a day or two to come in. 

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hi guys, thanks to everybody to share their findings, after being a victim of the IBS sensor that drained my battery (and killed it doing this) I decided to leave the IBS disconnected. I don't want to take the chance of replacing it, and then suddenly it starts flipping again and draining my battery while I am in the middle of nowhere. No point in that, so no more IBS for me :-)

 

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I've been without the IBS for almost a year now and I'm glad to say I have not missed it at all. I have added the IBS to my banned list which has runflats, swirl flap and the DPF on it :lol:

 

Don't forget to add the EGR :lol:

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I've been without the IBS for almost a year now and I'm glad to say I have not missed it at all. I have added the IBS to my banned list which has runflats, swirl flap and the DPF on it :lol:

 

Hi.  Have just been to BMW for the annual service of my 2005 535d E61 , and apparently have a logged IBS and Power Management fault.....plus another £1,800 of work.....  Re the IBS, is the general consensus to leave it unplugged?   Also, swirl flaps, just removed those the other day - what an unbelievable design fault, may as well have round the hose off with a plug!!  Cheers.

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