The gateway serves as the information bridge between various in-car communication networks. It also serves as the vehicle central diagnostic interface (It will allow you to install or uninstall the control units in the gateway). Mostly, the gateway has appeared in vehicles from 2005 manufacturing years. To access the function follow the instruction:
You will now see the displayed control units. The marked ones are currently installed in your vehicle and vice versa
Control units that are not installed in your vehicle
To Install/Uninstall need to Mark/Unmark the control units and apply by pressing
You can change the gateway by pressing "Change >"
Newer cars have the control units which do have the control units inside them.