Chevrolet 2002 TrailBlazer Owner's Manual page 58

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.
1-46
With this system, use the LATCH system instead of the
vehicle's safety belts to secure a child restraint.