This is a picture of the antenna diversity on a F10,,,,the antenna diversity is sitting just behind the third brake light,,,,on some other cars it sit inside the rear trunk area or on the rear trunk inside lid,,,,the customer was complaining about both key remotes won’t lock or unlock the car,,,,and the car will not Identify the key remote,,,,the only way to start the car was to hold the key remote up to the side of the steering column,,,,during the test I first tried new key remote battery,,,that didn’t work to easy,,,,tried BMW test plan and they said both key remotes were bad,,,,will I thought what are the chances both key remotes are bad at the same time,,,,not likely,,,,while holding the key remote up to the steering column the keys would identify the VIN number of the car,,,,,so I knew the key remotes were good and the CAS was ok,,,I had a antenna issue,,,I checked the interior antenna which is behind the ashtray,,,,,that was ok,,,,I finally tried a new antenna diversity which controls all the smaller antennas and sends the signal to the CAS and the JBE units,,,,good new no programming or encoding for this unit,,,,,just plug and play.
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bmwtechnician 
Thanks for the hint where the diversity antenna (I always thought, it was more an antenna amplifier, correct?) is located. I´m quite sure it´s responsible for my issues regarding my not working key remotes.
But how did you check the “ashtray antenna”?
And do I have to to remove the batterie before installing the new diversity antenna?
Thanks for you reply in advance
Olaf
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No you don’t have to replace the battery when replacing the diversity antenna
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Sorry for my missleading question and thanks for the quick replies. I´m from Germany and English is not my mother tongue… I meant, if I had to disconnect the battery, but I just had a call with my car mechanic, he told me it´s not necessary to do that.
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That’s ok my German isn’t very good anymore
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I usually plug in a new antenna and see if that fixes my problem,,,,you could swap a different antenna with the ashtray one and see if that fixes your problem.
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Hello ,
I am having the same issue ,tried replacing the diversity antenna ,tried replacing the inner antenna in central console to no avail …could you please guide me in the right direction ? There is no fault code in CAS …my car is bmw f10 525D 2011
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Question,,,do you have the same problem with both key remotes,,,also can you start the car by holding the key remote to the steering column,,,,,you could have a bad key remote,,,,,we need to know if the CAS see the car VIN when trying to start it.
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I’m having the same issue when it is really hot outside. Both keys won’t unlock or start the car. It’s possible only by placing the key to the steering wheel column.
Changed car battery and key batteries with new ones, no luck.
When it’s cold outside keys work perfect.
What should I check?
Thanks
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There really isn’t anything you can check,,,,it needs to be attached to a diagnostic equipment and scanned for faults and checked signals
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thanks for your response
ITSA doesn’t show any error related to the keys or antena signals, I’ve already tried that..
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Question you said it only happens when it’s hot outside also was any work or a accident with the car on the drivers side,,,because there is a antenna in the lower rocker panel and one in the center consul area,,,,,also will the rear trunk unlock when this happens if it doesn’t stand next to the rear trunk and try it again because you will be closer to the antenna,,,also try from the passengers side to unlock the car,,,because the car has a lot of antennas and 1 main antenna diversity,,,I want to find out which one is not working.
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Hi, my issue didn’t get resolved yet, as I’m unable to reproduce it right now (the weather is still cold here). But as I remember, I tried unlocking the car from multiple sides and it didn’t work. The car has not been damaged as far as I know — remote controls stop working only when the car sits in the sun while temperatures are above 30 degrees or more.
On the diagnostics side with ITSA, from where can I check the signals of antennas? (if it’s possible though)
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Hi, I have exactly the same problem as iqatest. When the car is in the sun and it is hot, the remote control will not open. Both keys do not unlock or start the car. This is only possible by inserting the key in the steering column. ITSA does not report any error related to antenna keys or signals. Thanks for you reply in advance
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The control does not work on either side.
When it cools down or the car is not in direct sunlight, the remote control works.
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Hi,,,I never found out what fixed Iqatest car,,,,I would think your problem would be the antenna diversity because it sits in the roof and gets hot from the sun.
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