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2007 E350 Battery control module? Second battery?

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Old Oct 15, 2021 | 07:05 PM
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2013 C250 - Given to daughter. Now a 1982 240D
2007 E350 Battery control module? Second battery?
My 2007 regular E350 (not 4matic) has been having battery drain issues (dead by the end of the week). I have pulled all the fuses for seat controllers, audio, etc. but still drains. I tried to locate the battery control module but everything I google shows it by the battery in the trunk. Not there on mine. Can someone point to where it is on the later W211's? And mine does not have the aux battery which I assume is also a model year change. Thanks in advance

VIN WDBUF56X87B
Last edited by mildenbenz; Oct 21, 2021 at 09:02 PM.
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Old Oct 15, 2021 | 07:08 PM
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2008 E350, 2012 ML350, 2014 E350, 2015 ML350
Please post your VIN number
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Old Oct 15, 2021 | 07:30 PM
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Originally Posted by juanmor40
Please post your VIN number
Edited original post.
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Old Oct 16, 2021 | 04:46 PM
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Best if you have someone with Xentry (MB diagnostics) track rest current, see attachments.

Attached Files
File Type: pdf
Check.pdf (555.2 KB, 226 views)
File Type: pdf
211-battery-removal.pdf (230.3 KB, 180 views)
File Type: pdf
install front prefuse box.pdf (614.9 KB, 154 views)
File Type: pdf
Front SAM.pdf (45.4 KB, 169 views)
File Type: pdf
Front SAM 2.pdf (23.8 KB, 190 views)
File Type: pdf
Interior.pdf (33.0 KB, 165 views)
File Type: pdf
Rear SAM.pdf (31.8 KB, 181 views)
File Type: pdf
Rear SAM relay.pdf (19.6 KB, 212 views)
File Type: pdf
Front prefuse box.pdf (24.9 KB, 171 views)
File Type: pdf
Rear prefuse box.pdf (31.7 KB, 268 views)
File Type: pdf
WDBUF56X87B088939.pdf (67.2 KB, 161 views)
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Old Oct 16, 2021 | 10:03 PM
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So no aux battery and no Battery Control Module, just the battery sensor?
Last edited by mildenbenz; Oct 16, 2021 at 10:07 PM.
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Old Oct 17, 2021 | 11:26 AM
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Yes, aux battery, BCM, and aux battery relay gone as of 2007.

After about 10 minutes rest current should fall < 60 mA if > 60 mA and < 1.2A via front pre-fuse box (F32) and rear (F33) narrow down the rest current path to localize the culprit, final rest current should must be < 60 mA.
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Old Oct 17, 2021 | 01:15 PM
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Originally Posted by konigstiger
Yes, aux battery, BCM, and aux battery relay gone as of 2007. After about 10 minutes rest current should fall < 60 mA if > 60 mA and < 1.2A via front pre-fuse box (F32) and rear (F33) narrow down the rest current path to localize the culprit, final rest current should must be < 60 mA.
Thank you konigstiger. As always you are a wealth of knowledge. An earlier current draw test was at 71 mA when in sleep mode. You have given me a path to follow.
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Old Nov 23, 2021 | 09:26 PM
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Originally Posted by konigstiger
Best if you have someone with Xentry (MB diagnostics) track rest current, see attachments.


Do you happen to have dimensions of the battery in trunk, which one of the following would be a good fit ?

https://www.beaurepaires.com.au/batt...mf-car-battery
https://www.beaurepaires.com.au/batt...eu-car-battery
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Old Nov 24, 2021 | 02:30 AM
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Originally Posted by gagan takker
Do you happen to have dimensions of the battery in trunk, which one of the following would be a good fit ?

https://www.beaurepaires.com.au/batt...mf-car-battery
https://www.beaurepaires.com.au/batt...eu-car-battery
Well in the US, the battery in the trunk is an H8 and if you look at the dimensions for the H8, it says it's 354mm in length so I'd go with the first one. I guess the second is probably the equivalent of an H6 which is smaller.

https://pepboys.com/champion-agm-bat...roduct/2071679

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