2008 GMC Sierra 1500 Pickup Owner's Manual - Page 126

Be sure to keep the original remote control transmitter for use in other vehicles, as well as, for future programming. You only need the original remote control transmitter for Fixed Code programming. It is also recommended that upon the sale or lease termination of the vehicle, the programmed buttons should be erased for security purposes. See "Erasing Universal Home Remote Buttons" later in this section. When programming a garage door, it is advised to park outside of the garage. Be sure that people and objects are clear of the garage door or security device you are programming. Programming a garage door opener involves time-sensitive actions, so read the entire procedure before you begin. If you do not follow these actions, the device will time out and you will have to repeat the procedure. To program up to three devices: Programming Universal Home Remote - Rolling Code If you have questions or need help programming the Universal Home Remote System, call 1-866-572-2728 or go to www.learcar2u.com. Most garage door openers sold after 1996 are Rolling Code units. 1. From inside the vehicle, press the two outside buttons at the same time for one to two seconds, and immediately release them. 2-50