Cadillac 1998 Seville Owner's Manual page 118

Programming the Transmitter
Do
not use the universal transmitter with any garage
door opener that does not have the "stop and reverse"
safety feature. This includes any garage door opener
model manufactured before April 1, 1982.
Be sure that people and objects are clear of the garage
door you are programming.
Turn the ignition off while programming the transmitter.
Follow these steps to program up to three channels:
1.
2.
3.
If you have previously programmed a transmitter
channel, proceed to Step 2. Otherwise, hold down
the two outside buttons on the universal transmitter
until the light on the transmitter begins to flash
rapidly (approximately 20 seconds). Then release the
buttons. This procedure initializes the memory and
erases any previous settings for all three channels.
Decide which one of the three channels you want
to program.
Hold the end of the hand-held transmitter against the
front surface of the universal transmitter so that you
can still see the amber light.
4. Using both hands, press the hand-held transmitter
button and the desired button on the universal
transmitter. Continue to press both buttons through
Step 5.
5. Hold down both buttons until you see the light on
the universal transmitter flash slowly and then
rapidly. The rapid flashing, which could take up to
90 seconds, 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
hand-held transmitter is not dead. 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 Safety Standards. If you cannot
program the transmitter after repeated attempts, consult
your dealer.