Abstract: The present invention relates to a supporting module for vehicle doors and a mounting procedure for said module, wherein said module incorporates the usual functional elements provided in vehicle doors and is meant to facilitate the mounting tasks. It incorporates an element meant to provide a sealing by covering one of the main openings of the inner plate of the door box, thereby separating the wet area and the dry area of the vehicle. The special configuration of the module and the openings of the inner plate of the door box facilitate the mounting and removal tasks of the module and the elements incorporated on the door, as well as the establishment of a sealing. In addition, the module is freed of all structural responsibilities.