GMC ENVOY XL 2004 Owner's Manual page 33

Style 2
1. An elastic cord with a hook end is located in a
pocket on the side of the seatback. Remove the
guide from its pocket.
2. Align the sliding comfort guide, located on the
shoulder belt, with the hook. Attach the hook to
the loop on the sliding comfort guide.
3. Adjust the cord length so that the belt is between
the shoulder and neck.
3.1. Squeeze and hold the ends of the lock (A)
on the elastic cord.
3.2. Pull the loop to shorten the guide or pull the
cord to lengthen the guide.
3.3. Release the lock.
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