Intelligent Battery Sensor is bypassed

NICAT M. · Oct 24, 2015

Hi.
I was regularly getting IBS error during scan. Recently friend took a look and said , there is no IBS. It was just bypassed. (I dont know if this something technically possible)
My car works without any problem for 2 years. Do i need to fix it urgently ?
Regards

H F · Oct 24, 2015

Just unplugging the IBS cable from the negative cable will disable the IBS communication to the DME .
The only thing with it bypassed there will be no battery information monitoring or charging information data sent to the DME .

NICAT M. · Oct 24, 2015

Thanks sir.
You are kind and experienced enough to help with all my problems.
As soon as i understand it is not critical.

H F · Oct 24, 2015

Your welcome Sir ,, happy to help .. Read the attached pdf,s , its informative reading that will bring you up to speed understanding the functions and duties of the IBS software ....

xtremebmx1981 · Nov 24, 2022

H F said:
Your welcome Sir ,, happy to help .. Read the attached pdf,s , its informative reading that will bring you up to speed understanding the functions and duties of the IBS software ....

So my 2012 bmw x3 28ixdrive drives and starts well. But lately I have the battery discharge symbol in my dash. If I disconnect the ibs sensor will the message dissappear? And by doing so will my accessories start to work again. They won't work due to the message. Thank you, Happy thanksgiving

eugene420love · Nov 27, 2022

So I have an 04 525i when I got it it had the ibs car wouldn't start so my so-called friend change the battery terminals and got rid of the IBS terminals and now I am having problems with it charging and it not wanting to start is there any other bypass I can do that will stop it I don't know what to do my car is acting like the IBS is plugged in again and bad so does barely tries to start

pshovest · Nov 28, 2022

So you both ignored the warning that your cars have an electrical system problem and have been or are about to be left stranded.

The bottom line is your cars battery is not properly charged.
There are several possible causes.
1) Too many short trips.
2) Charging system is inadequate or has failed
3) There is a parasitic load discharging the battery when engine is not running.
4) You have accessories connected directly to the battery, defeating BMW's energy management system
5) You have a bad battery

Short term fix is to charge your battery with a 10-15 amp AGM rated charger until you can identify the cause

habbyguy · Nov 28, 2022

My fire alarm keeps going off, so I pulled the batteries. The other symptom is that my house is filling with smoke. ;-)

theroux · Nov 29, 2022

I don't know how accurate this info is but I've read on some older posts on other forums that the IBS also tells the car how charged the battery is, so it's possible you've overcharged or undercharged the battery and now it's gone bad.

Intelligent Battery Sensor is bypassed

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