“In this instructable, i will show you how to build your very own Remote Controlled Central Locking system. There are a number of different central locking/alarm systems you can buy at your local automotive spare parts retailer, but by using a fancy one for a week, i quickly determined that there were too many problems with the module, making it not very convenient. Having to unlock the car uniquely with the remote was one of the major problems i had with it as i wanted to be able be unlock the car using the key as well as with the remote without any hassle. This instructable will cover the design procedure only and not the installation process as each vehicle is different.”