GMC 2003 Yukon Owner's Manual page 72

To remove the child restraint, just unbuckle the vehicle's
safety belt. It will be ready to work for an adult or
larger child passenger.
Securing a Child Restraint in the
Center Front Seat Position
Don't use child restraints in this position. The restraints
won't work properly.
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Securing a Child Restraint in the
Right Front Seat Position