Voyager 97 keyless entry don't work

Hi All,

I just remove the after market alarm that the dealer installed when I bought my Van, because it is causing a problem on not strating and so on. I took all the electrical wiring out that comes with the alarm. Now that everthing is back to normal, I would like to just use the keyless entry keypad that comes with the Van. But it doen't work anymore. Is there anyway to reset or re program this keyless entry keypad?

Thanks in advance.