Cadillac 2008 DTS Owner's Manual page 132

Be sure to keep the original remote control transmitter for
use in other vehicles, as well as, for future programming.
You only need the original remote control transmitter for
Fixed Code programming. It is also recommended that
upon the sale or lease termination of the vehicle, the
programmed buttons should be erased for security
purposes. See "Erasing Universal Home Remote
Buttons" later in this section.
When programming a garage door, it is advised to
park outside of the garage. Be sure that people
and objects are clear of the garage door or security
device you are programming.
Programming Universal Home
Remote — Rolling Code
If you have questions or need help programming the
Universal Home Remote System, call 1-866-572-2728
or go to www.learcar2u.com.
Most garage door openers sold after 1996 are Rolling
Code units.
Programming a garage door opener involves
time-sensitive actions, so read the entire procedure
before you begin. If you do not follow these actions,
the device will time out and you will have to repeat the
procedure.
To program up to three devices:
1. From inside the vehicle, press the two outside
buttons at the same time for one to two seconds,
and immediately release them.
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