1997 Ford Aerostar Owner's Manual - Page 112

RWARNING Never let a passenger hold a child on his or her lap while the vehicle is moving. The passenger cannot protect the child from injury in a collision. RWARNING Lock the doors of your vehicle before driving to lessen the risk of the door coming open in a collision. Combination Lap and Shoulder Belts While your vehicle is in motion, the combination lap and shoulder belt adjusts to your movement. However, if you brake hard, turn hard, or if your vehicle receives an impact of 5 mph (8 km/h) or more, the lap/shoulder belt locks and helps reduce your forward movement. After you get into your vehicle, close the door and lock it. Then adjust the seat to the position that suits you best. Pull the combination lap/shoulder belt from the retractor so that the shoulder portion of the belt crosses your shoulder and chest. Be sure the belt is not twisted. If it is, remove the twist. Insert the belt tongue into the proper buckle until you hear a snap and feel it latch. Make sure the tongue is securely fastened to the buckle by pulling on tongue. 110