Chevrolet 2003 Avalanche Owner's Manual page 33

Rear Seat Passengers
It's very important for rear seat passengers to buckle
up! Accident statistics show that unbeited 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.
Rear Seat Outside Passenger Positions
The positions next to the windows have lap-shoulder
belts.
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