Not sure if this will work but you can try this:

Up to four transmitters can be programmed. When programming a new transmitter, all transmitters intended for use with this vehicle, 
except the transmitter used to start the programming mode, must be programmed within the 30-second programming mode. 

To program a transmitter, turn the ignition switch to the ON position with the vehicle stopped. 

Press and hold the unlock button on a currentlt programmed transmitter for a minimum of four seconds and a maximum of ten seconds. 

While pressing the unlock button, press and release the panic button. 

Release the unlock button and a single chime will sound. This indicates that the module is in programming mode. 

Within thirty seconds, press and release the lock or unlock button on all transmitters intended for use with this vehicle 

except the transmitter used to start the programming mode. 

Successful programming will be indicated by a single chime.


NOTE: 

When programming mode is entered, programming is cleared from programmed transmitters and the transmitters will need to be reprogrammed.