GMC 2002 Yukon XL Owner's Manual page 73

Lower Anchorages and Top Tethers for
Children (LATCH System) (If Equipped)
Your vehicle may have the LATCH system. If it does,
you'll find anchors (A) in the second row seats, where
the seatbacks meets the seat cushions.
To assist you in locating the lower anchors for this child
restraint system, each seating position with the LATCH
system will have a visible metal anchorage point in the
seat where the seatback meets the seat cushion.
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In order to use the system, you need either a
-
forward facing child restraint that has attaching
points (B) at its base and a top tether anchor (C), or a
-
rear facing child restraint that has attaching points (B),
as shown here.