GMC 2000 Sierra - Manual (Page 141)

yellow blue
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4. Add one peg at a time
until the PUSH button
on the compartment
door will operate the
garage door opener, with
the compartment door
closed, when you
press the button
marked PUSH.
5. Now, with the
compartment door
closed, press the button
marked PUSH again to
make sure the garage
door opener
operates properly.
With the garage door opener positioned properly and the
right number of pegs in place, you should only have to
press the PUSH button slightly to operate the opener.
6. Adjust the position of the garage door opener and
add or remove pegs, as needed, until the opener
operates properly.