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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > BSD interface fault



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      12-24-2015, 02:12 PM   #1
jakeycrx
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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, 11:09 PM   #2
IanS100
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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, 05:59 AM   #3
jakeycrx
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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!
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