1998 Chevrolet Blazer Owner's Manual - Page 136

If you havetrouble programming the universal transmitter, makesure that you havefollowed the directions exactly as described and thatthe battery in the hand-held transmitter is notdead. If you still cannot program it, rotate the hand-held transmitter end over end and try again. The universal transmitter may not work with older garage door openers that do not meet current Federal Consumer SafetyStandards. If you cannot program the transmitter after repeated attempts, consult your GM dealer. Be sure to keep the original hand-held transmitter in case you need toerase and reprogramthe universal transmitter. Training a Garage Opener with a "Rolling If you programmed the universal transmitter, but the garage door will not open, and if your garage door opener was manufactured after 1995, your garage door may have a security feature that changes the "code" of your garage door opener every time it is opened or closed. To determine if your garage door opener has this "rolling code" feature, press the appropriate button on the universal transmitterthat was programmed.If the red light flashes rapidly for one to two seconds, then turns solid, your garage door opener has this feature. To program a garage dooropener with the rollingcode feature, do the following: 1. Program your hand-held transmitter to the universal transmitter by following the steps provided under in "Programming the Transmitte?' earlier this section. Operating the Transmitter Press and hold the appropriate button on the universal transmitter. The red light comes on while the signal is being transmitted. Note that the effective transmission range of the universal transmitter may differ from the hand-held transmitter and fromone channel to another. 2. Remove the cover panel from the garage door opener receiver. It is located near the garage door opener motor. 3. Locate the training button on the garage opener door receiver. The exact location and color will vary among brands. 2-62