I am in the process of upgrading my central locking to keyless entry and remote start with a bulldog security unit as we speak. One of the things that you might check in addition to your relay is the wiring going to the door lock and to the drivers door plunger. The insulation has a tendency to deteriorate just like some engine wiring harnesses. I have repaired these in the past using liquid electrical tape. Also, in case you didn't know, you can install an actuator from one of the other doors into your drivers door. This is necessary when upgrading to a keyless entry setup. I installed one from a passenger door I got from one of my parts cars. All I had to do was to switch the mounting bracket to the opposite side. There are holes in the actuator for this. Also, there are holes in your drivers door for this actuator to be mounted and you will need the door plunger rod from your donor cars also. Now it looks like it was made that way. An easy plug-n-play. You will of course remove the original drivers door plunger/lock actuator as these will be replaced with the new plunger rod. Good Luck!