Mercedes B class AMG line diesel auto

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Johnexs
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Joined: Tue May 14, 2019 3:01 pm

Mercedes B class AMG line diesel auto

Post by Johnexs » Tue May 14, 2019 3:06 pm

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
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Re: Mercedes B class AMG line diesel auto

Post by landroverman1958 » Fri May 17, 2019 6:18 pm

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
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Re: Mercedes B class AMG line diesel auto

Post by Sharpy » Sun May 19, 2019 9:27 am

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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