Cadillac 1994 DeVille Owners Literature page 83

Power Door Locks
Push the power door
lock switch to lock or
unlock all the doors at
once. The rear power
door lock switches
won't unlock any of
the doors -- that's a
safety feature.
Rear Door Security Lock
Your Cadillac is equipped with rear door security locks that help prevent
passengers from opening the rear doors of your car from the inside. To
use this lock,
1. Move the lever on the door all the way up to the ENGAGED position.
2. Close the door.
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