1997 Cadillac Eldorado Owner's Manual - Page 125

Be sure to keep the original hand-heldtransmitter in case you need to erase and reprogram the universal transmitter. Note to Canadian Owners: During programming, the hand-held transmitter may stop transmitting after one or two seconds. If you areprogramming from one of these transmitters, you should press and re-press button the on the hand-held transmitter every two seconds without ever releasing the button on the universal transmitter. Release both buttons when the red on the universal light transmitter begins to flash rapidly. Note thatthe universal transmitter is disabled whenthe VALET button inside the glove boxis activated. For more information, see "Security Override"earlier in this section. Also note that if the hand-held transmitter appears to program the universal transmitter but does notopen your garage door, if the garage door openerwas and manufactured after 1995, the garage door opener may have a "rolling code" system. A rolling codesystem of every time changes the code the garage door opener you open or close the garage door. Press and hold the appropriate button the universal on transmitter. The red lightcomes on while the signalis being transmitted. To determine if you have this system, press the button on the universal transmitter that you have programmed already. If the red light on the universal transmitter flashes rapidlyfor one or two seconds and then stops flashing, the garage door openerhas a rolling code system.