What do the Lights mean? Here is your quick guide to the lights and alerts: Related articles I received a low battery alert. When should I change my batteries? The keypad is not lit up. What do I do? How can I set up PIN codes on the keypad? There are two cables but the installation only asks for one to be used. What is the other cable for? The batteries have gone flat and I don’t have the spare key. How can I get in?