The module has a reflector (1) providing a low luminous beam from a code lamp (L), and a city lamp (5) situated below a horizontal plane passing via an optical axis (2). A collar (6) has reflection faces (7a) and is arranged near an upper edge of the reflector in a zone opposite to the city lamp, where the collar is hidden by an edge of a mask (3) to the eyes of an observer. Each reflection face is predicted and oriented for reflecting a part of luminous flow emitted by the city lamp following a specified direction forming an angle with the axis.