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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > AUDIO/VIDEO + BLUETOOTH + Electronics/Alarm/Software > Custom Wallet Key?



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      05-19-2010, 09:26 PM   #23
wareagle900
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your post makes no sense..... Yeah, the car starts with a fob shaped something in the car.


The valet key only works when the key is in the fob holder thingy...

I would just like you to explain hoW a rfid chip can transmit a signal without power.....

It just seems illogical to me.
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      05-19-2010, 09:47 PM   #24
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ok, been reading up on it and i suppose it makes sense to use a passive rfid

but if it indeed is a passive, then why have a battery at all?
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      05-21-2010, 01:05 PM   #25
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For the lock remote.
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      12-07-2011, 07:36 PM   #26
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I'm resurrecting this thread. I wonder if the OP managed to pull this off.

I also want to switch my F10 key into a credit card key. If it is a simple matter of powering an RFID chip, I can use the old credit card key from my Lexus as a shell for the BMW RFID chip.

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