GMC Yukon Denalid Owner's Manual page 138

It is possible for the PASS-Key
to "learn" the transponder value of a new
or replacement key. Up to nine additional 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
to have keys made and programmed to the
system.
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 additional key do the
following:
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
OFF, and remove the key.
138
®
III+ decoder
®
III+
1
stamped on it.
4. Insert the new key to be programmed
and turn it to the RUN position within
five seconds of removing the original key.
5. The security light will turn off once the key
has been programmed.
6. Repeat Steps 1 through 5 if additional keys
are to be programmed.
If you are driving and the security light comes on
and stays on, you may be able to restart your
engine. Your PASS-Key
may not be working properly and must be serviced
by your dealer.
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.
®
III+ system, however,
®
III+ key,