GMC 1999 Envoy Owner's Manual page 120

4. Hold down both buttons until you see the red light
on the universal transmitter flash rapidly. The rapid
flashing indicates that the universal transmitter has
been programmed. Release both buttons once the
light starts to flash rapidly.
If you have trouble programming the universal
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, rotate the hand
and try again. The universal 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, refer to
"Training a Garage Door Opener with Rolling Codes"
later in this section or contact the manufacturer of the
- - -
unit at 1 800 355 3515.
Be sure to keep the original hand
you need to erase and reprogram the universal transmitter.
Note to Canadian Owners: During programming, the
-
hand held transmitter may automatically stop
transmitting after one or two seconds. In this case, you
-
should press and re press the button on the hand
transmitter every two seconds without ever releasing the
button on the universal transmitter. Release both buttons
when the indicator light on the universal transmitter
begins to flash rapidly.
2-60
-
held transmitter end over end
-
held transmitter in case
-
held
Operating the Transmitter
Press and hold the appropriate button on the universal
transmitter. The indicator light comes on while the
signal is being transmitted.
-
If the hand held transmitter appears to program the
universal transmitter but does not open your garage
door, and if the garage door opener was manufactured
after 1996, the garage door opener may have a "rolling
code" system. A rolling code system changes the code
of the garage door opener every time you open or close
the garage door.
To determine if you have this system, press the button
on the universal transmitter that you have programmed
already. If the indicator light flashes rapidly for one to
two seconds, then turns solid, the garage door opener
has a rolling code system. In a rolling code system, the
garage door motor head unit must be trained to the
universal transmitter.
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