2006 GMC Yukon Owner's Manual - Page 47

Lap Belt When you sit in a center seating position, other than in the second row, you have a lap belt. To make the belt shorter, pull its free end as shown until the belt is snug. Buckle, position and release it the same way as the lap part of a lap-shoulder belt. If the belt is not long enough, see Safety Belt Extender on page 1-46. Make sure the release button on the buckle is positioned so you would be able to unbuckle the safety belt quickly if you ever had to. A lap safety belt does not have a retractor. To make the belt longer, tilt the latch plate and pull it along the belt. 1-41