I've had this problem for an very long time.No matter what,EMS and FD comes without lights and sirens.It really annoys me at this point.When it comes to LEO,they come without lights and siren,and when they arrive and exit vehicle,lights turn on,and it is only on code 2 backup,code 3 comes as normal.I have went and read the xml files of backup,there is no such an option that controls how backup responds.