GMC 2002 Yukon XL Owner's Manual page 59

Third Row Seat
2. Place the guide over the belt and insert the two edges
of the belt into the slots of the guide.
1. For the second row, remove the guide from its
storage clip on the trim panel near the side of the
seatback. For the third row, remove the guide from
its storage clip on the side of the seatback.
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