Abstract: A sidewall module of a motor vehicle in which a mounting beam which can be attached to the vehicle is preassembled with a self-supporting sidewall, and additional components may be installed in the sidewall module prior to assembly of the module on the vehicle. This approach to vehicle assembly creates a sidewall module that makes it possible to effectively utilize the construction space between the sidewall and the wheel house. Preferably, the mounting beam and the side wall are made of plastics, and the sidewall module is mounted on vehicle support structure arranged to permit the sidewall module to absorb energy in a collision with a pedestrian.