Buick 1998 Century Owner's Manual page 81

Power Door Locks
Press the power door lock
switch to lock or unlock
all doors.
The rear doors do not have power door lock switches.
The lever on each rear door works only that door's lock.
It won't lock or unlock all the doors.
Lockout Protection Feature
This feature prevents a driver who has left the key in the
vehicle's ignition from locking the doors by using the
power door locks while any door is open. The feature
works by disabling the power door locks when a key is
in the ignition and any door is open.
You may override the Lockout Protection Feature by
holding the power door lock switch in the lock position
for more than three seconds while the key is in the
ignition and any door is open.
Remember, this feature can't guarantee that you'll never
be locked out of your vehicle. If you use the manual
door lock or if you don't leave the key in the ignition,
you could still lock your keys inside your vehicle.
Always remember to take your keys with you.
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