try this mate i had this when i had a vreg ghia

To teach a remote control the following procedure will need to be followed. It's quite simple and Iā€™m sure with a little practice you will be able to do it with your eyes shut!!

For the ignition switch Accessory is (Pos I) and On is (Pos II)

Insert a key into the ignition and cycle from (Pos I) to (PosII) and back to (Pos I), 4 times within about 3 seconds. I know the Ford literature says 6 seconds but I have found this to be a more reliable method.

If you have successfully entered learning mode a chime should be heard. On Focus do not expect the clock LED to flash. You now have about 30 seconds to complete the following step(s).
Now press any button on the remote control. If the learning was successful then a further chime will be heard. Repeat only this step for any additional remotes that you wish to teach to the vehicle.
Once you have taught all the remotes you can exit learning mode and try them by one of two methods. Either wait 30 seconds or cycle the ignition key to On then Off once.