2003 GMC Sonoma Owner's Manual - Page 33

Rear Seat Passengers (Extended Cab Jump Seat) Lap Belt This is a reserve seating position equipped with a lap belt. It's very important for rear seat passengers to buckle up! Accident statistics show that unbelted people in the rear seat are hurt more often in crashes than those who are wearing safety belts. Rear passengers who aren't safety belted can be thrown out of the vehicle in a crash. And they can strike others in the vehicle who are wearing safety belts. The jump seat has a lap belt with no retractor. To make the belt longer, tilt the latch plate and pull it along the belt. 1-26