E-Class (W211) 2003-2009

Quick Battery Question.

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Old Jan 2, 2013 | 04:26 AM
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AMGAffalterbach's Avatar
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2014 BMW M235i
Quick Battery Question.

Just a simple question. If one of the two batteries is dead (main v. aux) will the car still be able to start? Thanks.
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Old Jan 2, 2013 | 05:16 AM
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Harrys500's Avatar
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W211 E500 -03
If the main is dead the car propably is dead too, in other words it will not start.
If the aux is dead You would have difficulties using convenience equipment i believe. To that You'll have a lot of different alarms ringin during power up and driving...

..............**Thanks**.
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Old Jan 2, 2013 | 04:31 PM
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ARe you sure you even have an aux battery? I thought that ended in 2006.
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Old Jan 2, 2013 | 07:42 PM
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AMGAffalterbach's Avatar
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Whoops I think you're correct, upon further reading the Aux battery was no longer needed as the SBC system was also eliminated with the W211 facelift. Even on the pre-facelift, the Aux battery is on a separate relay that cannot power the starter motor and may not even be powerful enough to.
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Old Jan 2, 2013 | 08:04 PM
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Originally Posted by AMGAffalterbach
Whoops I think you're correct, upon further reading the Aux battery was no longer needed as the SBC system was also eliminated with the W211 facelift. Even on the pre-facelift, the Aux battery is on a separate relay that cannot power the starter motor and may not even be powerful enough to.
My wife's car is a 2006 E350. I have a 2007 E350. Both are facelift cars. Hers has an aux battery, mine does not.
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Old Jan 2, 2013 | 08:17 PM
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Yeah I've confirmed that Model Year 07 was when they discontinued the Aux battery no need for it. Thanks.
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