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E90/E91/E92/E93 (2006 - 2013)
The E9X is the 4th evolution of the BMW 3 series including a highly tuned twin turbo 335i variant pushing out 300hp and 300 ft. lbs. of torque. BMW continues to show that it sets the bar for true driving performance! -- View the E9X Wiki

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  #1  
Old 10-08-2012, 08:15 PM
BBMW528i BBMW528i is offline
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Remote Key

So I have searched through the forum and there is no real answer to this...

I am one of the idiots that lost a key. Actually my whole set of keys... house, mailbox, work, car, etc. I have my spare so I am fine for the moment, but I'm disappointed with myself to say the least.

Anyways, I have another 3-series key a friend gave to me and I want to see if I can get it programmed to my car. A couple people have said no you can't do it because the dealership says no.

My question is, if they are able to disable a key that you lost, aren't they able to disable the key I have and enable it to my car? The answer has to be yes, but I am almost positive they won't do it because why would they do that when they can make more money from me buying one from them? That is the only explanation. Has anyone ever been able to get an old used key programmed to their car?

BTW I don't have CA.
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Old 10-08-2012, 09:13 PM
Orient330iNYC's Avatar
Orient330iNYC Orient330iNYC is online now
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IIRC,
the keys need to be programmed to the car. yes, the key (as well as programming the car)
the key is writeable once-- you would need to replace the chip in the key ( im not sure if the chip is epoxied to the board, which would not surprise me, replacing it would be beyond the ability of even a skilled SMT solderer)
the key needs to have the crypto key from the car written to it in order to respond-- its a two way communication.

when you order a key from bmw, it is preprogrammed for your car. i dont believe the dealership can even program the keys. the car is then programmed for the key.

you can possibly get the remote functions working with a used key, but you wont be able to get the car to start as the key cant be updated to talk to the car.
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Last edited by Orient330iNYC; 10-08-2012 at 09:24 PM.
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Old 10-08-2012, 09:32 PM
BBMW528i BBMW528i is offline
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Makes sense, but then how is a key "disabled" once you program a new one from BMW? Change the programming of the car?
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Old 10-08-2012, 09:40 PM
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Orient330iNYC Orient330iNYC is online now
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Quote:
Originally Posted by BBMW528i View Post
Makes sense, but then how is a key "disabled" once you program a new one from BMW? Change the programming of the car?
yes.

you disable the "lost key" in the cas module.
its two way-- if your new key isnt programmed for the car, it wont work
if the car isnt programmed for the new key, it wont work.
if you disable a lost key in the cas module, even though it was programmed to the car, the car will no longer recognize it as valid.

the metal key is a bit more of a pain, that requires the trunk, drivers door, and glovebox lock cylinders to be replaced.
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