I am sorry that you have not been helped yet. I just came online.
Ok, take a look at the attached photo and see if your key looks like it with a pellet and black chip around it. If it does, make sure that the small metal pellet in the center of the black chip is not missing.
If it isnt, do the following
1-TurnON the ignition,with the engine OFF.
2-Attemptto start the engine,then release the key to ON (vehicle will not start).
3-Observe the SECURITY telltale(this is the security light), after approximately 10minutes the telltale will turn OFF.
4-Turn OFF the ignition, and wait 5 seconds .
5-Repeat steps 1through 4 two more times for a total of 3 cycles/30 minutes(the vehicle is now ready to relearn the Passlock(TM) Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK). IMPORTANT: The vehicle learns the Passlock(TM)Sensor Data Code and/or password ***** the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
6-Start the engine(the vehicle has now learned the Passlock(TM) Sensor Data Code and/or password).