to program the homelink you have to take a transmitter that already works and hold the button, near the buttons for the homelink, then hold one of the buttons for the homelink for a few seconds. then it should work.
thats at least how it worked in my nissan pathfinder.

hopefully this helped

 

cool, thanks.... the Homelink system is made by one company, then car companies buy it and put it in their cars... so they all should program the same.