A method for establishing a wireless network for a vehicle is provided herein. The vehicle comprises a tractor unit and a trailer. The tractor unit comprises at least one first station and a first control unit and the trailer comprises a second station and a second control unit. The method comprises supplying electrical energy to the second control unit. The method further comprises interconnecting the first control unit and the second control unit via a physical interface. The method further comprises generating a defined message by the second control unit and receiving the defined message by the first control unit via the physical interface. The method further comprises transmitting information required to establish the wireless network via the first station only when the defined message is present in the first station.