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  #1  
Old 11-29-2013, 11:12 PM
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Question Keyless unlock doesn't work.

At first I thought maybe the key fob needed a battery, but I heard they don't have a battery, but instead have a capacitor, so the problem is elsewhere. Any clues?

Not a huge deal, but if I can find a way to diy it, I'd love it.
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Old 11-30-2013, 12:06 AM
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are both keys not unlocking or just 1 ?there is a rechargeable battery in the key, it charges through the ignition switch.
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Old 11-30-2013, 12:11 AM
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Just one key. If it's rechargeable it's either not recharging or something else is wrong.
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Old 11-30-2013, 01:51 AM
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It can be the battery in the switch, in this case have the guy in California (GM5 repair) who is very experienced at replacement, sort his for you. I can recommend him.

The other thing is the FZV antenna module (receives and process the key signal). In my case it was the FZV module. I found a good, used module and after replacement - my remote keys work. Make sure you check your FZV module, as there are different frequencies used depending on where you are in the world.
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Old 11-30-2013, 01:54 AM
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Quote:
Originally Posted by ProfessorX5
...I heard they don't have a battery, but instead have a capacitor...
Here's some info that may help clarify some confusion...some of it was also discussed in a thread you were in the other day...perhaps you didn't go back after your last reply in that thread and missed some of this info:







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Old 11-30-2013, 09:56 AM
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Neat... so maybe it'll work once recharged (I haven't driven it much yet). If not, I'll check the FZV. BTW, I found this handy article, which might prove useful for future readers of this thread:

BMW Key Fob/Remote unlock repair

Thanks for the input, guys. Looks like I have a few projects lined up for the spring
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Old 11-30-2013, 10:46 AM
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If you have a battery charger...you can hook it up to the jump start posts in the engine bay, then insert your remote key into the ignition and turn it to POSITION 1...leave it there overnight (for up to the 30 hours needed to fully charge your key's battery).

The battery inside the key only charges when the ignition is in KL-R (position 1) or KL-15 (position 2) or KL-30 (position key returns to once engine has started)...using a battery charger hooked up to the jump start posts....prevents the car's battery from draining (which you don't want to happen with the key in the ignition...doing so has been known to kill the key).
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Old 11-30-2013, 10:56 AM
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Our X is mainly her car. My wife doesn't work and uses it mainly for short trips to cart the kids around. Recently the key fob (and what does fob mean?) started acting up. I figured it was a weak battery do to quite a bit of use with not that much charging time. Last Saturday we went matress shopping and spent the majority of the day driving around and not using the remote. That night it worked great, couple days later, back to normal. I will replace the battery first as this is what I think it is and it only cost about 5 bucks and around 30 minutes of my time.
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Old 11-30-2013, 01:01 PM
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Quote:
Originally Posted by ProfessorX5 View Post
Neat... so maybe it'll work once recharged (I haven't driven it much yet). If not, I'll check the FZV. BTW, I found this handy article, which might prove useful for future readers of this thread:

BMW Key Fob/Remote unlock repair

Thanks for the input, guys. Looks like I have a few projects lined up for the spring
I had 1 key that didn`t work so I openned it up check battery , batt was good ,the little switch for unlock button fell apart . so after that I just put that key back together and I`ll use for a spare if I ever need it to start the sav. long story short I ened up buying a key from the stealer for 220.35 including hst note you have to program all keys at the same time.
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Old 11-30-2013, 06:14 PM
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How'd you open it?
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