Usually means the chip in the key has failed, or the sensor in the key lock. Have you tried a spare key ?
SOURCE: when i turn the key it says starting disabled remove key
your alarm system was triped and needs to be reset try disconecting battery for 30 mins and reattach and try to start it againg
SOURCE: My 1990 Cadillac Deville wont start or engage starter
hey there. my name is dwayne, and im contacting you for help on my 98 caddy deville. well three days ago. i got a alarm installed. and friday i was driving on da high way and it just turned off. and smoke started coming from my steering wheel. engines coolant temp. was only 200 no smoke was coming from engine. now car wont start at all.!! please help
SOURCE: 97 cadillac deville starting disabled car will not restart.
Like they say, "Cadillacs are easy to break into, but hard to steal!"
SOURCE: 98 deville can't start key disabled
1-insert and remove key from ignition two times
2-close and open driver door two times
3-insert and remove key once from ign.
4-close and open drvr door twice
5-insert key into ign.,then close driver door
6-turn key to on (not start) then off, twice this is rewrite mode,have all remotes to reprogram it will clear any lost remotes.
7-remove key from ignition,the door locks should cycle twice.if not start over.it may take a few tries.
8-press lock/unlock together and hold for a second
9-release,and press lock on remote,the door locks will cycle
confirming program.continue to do other remotes you have,steps 8 and
9.if only one in possession,you are done. To end mode open door or insert key into ignition.
You'll need to follow the steps with no more than a 1-2 second delay between each step.. hope it works
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