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Old 08-18-2017, 11:44 AM   #1
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Default Rechargeable key FOB doesn't work

Hi

I'm in pretty desperate situation. Story goes like this.

I bought a e61 2005 in really good condition the only problem I have is that remote control doesn't work. I have already start / stop button in the car and the key has a rechargeable battery.

- remote control doesn't work
- I have to unlock the car manually with a plastic key or the metal piece which is inside of remote
- when insert the key fob inside to start the car I receive a note that I need to recharge my battery
- if I press start the car starts normally
- no car settings are saved on remote (eg: radio is always off when you start the car...)

After reading and reading online about it, it seems pretty common thing. So I start checking things one by one:

1) I bought a new remote from BMW and still doesn't work
2) I've pull apart one remote and measure the voltage of the battery it was 3.14v. I was pressing the buttons for a while utill the voltage dropped under 2.9v. Then I put the key together and drive around. When I measured again the battery was back to 3.14v. So I guess the battery is recharging.
3) I've opened the back spoiler and check for any water damages in the control unit. There were no signes of water or any other damage. To be sure that thats not a problem I've drove to some guy from ebay who had a working unit at home so I could test. Still didn't work.
4) then I pull apart all the cables that go from the back spoiler and passing the back roof speakers. All cables are ok. No damage whatsoever.

This is where my knowledge and ideas ended.

I've asked at bmw what to do and if they can help me out and how much would it cost. They say that they need to try couple of things. No straight answer. But between the lines he said it will be around 1200-2000E.

Does anyone had an idea what else could i try?

I've read so many posts already but none of them had the same problem. I guess one reason is that this setup with rechargeable battery on e61 and Start stop button wasn't produced for long time. Most of them have or the old diamond key with mechanical key or the new ones with removable battery.

Thank you in advance
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Old 08-18-2017, 06:27 PM   #2
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Each key has a profile number. It sounds like your key is not in a master position. Also, do you know if your car has comfort access?
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Old 08-18-2017, 09:58 PM   #3
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I don't have a comfort access. As far as I know this 1st models of e61 had no comfort access. Correct me if I'm wrong.

Not sure im understanding you correctly, what do you mean by not in the master position?

Thank you for your help
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Old 08-19-2017, 06:32 AM   #4
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Each CAS is only good upto 10 keys so each key is assigned a number and profile position. profiles 1 and 2 being the master positions. If you have DIS try to go in disable all other keys and move your current key to profiles 1 or 2.
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Old 08-19-2017, 11:49 PM   #5
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Ok. Good to know. I'm having Ncs expert v4.1 but for some reason doesn't fully work as it should. I'll do a fresh install today on windows XP and try and see what the key programing options are. But I'm having a bit of doubts as I got 2 original keys from previous owner and he didn't mention nothing loosing so many keys that at least one of them wouldn't be on Master position.

Anyway. I'll have a and make some photos.

Tnx for helping, really appreciate it
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Old 08-20-2017, 02:37 AM   #6
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Hi is it the square key u have
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Old 08-20-2017, 03:50 AM   #7
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Yes. With rechargeable battery.

Here's a photo I found online
http://thumbs1.ebaystatic.com/d/l225...UE6fUsJqFQ.jpg
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Old 08-20-2017, 08:35 AM   #8
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Got Ncs expert running.

Here's a print screen of what I see:

http:// goo.gl/6L777R

Looks like there are 4 keys registered. I have 3 of them and none of them is working.
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Old 08-20-2017, 10:45 AM   #9
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I'm having a bit of doubts that this could be a problem.

Why would I receive a note that I need to charge my key although my I've tested and the key is getting charged. Same also happens with brand new BMW key.

If the key wouldn't be in a master position this shouldn't come up. I understand that car settings wouldn't be saved. But remote unlock and key charging should work.
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Old 08-21-2017, 06:53 AM   #10
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Have u an electric toothbrush if so with just the tooth brush charger lay key on it for few hours that will boost the charge
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