Originally Posted by DICKBEE7631
It's my understanding that when you order a replacement key from the factory, they program the RFID chip via your VIN. I suspect there may be a small number of RFID codes; you just have to have the right one with your key.
With the correct code, your car accepts the key; without it, it will not. The programming you do with your car for a new fob does not affect nor relate to the RFID, but merely enables the car to respond to the lock/unlock commands from the fob.
At least that is my understanding. This still means any fob but one pre-programmed to your VIN will not work nor is programmable by you to work.
I have to agree with this explanation....it seems that all those members that have been able to program their keys by themselves had their keys ordered from the dealer and their RFID is the correct VIN code thus they can program their keys to lock and unlock. But those of us who bought used fobs can't do anything with it becauese the RFID does not have our VIN code. I have installed the correct cut key (metal part) to a used fob and it would turn the ignition on but the engine will not start. At the same time the car will not accept the fob for the lock/unlock function.
I'm still waiting for someone to find the workaround this issue if it can be done. So for the new guys in this forum take heed.....don't buy a used fob.