The actuator is what I was concerned about. I didn't know if that was required or not? Is an actuator just another word for a solenoid?? I looked at some of the keyless units advertised, but I didn't notice any actuators with them. Also, on a 240D will the trunk lock and unlock, as well, by the driver's side door? Actually, my reason for doing this is because, I got locked out of a 240 in an ice storm once. I had to find a heat gun to be able to open up the door...