Mercedes-Benz W205 Auxiliary Battery Replacement DIY (Mercedes-Benz C300, S63 AMG, C63 AMG, & More)

Mercedes-Benz W205 Auxiliary Battery Replacement DIY (Mercedes-Benz C300, S63 AMG, C63 AMG, & More)

►One of the most common searches on the Mercedes W205 is related to the Mercedes-Benz auxiliary battery.

If you own a Mercedes-Benz W205 with electronic gear selectors or the eco start-stop function, your vehicle has something called a voltage converter, commonly referred to as the auxiliary battery. If you notice an auxiliary battery error message on the dash telling you to shift the vehicle into park but leave the engine running, or if you have the auxiliary battery malfunction message, there’s a good chance that this is the part that needs replacing.

If you have to replace your Mercedes-Benz main battery at any point, it is wise to replace this auxiliary battery at the same time along with it. This is a very straightforward job that does not require the use of any special tools. Kyle Bascombe, FCP Euro’s Mercedes-Benz Catalog Manager, covers taking out the old battery, assessing the failure point, swapping in the new one, as well as inspecting other potential failure points if your auxiliary battery has burned up.

Shop the parts used in this video:
Voltage Converter: https://www.fcpeuro.com/products/mercedes-voltage-converter-hella-205905341480?utm_source=youtube&utm_medium=description&utm_campaign=mps%20w205&utm_content=battery%20diy

Index:
00:00 – 02:00 Intro & Tools Needed
02:00 – 05:30 Carpet, Trim & Kick Panel Removal
05:30 – 06:45 Auxiliary Battery Inspection & Removal
06:45 – 07:20 New Auxiliary Battery Install
07:20 – 12:15 Kick Panel, Trim & Carpet Reinstall
12:15 – 14:30 Fuse Inspection
14:30 – 15:03 Thanks For Watching!

#fcpeuro #W205 #Mercedes

This video applies to the following vehicles:
Mercedes-Benz S63 AMG
2015 Mercedes-Benz S63 AMG Base 5.5L V8
2016 Mercedes-Benz S63 AMG Base 5.5L V8
2017 Mercedes-Benz S63 AMG Base 5.5L V8
2018 Mercedes-Benz S63 AMG 4Matic 4.0L V8

Mercedes-Benz S65 AMG
2015 Mercedes-Benz S65 AMG Base 6.0L V12
2016 Mercedes-Benz S65 AMG Base 6.0L V12
2017 Mercedes-Benz S65 AMG Base 6.0L V12
2018 Mercedes-Benz S65 AMG Base 6.0L V12

Mercedes-Benz C400
2015 Mercedes-Benz C400 4Matic 3.0L V6

Mercedes-Benz C300
2015 Mercedes-Benz C300 4Matic 2.0L L4
2015 Mercedes-Benz C300 Base 2.0L L4
2016 Mercedes-Benz C300 Base 2.0L L4
2016 Mercedes-Benz C300 4Matic 2.0L L4
2017 Mercedes-Benz C300 4Matic 2.0L L4
2017 Mercedes-Benz C300 Base 2.0L L4
2018 Mercedes-Benz C300 Base 2.0L L4
2018 Mercedes-Benz C300 4Matic 2.0L L4

Mercedes-Benz GLC300
2016 Mercedes-Benz GLC300 4Matic 2.0L L4
2016 Mercedes-Benz GLC300 Base 2.0L L4
2017 Mercedes-Benz GLC300 4Matic 2.0L L4
2017 Mercedes-Benz GLC300 Base 2.0L L4
2018 Mercedes-Benz GLC300 Base 2.0L L4
2018 Mercedes-Benz GLC300 4Matic 2.0L L4

Mercedes-Benz C63 AMG
2016 Mercedes-Benz C63 AMG Base 4.0L V8
2017 Mercedes-Benz C63 AMG Base 4.0L V8
2018 Mercedes-Benz C63 AMG Base 4.0L V8

Mercedes-Benz C63 AMG S
2016 Mercedes-Benz C63 AMG S Base 4.0L V8
2015 Mercedes-Benz C63 AMG S Base 4.0L V8
2017 Mercedes-Benz C63 AMG S Base 4.0L V8
2018 Mercedes-Benz C63 AMG S Base 4.0L V8

Mercedes-Benz C450 AMG
2016 Mercedes-Benz C450 AMG 4Matic 3.0L V6

Mercedes-Benz GLC43 AMG
2017 Mercedes-Benz GLC43 AMG 4Matic 3.0L V6
2018 Mercedes-Benz GLC43 AMG 4Matic 3.0L V6

Mercedes-Benz E300
2017 Mercedes-Benz E300 4Matic 2.0L L4
2017 Mercedes-Benz E300 Base 2.0L L4
2018 Mercedes-Benz E300 Base 2.0L L4
2018 Mercedes-Benz E300 4Matic 2.0L L4

Mercedes-Benz C43 AMG
2017 Mercedes-Benz C43 AMG Base 3.0L V6
2018 Mercedes-Benz C43 AMG Base 3.0L V6

Mercedes-Benz S550
2017 Mercedes-Benz S550 4Matic 4.6L V8
2017 Mercedes-Benz S550 Base 4.6L V8

Mercedes-Benz E43 AMG
2017 Mercedes-Benz E43 AMG 4Matic 3.0L V6
2018 Mercedes-Benz E43 AMG 4Matic 3.0L V6

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Comments

Suzy 600 says:

Awesome! Good clear instructions well explained. I have a UK GLC 250D (2016) same location and part, plastic a bit fiddly to refit but saved £££ on both the part and fitting so well worth it. Many thanks.

Mazen Kanso says:

Thanks for the video, the error disappeared once I changed the Voltage Converter Module, but on the screen the ECO light does not show up anymore and it does not start/stop even though the switch for ECO in the center console is on and lit green. Does it need some kind of hard reset. Thanks again

Joel Sweat says:

Excellent video! Great job explaining everything very knowledgeable!

Ben Zhu says:

Did this to my dad 2015 c300 when it hit 50k miles. It comes out of nowhere and you get an auxiliary battery warning. Was not hard to do prob took me an hour and that was from looking at schematics of where it was placed. Would recommend you to disconnect the main battery when working with stuff like this.

Fatboylousa says:

Thank you very much, I was able to replace it on my E300 without incident thanks to your explanation. No more annoying Aux Batt Maulfuction message… Thanks!!!

Garth Goldberg says:

This fellow Kyle seems to know a lot. Was he a Mercedes dealer tech?

Laura Smith says:

This was really helpful, easy to follow, and saved me a lot of $. Thanks!

Mel Green says:

Great video, really well informed and easy to understand you. I did the replacement in a GLC and it was almost identical. Small problem was the insulation foam cracked quite a bit. Thank you!!!

T Stemen says:

I enjoy the videos done by FCP. Spoke with the owner once. Really nice guy.

kung siong says:

if only VW provide you a fuse map also. so sad

Parth Dinubhai says:

Nothing against Mercedes but, can you guys do a BMW F30 transfer case diy?

PaulieFein says:

Funny, I was thinking that you're always doing BMW repair videos, and that we need more Benz videos. But I just realized that Benz don't break like beemers, lol

Gary VanRemortel says:

Super concise format, well presented. No crappy music to detract from the content. IMO you guys are the Gold Standard for YouTube repair videos.

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