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      04-21-2012, 04:14 PM   #13
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Drives: 2011 E90 M3, Jerez Black
Join Date: Dec 2011
Location: SF Bay

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Originally Posted by schnell325 View Post
Yes, that's my understanding. I'm not 100% sure what exactly occurs when you lock the vehicle, but it is recommended by BMW to help reduce issues with the batteries.

Perhaps some electrical components "sleep", for lack of an engineering explaination......
I've been taking my son to Sylvan for a couple of hours every Saturday, and I sit in my M3 while reviewing for my boards. I've noticed that without the car locked it will almost regularly cycle electronics, the displays light back up briefly (showing the "P" mode, etc.).

It doesn't seem like a LOT of activity, but I'd estimate that SOMETHING happens at least every 10-15 minutes while the engine is off. Locking the doors does seem to stop most of these electrical gremlins. I'm not entirely certain why either, but there may be some sort of low power/sleep mode for all of these functions when the doors are locked.