2003 GMC Sierra 1500 Pickup Owner's Manual - Page 53

Rear Seat Top Strap Anchors (Crew Cab Models) Lower Anchorages and Top Tethers for Children (LATCH System) Your vehicle may have the LATCH system. If it does, you'll find anchors (A) in the seat, where the seatback meets the seat cushion. For front passenger seat positions, there is an anchor behind and to the bottom of the seat to secure the top strap. For rear center seat positions, there is an anchor near the driver's side rear seat head restraint. To assist you in locating the lower anchors for this child restraint system, each seating position with the LATCH system will have a visible metal anchor point in the seat where the seatback meets the seat cushion. If your 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. There are also anchorage points at the rear base o the f front passenger's seat. 1-46