Luminous module (300, 400) for an automotive vehicle, comprising an assembly comprising a flexible printed circuit board (320, 420) accommodating an electronic circuit, and at least one support plate (360, 460) electrically conductive, wherein the flexible board comprises: a first board section (330, 430) that bears on a first face (332, 432) at least one electronic component (333, 433) of the electronic circuit, and that makes contact, via a second face (334, 434) that is opposite the first face, with said support plate (360, 460) so that the first board section is rigidified, the flexible board comprising a second board section (340, 440) that comprises at least one electrically conductive track on a first face, and that is bounded by a single fold (350, 450) with respect to the first board section (330, 430), the fold being such that the second board section makes contact with said support plate (360, 460), characterized in that the luminous module comprises a metal device representing the mass, the assembly being arranged on a surface (312, 412) of a metal device (310, 410), in that the fold is such that the electrically conductive track forms a connection to ground, and in that the support plate (360, 460) comprises two parts which extend in planes generally parallel to the surface of the metal device (312, 412), comprising: - a first part (362, 462), a first face of which is in contact with the second face of the first board section and a second face of which, opposed to the first face, is in contact with the surface of metal device (312, 412), and - a second part (366, 466) in contact with the electrically conductive track of the fist face of the second board section (340, 440). an assembly comprising a flexible printed circuit board (320, 420) accommodating an electronic circuit, and at least one support plate (360, 460) electrically conductive, wherein the flexible board comprises: a first board section (330, 430) that bears on a first face (332, 432) at least one electronic component (333, 433) of the electronic circuit, and that makes contact, via a second face (334, 434) that is opposite the first face, with said support plate (360, 460) so that the first board section is rigidified, the flexible board comprising a second board section (340, 440) that comprises at least one electrically conductive track on a first face, and that is bounded by a single fold (350, 450) with respect to the first board section (330, 430), the fold being such that the second board section makes contact with said support plate (360, 460), characterized in that the luminous module comprises a metal device representing the mass, the assembly being arranged on a surface (312, 412) of a metal device (310, 410), in that the fold is such that the electrically conductive track forms a connection to ground, and in that the support plate (360, 460) comprises two parts which extend in planes generally parallel to the surface of the metal device (312, 412), comprising: - a first part (362, 462), a first face of which is in contact with the second face of the first board section and a second face of which, opposed to the first face, is in contact with the surface of metal device (312, 412), and - a second part (366, 466) in contact with the electrically conductive track of the fist face of the second board section (340, 440). a first board section (330, 430) that bears on a first face (332, 432) at least one electronic component (333, 433) of the electronic circuit, and that makes contact, via a second face (334, 434) that is opposite the first face, with said support plate (360, 460) so that the first board section is rigidified, the flexible board comprising a second board section (340, 440) that comprises at least one electrically conductive track on a first face, and that is bounded by a single fold (350, 450) with respect to the first board section (330, 430), the fold being such that the second board section makes contact with said support plate (360, 460), characterized in that the luminous module comprises a metal device representing the mass, the assembly being arranged on a surface (312, 412) of a metal device (310, 410), in that the fold is such that the electrically conductive track forms a connection to ground, and in that the support plate (360, 460) comprises two parts which extend in planes generally parallel to the surface of the metal device (312, 412), comprising: - a first part (362, 462), a first face of which is in contact with the second face of the first board section and a second face of which, opposed to the first face, is in contact with the surface of metal device (312, 412), and - a second part (366, 466) in contact with the electrically conductive track of the fist face of the second board section (340, 440). - a first part (362, 462), a first face of which is in contact with the second face of the first board section and a second face of which, opposed to the first face, is in contact with the surface of metal device (312, 412), and - a second part (366, 466) in contact with the electrically conductive track of the fist face of the second board section (340, 440).