Chevrolet 1997 Monte Carlo Owner's Manual page 63

Door Locks
-
Unlocked doors can be dangerous.
Passengers
--
especially children
--
can easily
open the doors and fall out. When a door is
locked, the inside handle won't open it.
Outsiders can easily enter through an unlocked
door when you slow down or stop your vehicle.
This may not be
so
obvious: You increase the
chance of being thrown out of the vehicle in a
crash if the doors aren't locked. Wear safety belts
properly, lock your doors, and you will be far
better off whenever you drive your vehicle.
'
There are several ways to lock and unlock your vehicle.
From the outside, use your door key or remote keyless
entry transmitter if your vehicle has this option.
From the inside, push the lever to lock the door
manually. To unlock, pull the lever.
Power Door Locks
Press the power door lock switch to lock or unlock
both doors.