Hyundai Matrix Car Alarm System

Hi there,
I am having problem with my Hyundai Matrix 2005 (LaVita).
Problem arise after battery changed. The "control unit and the fobs is out of sync".
Means that my fob (transmitter) does not transmit any "Lock/Unlock" command.

Will anyone please detail me the step/s to rectify this problem.
Tried few procedures but doesn't work.
Thanking you in advance
Regards