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On 11/5/2016 at 2:04 PM, angusc said:

 

Hi,

I just replaced the main battery under the seat and while looking through the hand book found pictures of a battery in the trunk. When u removed the Bose unit there it was. I will replace it anyway as it is from 2006 so probably the original unit. But can anyone let me know the functionality of the two batteries, is there any user interaction required to switch from one to the other, which is the "main" battery?

Thank you in advance.

Sent from my SM-G935F using Tapatalk

I thought you either had the bose or the second battery not both?  I' have bose and have assumed I dont have the other battery.  My car is a 2009 GTS.  Anyone confirm before I rip the bose out?

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Mine has the Bose and the auxiliary battery under the sub woofer. It's easy to check and only takes a fee minutes to remover the two bolts holding in the Bose sub woofer to see under it.

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