1996 GMC Suburban Owner's Manual - Page 45

/ When you sit in a center seating position, you have a lap safety belt, which has no retractor. To make the belt longer, tilt the latch plate and pull it along the belt. I To make the belt shorter, pull its freeend as shown until the beltis snug. Buckle, position and release it the same way as the lap part of a lap-shoulder belt.If the belt isn't long enough, see "Safety Belt Extender" at the end of this section. Make sure the release button on the buckle is positioned so you would be able tounbuckle the safety belt quickly if you ever had to. 1-37