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Discussion Starter · #1 ·
Hi all, I am having the malfunction issue as stated on a previous forum chat. But where is the second battery in the above model? Is it in the boot/trunk?
 

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The Auxiliary Battery is not a physical battery - it’s a Large Capacitor that provides energy for the Stop / Start function.

This Capacitor is located under the passenger side footwell - there’s a excellent thread on the Forum by Toobad that explains how to change this component.

I was seeing the same Warning message and someone suggested checking Fuse 448 - in the floor of the boot.

After simply removing and reinserting the same fuse 448 - the Warning stopped for me and has not appeared since - amazing and definitely worth trying

Good luck
 

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This is the thread

 

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Discussion Starter · #4 ·
The Auxiliary Battery is not a physical battery - it’s a Large Capacitor that provides energy for the Stop / Start function.

This Capacitor is located under the passenger side footwell - there’s a excellent thread on the Forum by Toobad that explains how to change this component.

I was seeing the same Warning message and someone suggested checking Fuse 448 - in the floor of the boot.

After simply removing and reinserting the same fuse 448 - the Warning stopped for me and has not appeared since - amazing and definitely worth trying

Good luck
The Auxiliary Battery is not a physical battery - it’s a Large Capacitor that provides energy for the Stop / Start function.

This Capacitor is located under the passenger side footwell - there’s a excellent thread on the Forum by Toobad that explains how to change this component.

I was seeing the same Warning message and someone suggested checking Fuse 448 - in the floor of the boot.

After simply removing and reinserting the same fuse 448 - the Warning stopped for me and has not appeared since - amazing and definitely worth trying

Good luck
Thanks Tony huge help will try that
 

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Discussion Starter · #5 ·
FIXED !!!! I managed to change the voltage converter which is situated under the glove box . It took approximately 20 min and no issues.
 

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Discussion Starter · #7 ·
Hi Tony the part was from Newcastle Mercedes who are on eBay (was from the article/discussion you sent to me). The part cost £100 they vary in price you can get cheaper ones but they are around £80 - £120.

The hardest part is keeping the carpet pulled back to access the screws on the plastic that shields the voltage converter. The carpet has a thick insulation on but other than that it’s ok.
 

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Discussion Starter · #8 ·
Oh and the tools are a 10mm Spanner /socket set. A star/hex screwdriver for the plastic roof under the glove box.
 
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