Pontiac 2004 Montana Owner's Manual page 101

Just like the other restraint systems in your vehicle, your
built-in child restraint needs to be periodically checked
and may need to have parts replaced after a crash. See
Checking Your Restraint Systems on page 1-106 and
Replacing Restraint System Parts After a Crash on
page 1-107.
5. Rotate the head restraint forward and push it all the
way down.
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