Note:

Entering programming mode erases all remotes that were programmed. You must reprogram all remotes you want to work once you have entered the programming mode.
You must perform each of the first twelve steps within 5 seconds of each other to enter programming mode. Programming each remote (step 8) must be done within 10 seconds.

Make sure the doors are unlocked
Turn the ignition to the ON position (II)
Press the LOCK or UNLOCK button on the remote
Turn the ignition to the ACCESSORY (I) or LOCK (0)
Turn the ignition to ON (II)
Repeat Steps 3,4,5 two times
Press the LOCK or UNLOCK button on the same remote. Make sure the door locks cycle to indicate that the system has entered programming mode programming completed
Press the LOCK button on each remote that you want programmed. Make sure the doors locks cycle each time to indicate that remote has been accepted. The system will accept up to three remotes repeat procedure starting from the beginning
Turn the ignition to LOCK (0) to exit the programming remote, Test Remotes

Note:

Make sure all the doors are CLOSED and UNLOCKED before starting this programming procedure.
You must reprogram all of the keyless remotes once you are in the programming mode. You must complete each step within 5 seconds of the previous step to keep the system from exiting the programming mode.

Make sure the doors are unlocked
Turn the ignition to the ON position (II)
Press the LOCK or UNLOCK button on the remote
Turn the ignition to the ACCESSORY (I) or LOCK (0)
Turn the ignition to ON (II)
Repeat Steps 3,4,5 two times
Press the LOCK or UNLOCK button on the same remote. Make sure the door locks cycle to indicate that the system has entered programming mode programming completed
Press the LOCK or UNLOCK button on each remote you want to program. Make sure door locks cycle after you push each remote button to confirm system has accepted the remote
Turn the ignition to LOCK (0) to exit the programming remote, Test Remotes