How do you program the garage door opener on an 03 Yukon?

Answer 1

You should be able to find this information in your owner's manual, but if you do not have one, then you can try the following:

Homelink: Hold the button on the homelink system until it begins to blink. Then, while holding that button, hold the button on your garage door opener until the homelink button blinks faster. Next you will need to press and release the 'learn' button on the overhead garage door opener. Then, hold the button on the homelink you just programmed until the garage door closes. (Caution: If you press and hold the 'learn' button it will erase all of the codes programmed into the overhead unit.)