GMC 2002 Sierra - Manual (Page 69)

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Securing a Child Restraint in the Center
Front Seat Position
Don’t use child restraints in this position. The restraints
won’t work properly.
Securing a Child Restraint in the Center
Rear Seat Position (Extended Cab and
Crew Cab)
If you have an extended cab or a Crew Cab pickup, you
can secure a child restraint in the center rear seat position.