2005 Buick Rendezvous Owner's Manual - Page 127

8. Return to the vehicle. Firmly press and hold the programmed HomeLink® button for two seconds, then release. Repeat the press/hold/release sequence a second time, and depending on the brand of the garage door opener (or other rolling code device), repeat this sequence a third time to complete the programming. HomeLink® should now activate your rolling-code equipped device. To program the remaining two HomeLink® buttons, begin with Step 2 of "Programming HomeLink®." You do not want to repeat step 1, as this will erase all previous programming. If you live in Canada, or you are having difficulty programming a gate operator by using the "Programming HomeLink® " procedures (regardless of where you live), replace Step 3 under "Programming HomeLink® " with the following: Continue to press and hold the HomeLink® button while you press and release every two seconds (cycle) your hand-held transmitter until the frequency signal has been successfully accepted by HomeLink®. The indicator light will flash slowly at first and then rapidly. Proceed with Step 4 under "Programming HomeLink® " to complete. Using HomeLink® Press and hold the appropriate HomeLink® button for at least half of a second. The indicator light will come on while the signal is being transmitted. Gate Operator and Canadian Programming Canadian radio-frequency laws require transmitter signals to "time out" or quit after several seconds of transmission. This may not be long enough for HomeLink® to pick up the signal during programming. Similarly, some U.S. gate operators are manufactured to "time out" in the same manner. 2-37