Mercedes B class AMG line diesel auto

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Johnexs
Newbie
Posts: 1
Joined: Tue May 14, 2019 3:01 pm

Mercedes B class AMG line diesel auto

Post by Johnexs »

Hi
Anyone tell me what the small auxiliary battery is for located in the footwell, is it anything to do the eco stop/ start system.

landroverman1958
OneWave
OneWave
Posts: 43
Joined: Thu Dec 04, 2014 7:53 pm

Re: Mercedes B class AMG line diesel auto

Post by landroverman1958 »

As far as i am aware its a back up battery for various keep alive memories,eg transmision it is usually listed on the scan tool as the auxilary battery,which has a switch over relay to keep it charged,it also is a back up for the electronic brake system.
I may be wrong about its function but i,m sure someone will correct me if so.

Sharpy
TwoWaves
TwoWaves
Posts: 55
Joined: Sun Dec 23, 2018 9:59 am

Re: Mercedes B class AMG line diesel auto

Post by Sharpy »

I know for sure on much bigger mercs the additional batteries are for a RPS redundant power supply which is a back up for the electric power steering in case the main power supply goes down whilst driving.

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