Buick 2003 LeSabre Owner's Manual page 116

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.
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.
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.
Erasing HomeLink@ Buttons
To erase programming from the three buttons do the
following:
1. Press and hold down the two outside buttons until
the indicator light begins to flash, after 20 seconds.
2. Release both buttons. Do not hold for longer than
30 seconds.
HomeLink@ is now in the train (learning) mode and
can be programmed at any time beginning with Step 2
under "Programming HomeLink@."
Individual buttons can not be erased, but they can be
reprogrammed. See "Reprogramming a Single
HomeLink@ Button" next.
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