Cadillac 2011 DTS Owner's Manual page 123

See your dealer or a locksmith who can service
PASS-Key III+ to get a new key blank that is cut
exactly as the ignition key that operates the system.
To program the new key:
1. Verify that the new key has a
2. Insert the original, already programmed, key in the
ignition and start the engine. If the engine will not
start, see your dealer for service.
3. After the engine has started, turn the key to LOCK/
OFF, and remove the key.
4. Insert the new key to be programmed and turn it to
the ON/RUN position within five seconds of turning
the original key to LOCK/OFF.
The security light will turn off once the key has
been programmed.
5. Repeat Steps 1 through 4 if additional keys are to
be programmed.
If you lose or damage your PASS-Key III+ key, see your
dealer or a locksmith who can service PASS-Key III+ to
have a new key made.
Do not leave the key or device that disarms or
deactivates the theft-deterrent system in the vehicle.
stamped on it.
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