I lost my keys

does,or did your key have the pellet on it?if so it is the PassKeyII system.With PassKey the pellet in the key is read by the ignition cylinder and a similar process ensues from there. PassKey requires the use of a special key, PassLock does not. PassKey I was called "VATS", PassKey II is similar and uses a resistor pellet in the key and is slightly more secure than VATS.There's no programming required if you know the resistance. However if you don't know the resistance value you'll need to get a new key with a new resistance and have the dealership or locksmith tell the computer to accept the new value.