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In the mean time(if you haven't already) have a good look to see if there is anything within reach disconnected. I just had a quick look on mine (3.0L) and the only exposed BRN/GRN wire I could see was for the washer fluid level so good chance this might be a ground for something and maybe there is a second wire or this is pulled out of an existing connector.
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1988 325is (purchased new) sold
2004 X5 3.0 2005 X3 2.5
2008 X5 3.0 (new to me)
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