I taped into the ashtray light for dvd player on my X3 and had no issues, you can tap into the remote wire on nav unit or your stereo unit but it is more work

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X5 4,4i-06 Current
330Ci Cab-03 2007-2008
MB E55 AMG-03 2006-2007
Z3 2,8 Roadster-98 2006-2007
X3 2,0d-05 2005-2006
320d-99 1999-2005