GMC 2007 Envoy - Manual (Page 38)

To unlatch the belt, push the button on the buckle.
Rear Safety Belt Comfort Guides
Rear shoulder belt comfort guides may provide
added safety belt comfort for older children
who have outgrown booster seats and for some
adults. When installed on a shoulder belt, the
comfort guide positions the belt away from
the neck and head.
There is one guide for each outside passenger
position in the rear seat. Here is how to install the
comfort guide to the shoulder belt:
1. Slide the guide off of its storage clip located
between the interior body and the seatback.
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