BMW E91 318i - key fob problems

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I've had an issue with my key fob for my car for over a year now. I've just been too tight to get it sorted. I cannot remotely lock or unluck my car with any of the buttons on my key fob, or even my spare key fob for that matter. I am having to unluck the car the old fashioned way with the actual key which is hidden insde the key fob. This sets the alarm off everytime I get into the car. Once I put the key fob into the ignition, the alarm is disabled.

When I first got the issue over a year ago a took it to Sytner BMW and I asked them for a new key. They said the chances are if both keys are not working then its more than likely the reciever unit or some harness in the car that is at fault. Putting up the maintenance bill to closer to a grand. I basically said stuff that I'll live with it for now.

Now I'm getting sick of this problem, and although I've now got a bit of spare cash I'm still not paying over the odds Sytner prices. I took the car to an auto electrics garage local to me which I know have a fair reputation. He checked if the keys were sending out a signal by using a reciever box, and said, the keys are your problem, they are not sending out a signal. He recommended local car locksmith which can repair or replace keys.

Went to the locksmith, told them the problem, and they check the keys with the reciever box, and it worked! My main key worked anyway, the spare key was dead, but according to his reciever box my car key was sending out a signal. He showed me it working and compared it with other keys to confirm.

Back to the auto electrics garage, he tried the keys again on his unit and once again they did not work. He even showed me and did it with several other keys to show that his receiver box was working. He can't really diagnose any fault with the car as its the key that doesn't appear to be working. He then recommended I went to Sytner to ask them to do a quick check on the keys to see if they are sending a signal.

You know what Sytner are like, nothing is quick, or cheap. I asked them to check the keys but I have to book in as they are full for at least another week. Its a full diagnosis which is £90, and the chances are they will come up with the most expensive option, which is replace the reciever unit/harness at the cost of a grand. If it was this I would rather get it done by a cheaper garage.

Does anyone have any ideas what this could be? Or an easier way to find out if it is the keys, or the car? This should be a simple fix, but a difference of opinions is making it difficult.
 
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Take a look online you can reprogram the key too the car unless bm tryed that had same promblem on my m3
Also if you have two keys keep alternating them or the batteries will go dead as charged by car
 
Been doing a lot of googling and it seems all the sites I'm finding are how to program a brand new blank key yourself, by holding the keyfob down in the ingnition slot for 20seconds. I will give it a try though with this one. The spare key is completely dead by the sound of it but I'm more concerned about getting the primary key working, or the car receiver working.
Thats the problem, I dont know whether the issue lies with the car or the key.
 
Try googling Diversity Antenna, I’ve read about problems with water ingress or damage due to its location in the tailgate.
 
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I already checked the diversity antenna. Everything online pointed to that being the problem but when I checked mine it looked good as new, no signs of water damage or anything.

I think its going to have to be a trip to different garage to see what they come up with. Thanks anyway for your help.
 
Good luck with it, certainly sounds like it’s a trip to the stealers unfortunately.
Are they the keys that recharge in the car when driven?
 
Thought I'd update this for other peoples info.

Took the car to another auto electrical specialist. He said the key was fine, so I booked it in for diagnosis.

On the E91 you can open just the rear window for quicker access without actually opening the entire boot lid, there are cables on each side which lead to the Diversity Antenna, one of those cables was damaged. Quick and easy fix which is fairly common apparently. So he only charged me 1.5hrs labour which was £81.

18months of me putting something off because I thought it would be too expensive turned out to be as simple and cheap as that. I'm a huppy bunny now though. The joy I now get from just pressing that button on my key keyfob is unreal!

Thanks for the help and advice everyone.
 
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