Auxiliary battery

[rossman-abz]

Hi Merc gods.
the aux battery in my 2016 CLs shooting brake is faulty. Can anyone tell me where it’s located in my car
TIA

 

[whitenemesis]

How do you know it's faulty?

 

[Jkh112]

It is located under the load area floor in my 2014 E class estate. Lift the boot floor flap and it is visible.
Not sure if the CLS is the same.

 

[alexanderfoti]

If its got Code B03 then its in the boot under the floor, as Jkh112, if its got code 4U7 then its on the end of the dashboard on the drivers side, behind the panel.

 

[rossman-abz]

How do you know it's faulty?

 

[rossman-abz]

Auxiliary battery malfunction came up on dashboard

 

[rossman-abz]

purchase new auxiliary battery from Merc dealership, was only £82. Changed it and all
Good.
it was under floor to boot. Thanks for the help guys