Battery warning lighted and asked to see User Manual

[Seven_SG]

Hi bro’s 

found out the Battery Warning lighted up and asked me to start engine when I start the car this morning. check user manual. I followed and it doesnt pop out any more. I am concern could there be issue with the battery. Any brother have this issue before for W205? Appreciate of you can share your experience. 

 

Thanks a million!

[darksaint]

Think I recall one bro mention is his auxiliary battery was failing and need to replace. U may want to visit ur workshop to do a diagnostic test on it.

https://mbworld.org/forums/c-class-w205/633845-auxiliary-battery-malfunction.html

[Seven_SG]

Thanks a million Darksaint bro. I will get it check asap and share.

[Angchug]

There is no auxiliary battery for W205. It's actually a DC converter unit which need replacement around the 3rd years. It's located below the front left compartment. You cannot DIY because need resetting with thd diagnostic PC after changing.  

[gonegolf]

I had this issue on and off and problem stopped when I disconnected some accessories and switched off some functions (Bluetooth).   It always happens when I forget to forgot to disconnect my iPod.  

Also started externally charging battery once a while, the problem completely disappeared.

maybe the stock battery not strong enough?

[Jv-c200]

Just need to start the engine for the battery to recharge. This happened to me when I the accessories were on for a long time.

[Martell888]

I have this issue after 12 months.... I went back to C&C twice. They finally replace the Voltage Converter Module, located under the passenger leg room mat(under warranty). 

First models were shipped with a voltage converter with part no. A2054400073. Such a model has been replaced by a new part no. A2059052809.

 

I believe it is a design fault.

[darksaint]

3 hours ago, Martell888 said:

I have this issue after 12 months.... I went back to C&C twice. They finally replace the Voltage Converter Module, located under the passenger leg room mat(under warranty). 

First models were shipped with a voltage converter with part no. A2054400073. Such a model has been replaced by a new part no. A2059052809.

 

I believe it is a design fault.

Gd info. Thank you for sharing. 

[Benzw205]

On 12/31/2017 at 4:18 PM, Angchug said:

There is no auxiliary battery for W205. It's actually a DC converter unit which need replacement around the 3rd years. It's located below the front left compartment. You cannot DIY because need resetting with thd diagnostic PC after changing.  

 

Hello, do we get a message when it should be replaced ? Thanks.