2003 GMC Envoy Owner's Manual - Page 50

If a -.4TC --type child restraint isn't attached to its anchorage points, the restraint won't be able to protect the child correctly.In a crash, the child could be seriously injured or killed. Make sure that a LATCH-type child restraint is properly installed using the anchorage points, or use the vehicle's safety belts to secure the restraint. See "Securing a Child Restraint Designed for the LATCH System" or "Securing a Child Restraint in a Rear Outside Seat Position" in the Index for information on how to secure a child restraint in your vehicle. ~ With this system, use the LATCH system instead of the vehicle's safety belts to secure a child restraint. See Securing a Child Restraint in a Rear Outside Seat Position on page 1-44. 1-43