1995 Buick Riviera Owner's Manual - Page 61

Programmable Automatic DoorLocks (Option) Close your doors and turn on the ignition. Every time you moveyour shift lever out of PARK (P) all of the doors will lock. And, every time you stop and move your shift lever into PARK (P), your doors will unlock. If someone needs to get out while you're not in PARK (P),have that person use the manual or power lock. Whenthe door is closed again,it will not lock automatically. Just use the manualor power lock to lock the door again. 2-4