Cadillac 2011 DTS Owner's Manual page 125

The security light will come on if there is a problem with
arming or disarming the theft-deterrent system.
®
When the PASS-Key III+ system senses that someone
is using the wrong key, it prevents the vehicle from
starting. Anyone using a trial-and-error method to start
the vehicle will be discouraged because of the high
number of electrical key codes.
If the engine does not start and the security light comes
on when trying to start the vehicle, there may be a
problem with your theft-deterrent system. Turn the
ignition off and try again.
If the engine still does not start, and the key appears to
be undamaged, try another ignition key. At this time,
you may also want to check the fuse, see Fuses and
Circuit Breakers on page 6 104. If the engine still does
not start with the other key, your vehicle needs service.
If your vehicle does start, the first key may be faulty.
See your dealer who can service the PASS-Key
have a new key made. In an emergency, contact
Roadside Assistance.
It is possible for the PASS-Key
the transponder value of a new or replacement key. Up
to 10 keys may be programmed for the vehicle. The
following procedure is for programming additional keys
only. If all the currently programmed keys are lost or do
not operate, you must see your dealer or a locksmith
who can service PASS-Key
and programmed to the system.
®
III+ to
®
III+ decoder to learn
®
III+ to have keys made
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
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.
®
III+ key,
3-21