View Single Post
Old 11-22-2013, 10:08 AM
ard ard is offline
Join Date: Mar 2006
Location: Sierra Foothills, California
Posts: 5,749
ard is on a distinguished road
Originally Posted by sbenne11 View Post
This may be a weird question, but does the E70 have a "sleep" mode or battery saving mode when the vehicle has not been started for a while ? I notice from time to time when I haven't started the car for 5 or more days, that it seems sluggish with the electronics when started, and twice the clock was off and the settings were set back to default...Either a sleep mode or a bad battery ?
As stated above there IS a sleep mode. There have been many reports of issues with batteries dying due to paracitic draws on the bus. The BMW has a bus off which various modules hang, in various states of readiness. After a certain time, they should all shut down. What can happen is one module can 'wake up', for no reason, and the car wakes up- all the modules draw power for a while, until they go back to sleep. Over a week or two this will pull down the battery. In fact, over years this process of the battery being discharged each night can lead to shortened battery life.
Reply With Quote

Sponsored Links