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Old 01-08-2012, 07:47 PM
Mindage0230 Mindage0230 is offline
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Battery died in remote key.. will alarm sound if manually opened?

Hello - I just went out to my car and my remote to unlock the car isn't working (assuming the battery died). If I manually unlock the car will the alarm sound? If so, will is stop once I've put the key in and started the car?
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Old 01-08-2012, 09:34 PM
noego noego is online now
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there is no alarm unless you installed one yourself. so, go ahead and use your problem.
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Old 01-08-2012, 09:34 PM
Supercourse Supercourse is offline
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I don't think I have enough info. to go on, but I will say no, just unlock the door with the key.

Do you really have the (rare) factory alarm? Even if you do, it wouldn't see using a key in the door as an unauthorized act.

If you have an aftermarket alarm - same thing I would hope, unless it was badly installed.

Else what would be the point of the supplied plastic valet key?

Was this a sudden failure?
As the battery is of the rechargeable type, I would think you would have some intermittent operation before it quit completely.

Does your other remote key work?

If not, you are looking at a receiver/antenna problem rather than a key failure.
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Old 01-10-2012, 09:07 AM
UncleJ UncleJ is offline
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+1! Remember the battery in the key is recharged when you drive the car (and its in the ignition of course), so you might want to switch your keys from time to time to keep them both charged up. BTW, that battery is replaceable but it is not a job for the timid. Cost is about $2.00 for the appropriate radio shack battery and a bit of soldering. The biggest problem is opening the case and then epoxying it closed again. There was a DIY on this a couple of years ago with pix but I don't see it now in the search. Good luck!
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Old 02-24-2013, 03:41 PM
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bluebee bluebee is offline
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This, from the E39 bestlinks, can also help others, so I post it here for reference:
- How to replace the old-style BMW square key battery (1) (2) & how to replace the rubber key pads in the square keys (1) (2) & what the red LED indicates on the old square key (1) & what can go wrong with a key and where to send it for repair (1) (2) (3) (4) & what battery to use in the new style 2000+ BMW E39, E46, E53, E85, etc. diamond key (1) (2) (3) (4) (5) (6) (7) & youtube videos of diamond key repairs (1) (2) (3) & a square key to diamond key retrofit and transponder swap (1) (2) (3) (4) & diamond key to square key retrofit questions (1) & how to recharge your key out of your BMW and how long that key will last in the drawer before it needs that off-the-car recharging (1) & the details on swapping the BMW diamond key transponder (1) & the proper diamond key initializing or programming sequence (1) (2) (3) (4) (5) (6) & what to do if your only key is locked inside your bimmer (1) & a description of the various types of BMW Remote, Illuminated, Spare/Wallet, & Valet/Service keys (1) (2) & a list of diamond key EWS, FZV, & DWA functions (1) (2) & all about the 10-key limit to programming your own keys at home (1) & a description of the ignition key ISN (individual serial number) ten-second rule (1) & what to do if you lost your only diamond key (1) or what to do if your BMW key was stolen (1)

Please read the suggested threads and add value, either by pictures or by descriptions, so the next person stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need

Last edited by bluebee; 02-26-2013 at 08:27 AM.
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