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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Interesting discovery: No CA, but car senses when fob is close!



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      04-06-2006, 01:59 PM   #1
skimo
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Interesting discovery: No CA, but car senses when fob is close!

For people without CA, try this.

Get in your car and place your fob close to the fob slot..."beep" and a key sign appears. Move it far, key sign goes off...bring it close again..."beep" ... (is this using RFID technology?)

Now, could I use this "feature" to make my own type of CA? basically keep a dummy key in there all the time. Something just big enough to push on the side buttons of the slot. Then all i have to do is bring my real key close to the dash and push start!!

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      04-06-2006, 02:05 PM   #2
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Well if you are going to have to put your real key/fob close to the dash you'd just negated any benefit you intended to gain in the first place....I don't suppose that is the whole purpose of CA, its for you to access the car without taking out the key.
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      04-06-2006, 02:05 PM   #3
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i have noticed that too...but if you are going to bring your normal key close you might as well stick it in the slot....
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      04-06-2006, 02:08 PM   #4
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Ya, you shouldn't tease it, put it in.
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      04-06-2006, 02:31 PM   #5
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Quote:
Originally Posted by timzerofive
Ya, you shouldn't tease it, put it in.
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      04-06-2006, 02:59 PM   #6
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If you notice carefully, I think you'll find this occurs only when your FOB is very close to touching the FOB Slot, like in a position to go in the FOB Slot. This happens to me too but I guess you're not gonna wanna keep holding the FOB in one hand while driving with the other (if you don't want to put it in the slot). The reason it beeps is to remind you that your key is still in the car while your door is open.
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      04-06-2006, 03:08 PM   #7
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      04-06-2006, 03:22 PM   #8
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Quote:
Originally Posted by timzerofive
Ya, you shouldn't tease it, put it in.
Maybe she likes to be teased
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      04-06-2006, 11:51 PM   #9
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Try putting just the tip in.
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      04-06-2006, 11:55 PM   #10
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Is CA even offerred on the 325? I did not see it as option when I bought mine...at least thats how it is in Canada..I think and I got zsp and zpp
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      04-07-2006, 12:03 AM   #11
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In the US, people can get Comfort Access with their 325i. Lucky them.
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      04-07-2006, 12:15 AM   #12
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It is available as a special order on the 325, my salesman says 400CAD charge for the special order + 750CAD CA price = 1150CAD on a 325.

Quote:
Originally Posted by 325er
Is CA even offerred on the 325? I did not see it as option when I bought mine...at least thats how it is in Canada..I think and I got zsp and zpp
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      04-07-2006, 12:17 AM   #13
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Quote:
Originally Posted by timzerofive
Ya, you shouldn't tease it, put it in.



Imagine the car going "is it in yet???"
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      04-07-2006, 12:56 AM   #14
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Quote:
Originally Posted by tctic
In the US, people can get Comfort Access with their 325i. Lucky them.
lazy people huh? j/k
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      04-07-2006, 03:31 AM   #15
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Quote:
Originally Posted by cosmosblau
Try putting just the tip in.


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      04-07-2006, 03:43 AM   #16
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All modern cars have this. But the transponders needs to be very close to each other. Ive tried this on a FIAT Ducato. Ive put just the key in (without the black key-thingy, the key was broken). And then when putting the black key 'holder' close to the key slot the cars code unit unlocks.

Its not RFID
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      04-07-2006, 07:46 AM   #17
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Quote:
Originally Posted by rightnow
All modern cars have this. But the transponders needs to be very close to each other. Ive tried this on a FIAT Ducato. Ive put just the key in (without the black key-thingy, the key was broken). And then when putting the black key 'holder' close to the key slot the cars code unit unlocks.

Its not RFID
Actually it is RFID... Anything that uses radio signals to send a indentification string to a receiver is considered RFID. In this case the RFID tag in the key is active (since it has a battery). Look on the back of the key and there is a frequency and FCC number for it (at least there is of mine which I have CA, but the older key from my E46 also had this information).

Also many tags work only at the distance of inches and some even require physical contact with the reader...
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      04-07-2006, 10:28 AM   #18
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Quote:
Originally Posted by espo89
Actually it is RFID... Anything that uses radio signals to send a indentification string to a receiver is considered RFID. In this case the RFID tag in the key is active (since it has a battery). Look on the back of the key and there is a frequency and FCC number for it (at least there is of mine which I have CA, but the older key from my E46 also had this information).
I don't see how the RFID tag (which it most definitely is) can be using the battery - it would be "on" all the time. An "active" tag merely means that it can be written to (which this one can as info is stored in the fob), not that it's battery-operated. The FCC info is there for the normal remote transmitter, which is a separate beast.

There's no reason the fob shouldn't work forever w/o battery replacement, at least the RFID portion of it. Hitting a button to unlock the "old-fashioned way" is another story.
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      04-07-2006, 05:05 PM   #19
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What she said

This would be much funnier if I had Photoshop...
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      04-07-2006, 05:26 PM   #20
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Quote:
Originally Posted by canucklion
It is available as a special order on the 325, my salesman says 400CAD charge for the special order + 750CAD CA price = 1150CAD on a 325.

I special ordered CA on my 325i which is coming in May. $1150 was a hard pill to swallow but from what I hear, it will be worth it down the road.
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      04-07-2006, 06:28 PM   #21
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Right, it is RFID and the fob itself has a battery so it can also send your door lock/unlock signals to the car. Note that the spare/emergency key is just a small bit of plastic... If you place your emergency key (not in it's holder fob) by the slot you'll get the same display and dinging.
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      04-07-2006, 06:32 PM   #22
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Quote:
Originally Posted by KevinC
I don't see how the RFID tag (which it most definitely is) can be using the battery - it would be "on" all the time. An "active" tag merely means that it can be written to (which this one can as info is stored in the fob), not that it's battery-operated. The FCC info is there for the normal remote transmitter, which is a separate beast.

There's no reason the fob shouldn't work forever w/o battery replacement, at least the RFID portion of it. Hitting a button to unlock the "old-fashioned way" is another story.
Both "active" and "passive" tags can be written to. An "active" tag has it's own power supply, a "passive" tag gets it's power from being "excited" by the receivers radio signal. "Active" tags are on all of the time, but use very little power. They, however, are not really transmitting a signal unless a receiver asks for it kind of like your computer in hibernate mode and then you hit the resume button.

Talking with our RFID export at work his best guess it that the FOB is a combination of a tranmitter and "passive" RFID tag. The transmitter to open the doors, and the RFID tag to send the "unlock" signal to the car once it is excited by the receiver in the dash..
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