electical e90 pdf
http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU
There are about 5 power wires leading forward (from the battery)to various points in the cabin and engine bay(see first pdf) . The one that the recall is on powers the cabin electronics and is terminated behind the fuse box in the cabin.
Sometimes you can bring the car back to life by shaking the cable behind the fuse panel in the cabin. There is a large range of cars between 07 and onward that are effected and just because your car is not on the list it doesn't mean that that
cannot be the problem. Also your IBS may be messing with you but genraly you will have cabin power when that happens. These cars are not easy to jump a simple jump may not work if the battery is really low or shorted internally.
The average lifetime of a battery in these is 6 years.
http://www.usatoday.com/story/money/...ables/1924627/
see entry 48 also