The last resort is to try a new amplifier. If that works, then it was the amplifier problem. Otherwise, it was the rear window problem. Make sense ?

to be honest i never thought about about the remote distance, having said that it works really now even through glass and walls so......

That makes sense. Earlier, it sounded as if you were ruling out the window if both FM and key reception was weak...

Thanks for the guide! I used it when I replaced my diversity antenna today.

Here are some tips and reference pictures to help the replacement go more smoothly:
1) Fold down the split seat and remove the head rest. Then sit on top of it facing forward like a passenger and lean backwards so that you can get your head under the back window to see the clips.
2) There is a roof liner clip and should be pulled down to gain more access to the amplifier.
3) Grip the back edge of the amplifier, and push against the front clips to release it easier.
4) When re-installing, get back clips in first, then press up from the bottom to get the front clips to lock in.
5) The most bottom C pillar clip didn't want to clip in for me. Frustrated, I elbowed it gently and it clipped in :twoup:

https://farm6.static.flickr.com/5082...13f82210_z.jpg
https://farm5.static.flickr.com/4152...949db55b_z.jpg
https://farm6.static.flickr.com/5129...c36db329_z.jpg
https://farm5.static.flickr.com/4104...066e4285_z.jpg

Nice DIY guys... I might also order from Gary. My FM reception is going high and low latly...
Thanks GUys..

In total, this will be the second time that my diversity amplifier has been changed. 1st time was under warranty, and 2nd time is today.

The part numbers:
Factory install diversity amplifier: 65 20 6 931 719
Revision 1 diversity amplifier part no: 65 20 6 988 057
Revision 2 diversity amplifier part no: 69 20 9 193 836

BMW must have known that the diversity amplifier was defective... why else would they revise the diversity amplifier twice :think:

I used the latest revision of this amplifier.

GREAT POST!!! Only took me 10 minutes to replace mine with these instructions. It really helped to know which way to push and pull on things. Seems to have made a BIG improvement with my FM reception.

THANKS!

In addition to the DIY link posted above, if you want more info, you look at the links in the following post:
https://5series.net/forums/topic/105...st__p__1262159

Been a busy day today, managed to get the brake fluid done and also installed the latest revision of the diversity amplifier to resolve the progressively worse key reception distance.

Thanks for the guide, it took less then 10 minutes, knowing which way to push the amplifier and clips definitely helped https://5series.net/forums/public/st...ault/twoup.gif