GMC 2002 Sierra - Manual (Page 64)

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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.
With this system, use the LATCH system instead of the
vehicle’s safety belts to secure a child restraint.