Batterie is dead on the remote. if i change the batterie does it have to be reprogrammed

Could be, if the battery is bad you will need to reprogram your remote after you replace battery.

You should not have to reprogram the remote. The programming is stored in Non-volatile ram.

Change the battery in the remote, then reprogram the remote, {key fob}activator inside door making any sound? If so, the connection is working, just not sending the correct signal.

Key fob has a dead battery does the remote open an close side doors remote door lock work if not probably dead battery in remote also if battery was changed may have to reprogram remote system
that would have to be done by dealership they have to go into the program an relaern the remote

If you need further help, I’m available over the phone at https://www.6ya.com/expert/robert_c7b5aba9012a13b2

just replace your battery you have a central control module, that stays programmed, the only way you need to get it reprogrammed is if you take it out and put it in another car

you may have to get it reprogrammed at the dealership sometimes if the batteries were dead for to long then the remote loses its codes

You should not have to reprogram the remote if you are just changing the battery. I would first check to make sure you put the battery in correct side up. If that didn't work try disconnecting both terminals on your car battery for 10 minutes. Then reconnect them and try your key fob. This has worked for many people and I have no idea why.

Otherwise you can order a new Volkswagen key fob online at https://www.keylessentryremotefob.com/Volkswagen-Key-Fob-Remotes-s/1854.htm

WHEN YOU CHANGE THE BATTERY YOU HAVE TO REPROGRAM THE REMOTE TO THE OPENER

U will not have to re-prgram them just becuase of a battery change as long as they worked fine before the batteries went dead.

If you have the original remote, it does not need any reprogramming because the Sony code will be the first one even if you change the batteries.
Try pressing the TV key on it if you have the RM-Y185 remote, also try to move the switch to the AV1 position.