Central Door Unlocking System; Power Door Locks - Pontiac 2005 Bonneville Owner's Manual

To lock the door from the inside, push the manual door
lock forward. To unlock the door, push the manual
door lock rearward.

Central Door Unlocking System

If your vehicle has a theft-deterrent system, all doors
will unlock if the key is held in the outside key cylinder
unlock position for more than two seconds. The
doors will also unlock if the key is turned to the unlock
position twice in three seconds.
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Power Door Locks

Press the bottom of the switch to lock all the doors.
Press the top of the switch to unlock all doors.
You can lock or unlock all
the doors on your vehicle
using the driver's or
front passenger's door
lock switch.