2001 GMC Sierra 1500 Pickup Owner's Manual - Page 67

Rear Seat Top Strap Anchors (Crew Cab Models) When using a child restraint with a top strap in the center rear position, route the top strap through the fabric loop on the seatback. Then, raise the head restraint and attach the top strap to the anchor point located at the closest outboard position. Once you have the top strap anchored, you'll be ready to secure the child restraint itself. Tighten the top strap when and as the child restraint manufacturer's instructions say. If you vehicle is a crew cab model, you'll find top strap anchors for the rear seating positions located on the back panel of your vehicle, behind the rear seat. In order to get to the brackets, you'll have to remove the trim plugs covering them. 1-54