Henk: The info on my site is a bit confusing I found just, it is also the LKM-L and not only LKM-B. See the headline in the DIY article: Resolder and fix the infamous mustard relay (for LKM-L).
There was always a confusion more than 10 years ago when and how, here is the answer I hope:
http://www.7-forum.com/forum/5/senfr...rin-17866.html
The technical info at that time we had was only available for 735 and 750, not for 740.
Apparently on the newer LKM of the 740 this function is integrated into the LKM.