I can't find my manual so I thought I would ask you guys here.

MY car has a red and green light under the rear view mirror.
Lately when I use the remote and unlock the car, I noticed that the lights came on flashing similtaneously.
Is this warning me that the main battery is going bad?
I haven't had any problems with the battery that I know of.

Thanks.

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2010 W212 E350 Sport
1996 W210 E320 (220K miles)