Hello! I am sorry the other two experts could not assist you. I work on these vehicles on a regular basis, perhaps I can shed some light for you.
Starting in 2007, the Transmitters can be programmed through the Driver Information Center (DIC). However, starting in 2008, they started to take that feature away and only make it available with the factory Scantool.
To see if you can still do it through the DIC, locate the 4 DIC buttons
Turn the ignition key "ON"
Press the "I" button (second one down) and scroll through until you find "Relearn Remote Key" and then press and hold the "Check" button (bottom button) until it says "Active" in the DIC
Then, Press and hold "Lock" and "Unlock" on the transmitter until you hear a beep and then press and hold the same buttons on the next transmitter until you hear a beep and do the same for any other transmitters.
Once done, simply turn the ignition key off to end the programming.