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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 08-08-2015, 05:58 AM   #1
dbaibo
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key fob not working

hello people, i have a 330ci 2004 and my key fob stopped working a couple of months ago iv done alot of research and believe that the problem is either from my antenna amplifier since the car isnt recieving the signal from the key, or a friend told me it might be from the ignition switch since my car keeps beeping when driver door is open whether the key is in or out of the ignition , also i do have another key the was for another car an x5 2000 model the sadly burned and the key is what remained, i tried to program this key on my car but it wont turn at all to start the programming procedure please help
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Old 08-09-2015, 01:34 AM   #2
EuroSlovakiaE46
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You are overcomplicating, sounds like the battery in your key died. The key is a sealed unit, and you can only buy another at the dealer and they will have to reprogram to the car.
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Old 08-09-2015, 12:30 PM   #3
dbaibo
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the first thing i did was change the battery and check all fuses
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Old 08-09-2015, 01:48 PM   #4
EuroSlovakiaE46
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I am talking about the battery in the key, not the car... You cannot change the battery in the key and will have to order a new one.
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Old 08-09-2015, 05:51 PM   #5
dbaibo
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so your saying that each time the battery in the key dies you have to get a new key?.

i changed the battery in the key it looks like the watch batteries uv done it before many times in my old car and besides the car is not responding to anyother key i took it to a specialist and he tried a couple of keys he agreed that the problem was that the car was not recieving the signal from the key, the key is fine
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Old 08-11-2015, 03:01 PM   #6
Delineation
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try fuse 67.
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Old 10-07-2015, 02:15 PM   #7
EJ713
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The key battery is recharged when in the ignition cylinder. If the battery were to die then a new key is needed. I have heard of others buying new batteries off eBay. Make sure to following the exact programming procedure found in the Bentley service manual. It's unlikely the antenna module is faulty, but it is also an electronic component so I wouldn't rule it out completely.
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Old 10-07-2015, 03:05 PM   #8
dbaibo
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Thank you I actually tried changing the ugnition switch sensor but it didnt work so I think its either the antenna amplifier or I need a new key
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Old 06-11-2016, 08:39 PM   #9
Delineation
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Quote:
Originally Posted by EJ713 View Post
The key battery is recharged when in the ignition cylinder. If the battery were to die then a new key is needed. I have heard of others buying new batteries off eBay. Make sure to following the exact programming procedure found in the Bentley service manual. It's unlikely the antenna module is faulty, but it is also an electronic component so I wouldn't rule it out completely.

Never heard that a dead batter from not being recharged would end the complete functionality of the remote. I just put a new starter switch in hoping to give my key a charge.(& also the starter switch was getting old) So my question is: why would a dead battery stay dead and not take a charge?
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Old 06-12-2016, 04:31 PM   #10
EJ713
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Quote:
Originally Posted by Delineation View Post
Never heard that a dead batter from not being recharged would end the complete functionality of the remote. I just put a new starter switch in hoping to give my key a charge.(& also the starter switch was getting old) So my question is: why would a dead battery stay dead and not take a charge?
The key battery is soldered to a circuit board in the key head. There may be burned contacts internally which is preventing the key battery from charging or preventing the remote functions from operating. The key head can easily be opened up for further inspection.
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Old 06-13-2016, 03:16 AM   #11
ballpein
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This guy repairs and refurbs keys, seems like he knows the system inside and out. I have no personal experience, just came across the link on one of the forums... He may be able to help you troubleshoot.

https://www.bmwgm5.com/Keys.htm_nr_
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Old 06-13-2016, 12:22 PM   #12
Delineation
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Originally Posted by EJ713 View Post
The key battery is soldered to a circuit board in the key head. There may be burned contacts internally which is preventing the key battery from charging or preventing the remote functions from operating. The key head can easily be opened up for further inspection.
Okay. So simply running down the battery alone won't do it? A few years back my Fob went though the wash and weeks later stopped working. Maybe thats what happened.
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Last edited by Delineation; 06-13-2016 at 12:23 PM. Reason: spelling
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Old 06-14-2016, 02:13 PM   #13
M3 boyzky
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Quote:
Originally Posted by ballpein View Post
This guy repairs and refurbs keys, seems like he knows the system inside and out. I have no personal experience, just came across the link on one of the forums... He may be able to help you troubleshoot.



https://www.bmwgm5.com/Keys.htm_nr_

like what he ^ said, I've sent my key fobs to Scott and he did a good job. $50 per key (unopened). No issues ever since.
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Old 06-23-2016, 10:58 PM   #14
Delineation
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Ok just go mine to work. Just now. Here's what I did:

1.Key to position 1 once.

2. Held down the unlock button upon removal.

3. Pressed and held the BMW button then pressed it 3 time rapidly.

4. Let go of lock button.

5. Confirmed with BMW button.

The car doors where closed, car was unlocked and Windows where up.

I've tried every sync procedure I could find for two years. Gave it a shot in the dark. Maybe this will work for you.
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