E53 Electrical Gremlins

[andrewwynn]

You confused me saying the central locking not working that means the button on the console doesn’t work.

What you meant to say is the remote fob no longer acts on the central locking.

This almost always is from a bad solder joint in the key. When mine (both) went bad, reflowing the solder joints on the key brought them both back to life.

Second key? The problem is if you started key paring and not successful, you may have disconnected any alternate key.

Often it’s a secondary button not working that prevents pairing since you must press two at once.

You said you replaced battery (not likely the issue). Power is not getting to the right places. If you can open the key again re-flow the solder joints on all the chips. I’d skip the ID chip for the starter since that works if you can start. Do one key at a time to make sure you didn’t break the RFID function.

When I refurbished my keys they worked ok for over a year then failed again. When they failed, symptom was they worked from less and less distance from the car so if you ever noticed needing to get closer than 100’ to unlock that’s the reality check it’s key solder joints.

My favorite fix in the 6 years i had e53 was getting a factory key. My 30-50' range went to 300' immediately. Expensive yes. Made me smile every time i used it. (I even kept the key wen insurance wrote off the car).


–awr–

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