[jmhammerle]

What is the battery connector under the backseat of my 2005 525i? I know the battery is in the truck. This is a capped off connector on the passenger side

 

[Jay Arras]

Have a pic?

 

[NoQuarter]

I think it is just the "shipping" mode connector. Not sure how it is used but it was from when the car was new/in transit and is of no use to you (it is not an accessory or anything)