Didn't the Harman Kardon L7 change to 688 after 2010
at some point it did not sure when but in coincided with the
deletion of the rear tweeters.
old option was 677 new is 688 same system minus tweeters.
(These number are from the audio build sticky in the stereo sub forum)
And at some point the sdars went from being a seperate module
to a built into the head unit or idrive option. May only be US numbers.
For coding help in the UK
http://www.e90post.com/forums/showthread.php?t=704363
http://www.e90post.com/forums/attach...2&d=1266451970
The above document verify s 677 as the old option number for L7