GM Service Manual Online
For 1990-2009 cars only

Important: 

   • Additional Master Theft Deterrent Controller Keys (Black) may be added (up to 10 keys) using this procedure when there is an available learned Master Theft Deterrent Controller Key (Black).
   • This procedure adds keys only, it does not erase previously learned keys.
   • The keys to be learned must duplicate the mechanical cut of the current key.

  1. With a previously learned Master Theft Deterrent Controller Key (Black), turn ON the ignition, with the engine OFF.
  2. Turn OFF the ignition and remove the key.
  3. Within 10 seconds insert the key to be learned (Black) turn ON the ignition, with the engine OFF. The vehicle has now learned the new key(s).