Note: Up to 4 one-way transmitters can be programmed to operate the system. Any previously stored transmitter codes will be erased if they are not programmed within the following sequence. To program the transmitter(s): 1. Turn on the ignition key On, Off, On, Off, and back On. (Key On 3 times) The siren will chirp 3 times. 2. Press and hold the Override switch for 5 seconds. The siren will chirp 5 times. The LED will illuminate. 3. Press Button 1 on the first transmitter. The siren will chirp once. 4. Press Button 1 on the first transmitter again. The siren will chirp twice to indicate it has learned the code. 5. Repeat steps 3 for each additional transmitter (up to 4). 6. Turn off the ignition key.