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Discussion Starter #1
Trying to find location for backup battery relay on my MB W221 , 2009 .
Does anybody know ?
On W211 it can be between wiber arms . Can it be same location on W221?
Regards
 

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I am not familiar with a relay for that battery. Are you looking for this?

Fuse 38 is a 5-ampere fuse, for the additional auxiliary battery G1/7, EZS control unit N73, and Front SAM control unit.
 

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Discussion Starter #3
I am not familiar with a relay for that battery. Are you looking for this?

Fuse 38 is a 5-ampere fuse, for the additional auxiliary battery G1/7, EZS control unit N73, and Front SAM control unit.
Thanx for answer , There is a small backup battery in the dash , I think 1,4Ah.
On E-class about same year the relay is , https://www.youcanic.com/wiki/mercedes-benz-k572-auxiliary-battery-relay-replacement.
And I think it can be same place on my car , but I am not sure.
Regards
Magnus
 
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