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5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

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Old 10-14-2009, 06:58 PM   #1 (permalink)
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Master Key Battery Question

Okay, so I know that the later model E39s with the diamond keys had batteries that recharged when in the ignition, I find no evidence of this on the '97. So the thing that is happening is when I tried to lock it with the button on the key when I went for dinner tonight, nothing happened. So I locked it by putting the key in the door, and it worked fine. I then proceeded to unlock it with the button on the key and pop the trunk with the button on the key successfully. Please tell me for some reason a low battery would cause this, because I like not having to put the key in the door every time I lock it, and I am not willing to spend money on a new key at this point if it will lock in some manner.

I wish I could find my second master key, but it got lost in the move from my old house to the one my parents live in now.
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Old 10-16-2009, 04:06 AM   #2 (permalink)
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could be low batteries in the remote. try replacing them and if it still doesnt work try an initialization. procedure can be found at DTBMW Tips page
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Old 10-16-2009, 06:26 AM   #3 (permalink)
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Thanks. Problem resolved itself mid-day yesterday, hopefully it stays that way.
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Old 10-16-2009, 07:01 AM   #4 (permalink)
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could be low batteries in the remote. try replacing them and if it still doesnt work try an initialization. procedure can be found at DTBMW Tips page
I'd like to know how to replace the battery in the diamond key.
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Old 10-20-2009, 01:31 AM   #5 (permalink)
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Its technically not intended to be replaceable however I have seen a few write-ups online from people who have cut their key open and then soldered in a new battery then glued the key back together.
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Old 10-20-2009, 06:46 AM   #6 (permalink)
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DT, that's a mighty fine e39 you got there.
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