Cadillac 1995 sedan deville Owner's Manual page 92

c
The ignition key must
be
clear1 and dry before it's inserted in the ignition
or the engine may not start. If the engine does not start and the
STARTING DISABLED DUE TO fHEFT SYSTEM REMOVE
1GNITION KEY
message
is displayed, the kcy mag be dirty or wet. Turn
the ignition off.