1997-1998 models Add Duplicate key 1. Insert an existing key into the ignition cylinder. 2. Turn the ignition cylinder to ON (RUN) and back to OFF. 3. Remove the existing key and, within fifteen seconds, insert the new key and turn it to ON (RUN). 4. The security light will light up for two seconds to indicate success in programming the key into the vehicle. Models 1998+ Add Duplicate Key (Requires two working Keys) 1. Insert an existing Key into the ignition cylinder. 2. Turn the ignition cylinder to ON (RUN) and back to OFF. 3. Remove the existing Key and, within five seconds, insert a second Key and turn it to ON (RUN) then back OFF. 4. Insert the new Key before ten seconds have elapsed and turn it to ON (RUN). Leave it on for one second and turn back to OFF. 5. The security light will light up for three seconds to indicate that the new Key has been successfully programmed.