GM Service Manual Online
For 1990-2009 cars only

Important: 

   • To initiate, this procedures requires that 2 learned keys be available.
   • A total of 10 keys may be programmed to a single vehicle.
   • This procedure adds keys only. The procedure does not erase previously learned keys.
   • The keys to be learned must duplicate the mechanical cut of the current key.

  1. With the first previously learned vehicle key, turn ON the ignition, with the engine OFF.
  2. Turn OFF the ignition and remove the key.
  3. With the second previously learned vehicle key, turn ON the ignition, with the engine OFF.
  4. Turn OFF the ignition and remove the key.
  5. Within 10 seconds insert the key to be learned. Turn ON the ignition with the engine OFF. The vehicle has learned the new key when the security indicator has turned OFF.