GMC Yukon Owner's Manual page 109

The pegs inside the compartment door are used to make
sure the button on the compartment door will contact the
control button o n the garage door opener.
..<'..I
.
Add one peg at a time
until the PUSH button on
the closed compartment
door operates the garage
door opener.
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.
Ad-just the position of the garage door opener and
add or remove pegs, as needed, until the opener
operates properly.
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