According to the diagrams, there is a separate loop on the upper right hand side of the rear window specifically for the key remote. If that loop was damaged for some reason I'd think reception would suffer.

The diversity antennas/amplifiers operate to choose and integrate two signals from two separate antennas into one signal, and indeed, the back window has two separate FM antennas that run down the R and L side of the window. Whether the antenna diversity amplifier is also involved in boosting the key signal I suppose is a separate question - it sounds like you went through this so I defer.

 

first time post great forum.I have lost am/fm reception completely for last 3 weeks was changing stations when it happened looking at the forum its looking like the antenna diversity but my question is would it not effect the locking if it was gone everyhting else is working perfectely but radio reception any answers thanks ps i was wondering also if you have to programme a new antenna dirversity

 

first time post great forum.I have lost am/fm reception completely for last 3 weeks was changing stations when it happened looking at the forum its looking like the antenna diversity but my question is would it not effect the locking if it was gone everyhting else is working perfectely but radio reception any answers thanks ps i was wondering also if you have to programme a new antenna dirversity

 

I had the same problem.
I had an old key and a new key and I knew the batteries were good so people suggested
I try the diversity antenna amplifier.
I found this great DYI http://forums.5serie..._1#entry1051687 .
I bought the antenna from Gary at BMW Newport with the 25% off for members, followed the DYI
and in about 20 minutes I could lock and unlock from 3 houses down!
Good luck!

 

thanks dean could you lock and unlock the car from far away and yet no radio reception at all dont want to buy diversity if not the problem they are expensive as you know thanks again

 

My radio reception was affected and did improve but the big issue was remote distance.
I could barley get my car to respond to the remotes.
I can't say that your problem is the same since your remote is working.

 

my remote range sucks too. i have to be right next to the car. if i do put the remote againstmy throat it seems to give me afew extra feet. my fm radio reception sucks as wekk. i guess they go hand in hand

 

Replace your diversity antenna. You'll be so happy and wish you did it long ago!

 

Ditto i just had mine changed thru warranty..and the dealers will tell you all types of excuses why they can't do it. just get angry if they deny your request and usually they will do it. luckily i didn't have to get angry just...firm..lol and now i can unlock my doors damn near a block away. change the antenna!!