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older BMWs (iBus models) wind down after the key is taken out the car, for about 16 minutes - various modules stop and go to sleep within that time frame at different points of time, and the last one standing sentry is the alarm module if so equipped...
So, maybe the same principle still applies to the newer models?...
PS. i did notice though, that if the interior light is left on, it goes to sleep after couple of hours after the last activity... So, LCM must be staying up longer...
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