1995 Buick Century Owner's Manual - Page 61
1995 Buick Century Manual
Page 61 highlights
Door Locks 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: To lock the door, slide the lock control on the door rearward. To unlock the door, slide the lock control forward. 2-3