Apparatus for vehicle-to-X communication, wherein the apparatus is configured to be installed in a vehicle, comprising: - a computing device (10-2) for processing information received by means of vehicle-to-X communication via an antenna (10-3) of the apparatus and transmitted from the antenna (10-3) to the computing device (10-2) by means of an input path, and - an output path for transmitting information to be emitted by means of the antenna (10-3), characterized in that the apparatus is configured to generate signals for simulating information received by means of vehicle-to-X communication using a second computing device (10-1) and to supply the generated signals to the input path of the apparatus via the output path for processing by the computing device (10-2), wherein the apparatus also comprises: - a first switching device (S1) which is included on a signal transmission path between the output path and the input path and, in the closed state, is configured to supply the generated signals to the input path of the apparatus for processing by the computing device (10-2), and - a second switching device (S2) having three switching states, which is configured to connect the antenna (10-3) to the computing device (10-2) in a first switching state, to connect the antenna (10-3) to the second computing device (10-1) in a second switching state, and to connect the antenna (10-3) neither to the computing device (10-2) nor to the second computing device (10-1) in a third switching state. - a computing device (10-2) for processing information received by means of vehicle-to-X communication via an antenna (10-3) of the apparatus and transmitted from the antenna (10-3) to the computing device (10-2) by means of an input path, and - an output path for transmitting information to be emitted by means of the antenna (10-3), characterized in that the apparatus is configured to generate signals for simulating information received by means of vehicle-to-X communication using a second computing device (10-1) and to supply the generated signals to the input path of the apparatus via the output path for processing by the computing device (10-2), wherein the apparatus also comprises: - a first switching device (S1) which is included on a signal transmission path between the output path and the input path and, in the closed state, is configured to supply the generated signals to the input path of the apparatus for processing by the computing device (10-2), and - a second switching device (S2) having three switching states, which is configured to connect the antenna (10-3) to the computing device (10-2) in a first switching state, to connect the antenna (10-3) to the second computing device (10-1) in a second switching state, and to connect the antenna (10-3) neither to the computing device (10-2) nor to the second computing device (10-1) in a third switching state. - a first switching device (S1) which is included on a signal transmission path between the output path and the input path and, in the closed state, is configured to supply the generated signals to the input path of the apparatus for processing by the computing device (10-2), and - a second switching device (S2) having three switching states, which is configured to connect the antenna (10-3) to the computing device (10-2) in a first switching state, to connect the antenna (10-3) to the second computing device (10-1) in a second switching state, and to connect the antenna (10-3) neither to the computing device (10-2) nor to the second computing device (10-1) in a third switching state. <EOS>