1993 Cadillac DeVille Owner's Manual - Page 76

Rear Door Security Lock Your Cadillac is equipped with rear door security locks that helpprevent of passengers from opening the rear doors your car from the inside. To _- one of these locks: use 1. Move the lever on r: the door all the way down. f I I SET LEVER O N OTHER REAR DOOR ALSO. - 2. Close the door. 3. Do the same thing to the otherrear door lock.