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New member. The dreaded "Auxiliary Battery Malfunction" just showed up on my 2017 GLC43. I did a Google search and there doesn't seem to be any information on the actual location of the auxiliary battery for my car. I did see that Mercedes has put it in a large number of hiding spots, from front to back, on other models. Can anyone help?
 

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Hi and welcome to the forum. I changed my auxilliary battery after it malfunctioned and detailed the process in the link below. Bear in mind I have a 2016 UK diesel-engined RHD car but there could still be relaive location similarities even if the interior is a mirror image.

Auxilliary Battery Malfunction
 
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