BSD interface fault

jakeycrx · 12-24-2015, 01:12 PM

I've got 2 fault codes logged on my E91 330d that I've cleared but come back. They are:

4A07: Alternator. No communication via BSD interface.
4A27: Intelligent battery sensor, communication. No communication via BSD interface.

Does anybody have any idea what could be causing these faults? My aux water pump is also faulty.

IanS100 · 12-24-2015, 10:09 PM

Have a read at this, it won't answer your question but may help you understand the problem better:

http://www.bmw-planet.com/diagrams/r...FB1362_BSD.htm

jakeycrx · 12-25-2015, 04:59 AM

Thanks. That's interesting because when I got the car it was showing the IBS fault but not the alternator fault. It was also showing an oil sensor fault.

When I removed the undertray it looked like a mouse had chewed through all 3 wires for the oil sensor. I repaired the wiring and cleared the faults. The oil sensor fault cleared but now I have this alternator fault. Maybe the mice have managed to chew through something else!

12-24-2015, 01:12 PM	#1
jakeycrx New Member 1 Rep 7 Posts Drives: E91 330d Join Date: Dec 2015 Location: Gloucestershire iTrader: (0)	BSD interface fault I've got 2 fault codes logged on my E91 330d that I've cleared but come back. They are: 4A07: Alternator. No communication via BSD interface. 4A27: Intelligent battery sensor, communication. No communication via BSD interface. Does anybody have any idea what could be causing these faults? My aux water pump is also faulty.
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12-24-2015, 10:09 PM	#2
IanS100 Major General 136 Rep 5,050 Posts Drives: 520d F10 LCI M Sport Join Date: Nov 2011 Location: Southport UK iTrader: (0)	Have a read at this, it won't answer your question but may help you understand the problem better: http://www.bmw-planet.com/diagrams/r...FB1362_BSD.htm
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12-25-2015, 04:59 AM	#3
jakeycrx New Member 1 Rep 7 Posts Drives: E91 330d Join Date: Dec 2015 Location: Gloucestershire iTrader: (0)	Thanks. That's interesting because when I got the car it was showing the IBS fault but not the alternator fault. It was also showing an oil sensor fault. When I removed the undertray it looked like a mouse had chewed through all 3 wires for the oil sensor. I repaired the wiring and cleared the faults. The oil sensor fault cleared but now I have this alternator fault. Maybe the mice have managed to chew through something else!
	Appreciate 0 Quote