GMC YUKON DENALI 2000 Manual page 48

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.
1-36
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. Slide the guide onto the storage clip.
Make sure you remove the comfort guide from the belt
before you fold a rear seat down.