How can I fix the electronic central locking system in my Audi 80?

My Audi 80's electronic central locking system has suddenly stopped working. None of the doors can be locked or unlocked with the remote, and the buttons on the doors don't work either. What could be the problem and how can I fix it?

First, check the batteries in your remote to ensure it's not a simple issue of a dead battery. If that's not the problem, it could be an issue with the central locking control module. Try resetting it by disconnecting the car battery for a few minutes and then reconnecting it. If that doesn't work, you may need to replace the control module.