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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > Europe (Continental) > E91 Key Fob Not Working



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      01-19-2025, 11:09 AM   #1
AlxMac
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E91 Key Fob Not Working

Hi folks,

Been picking my hair out with this one. Hoping someone can shed some light.

My E91 key fob is no longer working to lock/unlock/boot lock. The fob is not comfort access so doesn’t have a replaceable battery and unfortunately I don't have a spare to test.

I used BimmerLink to scan and the following code was found.
ABEB: OxABEB: Error in the connection diversity to the antennas

I began by checking all central locking fuses and all are good.
Then proceeded with checking voltages on the diversity antenna under the spoiler.
Wire 1: 12v
Wire 2: 5v
Wire 3:0.5v??
Wire 4: 0.3v but reads 12v when the car is ‘woken up’

I believe wire 3 needs to read 5v so I went and bought a used replacement diversity antenna from eBay and fitted it today and no luck with the key fob and all the voltages were reading the same as previous.

Does anyone know where wire 3 voltage goes to and does anyone have a diagram for this?
Am I right in thinking wire 3 is 5v from the board therefore it shows that the board is faulty? That’s what I thought but the recent replacement proved different.

Anything else I can check on this??

Thanks in advance
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      01-29-2025, 04:04 PM   #2
armanos
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What year is your car? Check the ground connections for the antenna, sometimes they do get corroded.
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