My power locks have suddenly stoped working. One day they just wouldn't work. I checked the fuse in the engine bay and its good. I have an aftermarket alarm that was hooked up to the power locks and when i set the alarm the doors don't lock. when i try to lock them while i'm in the car i.e. driving, it doesn't work. Even when i use my key to lock the driver side door, all the others would lock as well and now it doesn't. Any suggestions on what to check?