Searched ebay for the FCC ID on the back of my factory fob. For my car it was GOH-M24 like in the following link.
http://www.ebay.com/itm/Replacement...ash=item20d05fb346:g:WuMAAMXQTghRJo0d&vxp=mtr
I used the following steps to program, but it may vary depending on year.
1 step -Open the drivers door (gotta remain open) and interior/dome light on (main light)
2 step - Turn the ignition switch to the 'on' or 'ignition' position (DO NOT START engine)
3 step - Press and hold the emergency override button (small red button on left side of steering wheel), around by the 14th second, the horn will sound 3 times. {This indicates that the unit has entered the transmitter programming mode.................KEEP HOLDING THE OVERRIDE BUTTON}
4 step - Press the lock/arm button on the remote (the remote being programmed) The horn will sound once, indicating that the system has learned that remote.
5 step - repeat step 4 for either same remote or add'l remotes (the fac system must acknowledge 4 memory lots , hence the possibility to program 4 remotes.)
6 step - Turn the ign switch to off position and release the override button