Cadillac 2007 XLR Owner's Manual page 116

Programming Universal Home
Remote — Rolling Code
Rolling code garage door openers are used for
garage doors produced after 1996 and are
code protected. Rolling code means the coded
signal is changed every time your remote control
garage door opener is used.
Programming a rolling code garage door opener
involves time-sensitive actions, so read the
entire procedure before you begin. If you do not
follow these actions, the device will time out
and you will have to repeat the procedure.
Follow these steps to program up to three
channels:
1. Press the two outside buttons at the same
time for one to two seconds, and immediately
release them.
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2. Go to the garage. Locate the garage door
motor head and press and release the
"learn" button.
After pressing the "learn" button, you
have 10 to 30 seconds to complete Step 4
depending on your garage control unit. If you
cannot locate the "learn" button, refer to
the owners guide for your garage door opener.