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(Noob) Auxiliary Battery Info

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Old Oct 3, 2020 | 10:27 AM
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E-Class W212 E350
(Noob) Auxiliary Battery Info
Hi guys! I just got my 2010 Japanese W212 E350 a week ago and this is my first Mercedes ever, the car shows aux battery malfunction and Id like to know what purpose the aux battery serves? Ive read online that its for powering accessories and Start-Stop function, I can start-stop my car currently (I assume this is the start-stop button?) , and as far as I know all accessories seem to work fine? Unless there are specific accessories powered by aux battery I dont know of yet. Am I getting the error code accidentally? I am not sure what to do next and if my aux battery REALLY needs to be replaced. I would appreciate any help!
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Old Oct 4, 2020 | 06:55 AM
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E-Class W212 E350
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Update: Cannot find Aux battery or any related cables, have checked trunk near spare tire and opened the panel on the left of the drivers dashboard. Main battery is in the front
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Old Oct 4, 2020 | 07:49 AM
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