Originally Posted by Xrs2
You could do a proximity key with any car if you really wanted too.
You would need to bypass the cars stock chip (like a remote start does) and you would need a RFID reader, and RFID tag.
You would have to put an RFID chip in the key (RFID tag), and then a corresponding RFID switch in the car connected to a push button start. The RFID switch would be wired in just like a kill switch. When the key was not in proximity, the starter switch would not work. If you just wanted the doors to unlock you could keep the stock key combo, but a push button is just so much cooler.
You could use relays to do anything once the key is in proximity. This includes remote starts, open the windows, unlock the car, lights on/off.
However if you went the push button route, any idiot would be able to hot wire your car, because you bypassed your stock key chip. They would just have to run a hot past the RFID switch to start her up.
They make N.O. and N.C. RFID switches already, I have held them in my hands at school.