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Auxillary battery malfunction alarm


Ranchu

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Hi S-class owners,

 

Any one know what is this Auxillary Battery Malfunction alarm is all about?

 

This alarm message only appears once in a while. Is it because of poor connection that this auxillary battery is not charged? Or is it because it is time to change this auxillary battery?

 

Appreciate your advice.

 

Best regards.

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Hi Guys,

 

Just to share this experience.

 

Went down to BCC today to check out this "Auxillary battery malfunction" alarm.

 

Found out that this auxillary battery is located underneath the steering wheel compartment. It is a 12 volts battery about the size of a handphone. Mine is a S350L W221 made in 2009.

 

After changing, the alarm went off. However, need to drive a few days see if this alarm appear again before can conclude problem solved.

 

Have driven my ride for more than a week. No more "Auxillary battery malfunction" alarm. So confirmed problem solved.

 

Regards.

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