Hibernation mode 135i
Hope this helps someone one day.
My car sometimes goes a week without starting. Last time I did this it did not start - got nothing when I hit the button. Tried to jump it from my wife's car zip.
Rang BMW assist and waited an hour - he checked the battery 12+ volts hmmm (wish I had thought of that)
He grinned and said put the key in and wait 30 secs as the computers progressively shut down the longer you leave it.
So hope that saves someone a call to Roadside assist - just put the key in - push for ignition and leave for 30 secs and voila.
Has happened a few times now so I know it works
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