GMC 1997 Suburban Owner's Manual page 123

4. Add one peg at a time
until the
PUSH
button
on the closed
compartment door
operates the garage
I
door
Opener-
5. Now, with the
compartment door closed,
push the button marked
PUSH 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 push the PUSH button slightly to operate
the opener.
i. Adjust the position of the garage door opener and
add or remove pegs, as needed, until the opener
operates properly.