GMC 2001 Envoy - Manual (Page 48)

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3. Be sure that the belt is not twisted and it lies flat.
The elastic cord must be under the belt and the
guide on top.
4. Buckle, position and release the safety belt as
described in “Rear Seat Outside Passenger Positions”
earlier in this section. Make sure that the shoulder
belt crosses the shoulder.
To remove and store the comfort guides, squeeze the
belt edges together so that you can take them out from
the guides. Pull the guide upward to expose its storage
clip, and then slide the guide onto the clip. Turn the
guide and clip inward and in between the seatback and
the interior body, leaving only the loop of the elastic
cord exposed.