Cease initiation of auxiliary battery due to error.

[DolSquirrel]

Greetings, everyone.

I own a 2017 C220 Executive Estate.

Despite doing extensive web research for many days, I have been unable to locate definitive evidence pertaining to my specific need. Consequently, I have decided to seek assistance on this platform.

Previously, I received a notification indicating "Auxiliary Battery Failure" on the dashboard. Additionally, the Green A symbol has changed from green to yellow and remains yellow for around 99% of the time. Occasionally, it briefly turns green and functions properly for a few instances of starting and stopping the vehicle. However, it then passes several days without functioning before working again. I cover a monthly distance of 2000 to 4000 miles when driving. The vehicle has accumulated a mileage of 113,000 km. All other functions operate correctly except for the halt Start function.

Based on my investigation, the most probable cause is the Auxiliary Battery. However, I am unable to locate the specific location on my vehicle, the accurate part number, and if it is a component that can be replaced by myself.

Assistance is highly valued.

Gratitude is extended to you.

[MutanX]

There is a label with a QR code on the B post of the vehicle, namely on the north/south side. Utilise your phone to scan it, and it will provide the precise whereabouts of the batteries inside the car.

[Captiva]

The item is located in the footwell on the side of the vehicle where the passenger sits. Carpet removal is necessary but feasible.

[DolSquirrel]

Appreciation expressed. I am presented with three instances of laughing out loud

 

[DolSquirrel]

[Bitxx]

This is a prevalent issue. The component in question is not a battery, but rather a capacitor/power module situated in the passenger footwell.

Below are some links that you may find interesting:

Genuine Mercedes-Benz W205 C-Class Voltage Converter Aux Battery A205905341480 | eBay

[DolSquirrel]

Appreciation expressed. That was my guess. Is there a location where I can verify that A205905341480 is the correct component for my vehicle?

There are several items available on platforms like eBay, some of which are authentic while others are not. Is it advisable to only purchase genuine products? I recall an instance around 15 years ago when I bought a mass airflow item and it became evident rather quickly that the counterfeit versions were of poor quality.

[DolSquirrel]

I recently spoke with my nearby Mercedes-Benz dealer who informed me that the cost is £182, but declined to verify or provide the specific component number.

[MutanX]

Mb are vexatious and refuse to provide the component number. Simply examine your present item or contact sellers on eBay such as Listers / mb. Newcastle and Edinburgh

[DolSquirrel]

I attempted to circumvent the need for disassembling it twice (due to laziness, humorously) and the temperature is low, hahaha

[DolSquirrel]

Based on the description, it seems that the Genuine Mercedes-Benz A205905341480 Voltage Converter Auxiliary Battery I bought is the exact component for my automobile, which I got on eBay.

 

[DolSquirrel]