Master Key Battery Question

[Kai]

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.

[Dirty_Tool]

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

[Kai]

Thanks. Problem resolved itself mid-day yesterday, hopefully it stays that way.

[yaofeng]

Originally Posted by Dirty_Tool

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.

[Dirty_Tool]

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.

[Torque]

DT, that's a mighty fine e39 you got there.