Overhead console garage door opener...

[Chevy-Art]

Here are some places to look at. I think it is called Homelink or DIC.
http://forum.gmtruckcentral.com/show...-and-Homelink?
http://www.gmtruckcentral.com/articles/GMT400DIC.html

[Chevy-Art]

And one more, post #31.
http://www.gmt400.com/forum/showthre...e-Thread/page4

[lil green]

Here are some places to look at. I think it is called Homelink or DIC.
http://forum.gmtruckcentral.com/show...-and-Homelink?
http://www.gmtruckcentral.com/articles/GMT400DIC.html

And one more, post #31.
http://www.gmt400.com/forum/showthre...e-Thread/page4

Thanks! These helped out a lot! Once I read these I had it programmed within like 2 minutes! I tried figuring it out before I saw your link and I was nowhere near close.