My girlfriend has got a car (Suzuki SX Cross4) with a modern key -which is allmost (mechanically ) broken. The dealer said that the new one is bout 180 to 200 Dollars
I'd like to build device which would be able to copy key fob. What would be the easiest/best approach?
idea: can we take a Arduino Uno here. I'd like to avoid buying programmed key and teaching car the new key. That would be way too complicated and exepnsive
background: most modern cars have a seperate short range RFID transponder in the keyfob, recognised by an interrogation coil round the ignition switch.
that said: STARTING the car will often require a transponder in the key. Typically, for using a remote staerter, we would
take the transponder from one of the spare keys and
glue it near the ignition switch.
that eliminates the anti-theft feature of having a transponder key but it does allow remote starting.
how to start - do you have any ideas?
Thank you very much for any help!
New key casings are available, including for the flip keys. You just remove the PCB and transponder - and the key itself - from the old one once you prise it apart, and mount in the new. Reassembling the "flip" is fun!
Apparently there is a protocol for "cloning" the transponder from a valid key to an additional chip.
It's not easy to build something small and it's not easy to make a transmitter.
Some locksmiths may be able to do it and it might be a little cheaper, but probably not that much cheaper.
background: most modern cars have a seperate short range RFID transponder in the keyfob,
If the key & fob are separate, that's probably built-into the key itself.
When I lost my Honda key, the dealer said there was a limited number of times the key/fob could be replaced. He also said that I had to bring-in the car. After I thought about it, I'm guessing that every fob is unique and the receiver in the car has to be re-programmed.
It's not easy to build something small and it's not easy to make a transmitter.
Some locksmiths may be able to do it and it might be a little cheaper, but probably not that much cheaper.
If the key & fob are separate, that's probably built-into the key itself.
When I lost my Honda key, the dealer said there was a limited number of times the key/fob could be replaced. He also said that I had to bring-in the car. After I thought about it, I'm guessing that every fob is unique and the receiver in the car has to be re-programmed.
No, the car does not have to be reprogrammed. The car alarm system is designed to be able to accept and remember a new key fob. I had to do that with my Dodge truck when the key-fob died. There is a procedure for the car in question, you just need to find it if the dealer won't help.
Both are correct. The car does need to be brought in because the receiver does need to be re-programmed.
Even finding the receiver nowadays would be a bit of a challenge in itself, so they no longer have a "learn" button in the receiver. Instead, re-programming is performed using a specific procedure which requires having the valid key (with its chip) placed in the ignition and a series of manoeuvres on the car controls. You need to prove you have specific "possession" of the key and car.
The car key thing is all over the place with ritualistic and superstitious behaviors. Tap this three times and jiggle that for two seconds, then eat a sacrificial 10 piece bucket of extra crispy... type stuff. From what I've seen researching the subject it seems the dealers have software that connects to the ECU thru the diagnostic port. The key itself is not programmed, but the ECU is programmed to accept the key code of the key that is in the ignition, with maybe a max of three. Apparently you can buy after market rfid keys for the specific car, have a key maker duplicate the surface of the key, then find a dealer or other person who has up to date software to go into the ECU to have the code produced by the key accepted. So far I've been lucky not to have lost a key.
