ISTA not detecting IBS sensor

e93_connects · 11-19-2023, 09:54 PM

Hello!
2008 BMW e93
Manufactured 04/2008

I have a crank, but no start issue. Alternator was replaced a year ago. Battery was replaced 2 months ago. The battery worked well for 2 weeks. After that it needed to be jump started to work. Resting voltage is at 10.8V. When the car was being driving after jump starting it would read 13.6V. I cannot diagnosis if it is a parasitic drain due to IBS not being detected on ISTA. Would this mean I need to change the IBS sensor or the battery distribution box so I can better diagnosis the issue? Please let me know. Thanks!

ptpending · 11-20-2023, 01:37 AM

AUC sensor is not IBS sensor, this is climate control recirc sensor, which is located under hood right side near windshield, they fail over time because their heating circuit fails.
IBS sensor is not available via D-CAN diag bus, you need to charge battery sitting in car , so that IBS sensor will see correct capacity, a later find the good bmw indy electric who can search for the current leak

e93_connects · 11-21-2023, 03:26 PM

Quote:

Originally Posted by ptpending

AUC sensor is not IBS sensor, this is climate control recirc sensor, which is located under hood right side near windshield, they fail over time because their heating circuit fails.
IBS sensor is not available via D-CAN diag bus, you need to charge battery sitting in car , so that IBS sensor will see correct capacity, a later find the good bmw indy electric who can search for the current leak

Got it, thanks. Those are the codes my car is throwing. The car battery is showing full when I trickle charge it and plug in the D-CAN. Whenever I open up the door or put the car in the ON position it drains to 10V so I can’t see the battery info and it still says IBS sensor not detected. But, it can be jumped started and runs fine. I tested the alternator and it’s fine. The car does goes into sleep mode. But, whenever it’s awoken it drains the battery. I’m guessing it’s a parasitic drain?

ptpending · 11-22-2023, 02:27 AM

you need to charge battery when it is in connected to car, via charging point under hood
and also fix connection to ibs sensor on negative battery connector

11-19-2023, 09:54 PM	#1
e93_connects Registered 2 Rep 2 Posts Drives: 2008 BMW 335i e93 Join Date: Nov 2023 Location: Jacksonville,FL iTrader: (0)	ISTA not detecting IBS sensor Hello! 2008 BMW e93 Manufactured 04/2008 I have a crank, but no start issue. Alternator was replaced a year ago. Battery was replaced 2 months ago. The battery worked well for 2 weeks. After that it needed to be jump started to work. Resting voltage is at 10.8V. When the car was being driving after jump starting it would read 13.6V. I cannot diagnosis if it is a parasitic drain due to IBS not being detected on ISTA. Would this mean I need to change the IBS sensor or the battery distribution box so I can better diagnosis the issue? Please let me know. Thanks! Attached Images
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11-20-2023, 01:37 AM	#2
ptpending Colonel 464 Rep 2,773 Posts Drives: e91 Join Date: Dec 2013 Location: Poland iTrader: (1)	AUC sensor is not IBS sensor, this is climate control recirc sensor, which is located under hood right side near windshield, they fail over time because their heating circuit fails. IBS sensor is not available via D-CAN diag bus, you need to charge battery sitting in car , so that IBS sensor will see correct capacity, a later find the good bmw indy electric who can search for the current leak __________________ E81 2007 130i 6cylinder Montego blue Retrofits: Harman Kardon, High-beam assistant, Removable tow hitch. Auto-dim folding exterior mirrors. Lumbar support. Perfomance Brakes.
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11-22-2023, 02:27 AM	#4
ptpending Colonel 464 Rep 2,773 Posts Drives: e91 Join Date: Dec 2013 Location: Poland iTrader: (1)	you need to charge battery when it is in connected to car, via charging point under hood and also fix connection to ibs sensor on negative battery connector __________________ E81 2007 130i 6cylinder Montego blue Retrofits: Harman Kardon, High-beam assistant, Removable tow hitch. Auto-dim folding exterior mirrors. Lumbar support. Perfomance Brakes.
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