2001 Chevrolet Impala Owner's Manual - Page 141

Canadian Programming: During programming, your hand-held transmitter may automatically stop transmitting. Continue to press and hold the HomeLink button while you press your hand-held transmitter button every two seconds until the HomeLink Transmitter has been programmed. The indicator light will flash slowly and then rapidly after several seconds once it has been successfully programmed. If you have trouble programming the HomeLink Transmitter, make sure that you have followed the directions exactly as described and that the battery in the hand-held transmitter is not dead. If you still cannot program it, flip the hand-held transmitter end over end and try again. The HomeLink Transmitter may not work with older garage door openers that do not meet current Federal Consumer Safety Standards. If you cannot program the transmitter after repeated attempts, consult your dealer. Be sure to keep the original hand-held transmitter in case you need to erase and reprogram the HomeLink Transmitter. Operating the Transmitter Press and hold the appropriate button on the HomeLinkR Transmitter. The house symbol comes on while the signal is being transmitted. The effective transmission range of the HomeLink Transmitter may differ from the hand-held transmitter and from one channel to another. 2-71