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Discussion Starter #1
Hey all.
A few days ago the remote locking on my E39 suddenly stopped working. I notice also that the red alarm light is not flashing anymore when I lock the car with the key.

I've checked all the fuses, nothing amiss there. Put a new battery in the fob, little red light flashes when you press the button...still no luck.

Any ideas whats happened? :confused

Cheers, Niall
 

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You may have lost key synchronisation when the key battery went flat. There’s a procedure to follow depending in which key you’ve got. Can’t remember from the top of my head but easy to find with google


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Discussion Starter #3
The battery wasn't actually flat. I changed the battery just to eliminate that as a possibility but it didn't appear flat before had, though it does sound like that is what's happened. Just can't figure out why, it seems completely random.
I will see what info I can find and give it a try.
 

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Discussion Starter #4
Found a key re-sync guide on youtube...it worked, only took 30 seconds to do :) Remote locking and alarm now working correctly. Still not sure what triggered it though..
 
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